{"id":8605,"date":"2009-03-24T02:26:20","date_gmt":"2009-03-23T19:26:20","guid":{"rendered":"http:\/\/vafs.gov.vn\/vn\/2009\/03\/dac-diem-dat-trong-rung-tre-luong-dendrocalamus-membranaceus-munro-va-anh-huong-cua-cac-phuong-thuc-trong-rung-tre-luong-den-dat\/"},"modified":"2019-09-25T10:13:05","modified_gmt":"2019-09-25T03:13:05","slug":"dac-diem-dat-trong-rung-tre-luong-dendrocalamus-membranaceus-munro-va-anh-huong-cua-cac-phuong-thuc-trong-rung-tre-luong-den-dat","status":"publish","type":"post","link":"https:\/\/vafs.gov.vn\/vn\/dac-diem-dat-trong-rung-tre-luong-dendrocalamus-membranaceus-munro-va-anh-huong-cua-cac-phuong-thuc-trong-rung-tre-luong-den-dat\/","title":{"rendered":"\u0110\u1eb7c \u0111i\u1ec3m \u0111\u1ea5t tr\u1ed3ng r\u1eebng tre lu\u1ed3ng (Dendrocalamus membranaceus Munro)  v\u00e0 \u1ea3nh h\u01b0\u1edfng c\u1ee7a c\u00e1c ph\u01b0\u01a1ng th\u1ee9c tr\u1ed3ng r\u1eebng tre lu\u1ed3ng \u0111\u1ebfn \u0111\u1ea5t"},"content":{"rendered":"<p><strong><em>Nguy\u1ec5n Ng\u1ecdc B\u00ecnh<\/em><\/strong><\/p>\n<h1>Nguy\u00ean tr\u01b0\u1edfng b\u1ed9 m\u00f4n N\/C \u0111\u1ea5t r\u1eebng,<\/h1>\n<h1>Vi\u1ec7n KHLN Vi\u1ec7t Nam<\/h1>\n<p>R\u1eebng tre lu\u1ed3ng l\u00e0 m\u1ed9t lo\u1ea1i r\u1eebng kinh t\u1ebf s\u1edbm cho thu ho\u1ea1ch v\u00e0 cho thu nh\u1eadp th\u01b0\u1eddng xuy\u00ean t\u01b0\u01a1ng \u0111\u1ed1i cao, \u0111\u1ed3ng th\u1eddi c\u0169ng l\u00e0 lo\u1ea1i r\u1eebng c\u00f3 t\u00e1c d\u1ee5ng ph\u00f2ng h\u1ed9 gi\u1eef \u0111\u1ea5t gi\u1eef n\u01b0\u1edbc t\u1ed1t. Tre lu\u1ed3ng l\u00e0 lo\u00e0i c\u00e2y r\u1eebng nhi\u1ec7t \u0111\u1edbi \u01b0a \u1ea9m, c\u00f3 nhu c\u1ea7u cao v\u1ec1 c\u00e1c ch\u1ea5t kho\u00e1ng dinh d\u01b0\u1ee1ng, \u0111\u1eb7c bi\u1ec7t l\u00e0 \u0111\u1ea1m. \u0110\u1ea5t \u0111ai tuy kh\u00f4ng ph\u1ea3i l\u00e0 y\u1ebfu t\u1ed1 duy nh\u1ea5t c\u00f3 t\u00e1c d\u1ee5ng quy\u1ebft \u0111\u1ecbnh \u0111\u1ebfn n\u0103ng xu\u1ea5t c\u1ee7a r\u1eebng lu\u1ed3ng, nh\u01b0ng nghi\u00ean c\u1ee9u c\u00e1c \u0111\u1eb7c \u0111i\u1ec3m c\u1ee7a \u0111\u1ea5t tr\u1ed3ng r\u1eebng tre lu\u1ed3ng gi\u00fap cho vi\u1ec7c quy ho\u1ea1ch v\u00f9ng tr\u1ed3ng lu\u1ed3ng th\u00edch h\u1ee3p. M\u1eb7t kh\u00e1c, \u0111\u1ec3 n\u00e2ng cao t\u00e1c d\u1ee5ng ph\u00f2ng h\u1ed9 v\u00e0 hi\u1ec7u qu\u1ea3 kinh t\u1ebf r\u1eebng tre lu\u1ed3ng, nh\u1ea5t l\u00e0 \u0111\u1ea3m b\u1ea3o kinh doanh b\u1ec1n v\u1eefng th\u00ec c\u1ea7n ph\u1ea3i c\u00f3 ph\u01b0\u01a1ng th\u1ee9c tr\u1ed3ng th\u00edch h\u1ee3p.<\/p>\n<p>I. Ph\u01b0\u01a1ng ph\u00e1p nghi\u00ean c\u1ee9u<\/p>\n<p>1.1. Ph\u01b0\u01a1ng ph\u00e1p \u0111i\u1ec1u tra sinh th\u00e1i:<\/p>\n<p>Nghi\u00ean c\u1ee9u \u0111\u1ea5t d\u01b0\u1edbi r\u1eebng tre lu\u1ed3ng sinh tr\u01b0\u1edfng t\u1ed1t, x\u1ea5u kh\u00e1c nhau \u1edf c\u00e1c \u0111\u1ecba ph\u01b0\u01a1ng t\u1ea1i t\u1ec9nh Thanh Ho\u00e1. 8 \u00f4 nghi\u00ean c\u1ee9u r\u1eebng tre lu\u1ed3ng t\u1ed1t(t\u1eeb khi tr\u1ed3ng \u0111\u1ebfn khi r\u1eebng 6 tu\u1ed5i \u0111\u00e3 cho khai th\u00e1c c\u00e1c c\u00e2y lo\u1ea1i I, c\u00f3 \u0111\u01b0\u1eddng k\u00ednh th\u00e2n \u00b310cm), v\u00e0 10 \u00f4 nghi\u00ean c\u1ee9u r\u1eebng tre lu\u1ed3ng sinh tr\u01b0\u1edfng x\u1ea5u (r\u1eebng tr\u1ed3ng 6 tu\u1ed5i ch\u1ec9 cho tre lu\u1ed3ng lo\u1ea1i II v\u00e0 III, c\u00f3 \u0111\u01b0\u1eddng k\u00ednh th\u00e2n \u00a38cm).<\/p>\n<p>1.2.Ph\u01b0\u01a1ng ph\u00e1p \u0111\u1ecbnh v\u1ecb: X\u00e1c \u0111\u1ecbnh 2 \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u1ea5t t\u1ed1t v\u00e0 x\u1ea5u \u0111\u1ec3 tr\u1ed3ng r\u1eebng tre lu\u1ed3ng, v\u1edbi c\u00f9ng m\u1ed9t bi\u1ec7n ph\u00e1p k\u1ef9 thu\u1eadt tr\u1ed3ng gi\u1ed1ng nhau v\u00e0 theo d\u00f5i \u0111\u1ed9ng th\u00e1i c\u00e1c t\u00ednh ch\u1ea5t c\u1ee7a \u0111\u1ea5t, \u0111\u1eb7c bi\u1ec7t l\u00e0 ch\u1ebf \u0111\u1ed9 n\u01b0\u1edbc trong \u0111\u1ea5t v\u1edbi sinh tr\u01b0\u1edfng c\u1ee7a r\u1eebng tre lu\u1ed3ng.<\/p>\n<p>1.3.Ph\u01b0\u01a1ng ph\u00e1p tr\u1ed3ng c\u00e2y trong ch\u1eadu \u0111\u1ec3 nghi\u00ean c\u1ee9u ki\u1ec3m tra ch\u1eb7t ch\u1ebd h\u00e0m l\u01b0\u1ee3ng c\u00e1c ch\u1ea5t kho\u00e1ng dinh d\u01b0\u1ee1ng c\u00f3 trong \u0111\u1ea5t (\u0111\u1ea5t tr\u1ed3ng r\u1eebng tre lu\u1ed3ng t\u1ed1t v\u00e0 x\u1ea5u) v\u1edbi s\u1ef1 sinh tr\u01b0\u1edfng c\u1ee7a c\u00e2y tre lu\u1ed3ng trong giai \u0111o\u1ea1n nh\u1ecf.<\/p>\n<p>II. K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u<\/p>\n<h2><u>1. \u0110\u1eb7c \u0111i\u1ec3m \u0111\u1ea5t tr\u1ed3ng r\u1eebng tre lu\u1ed3ng<\/u><\/h2>\n<p><strong><em>1.1.T\u00ednh ch\u1ea5t v\u1eadt l\u00fd c\u1ee7a \u0111\u1ea5t<\/em><\/strong><\/p>\n<p>&#8211; \u0110\u1ed9 x\u1ed1p (%): \u0110\u1ea5t tr\u1ed3ng r\u1eebng tre lu\u1ed3ng sinh tr\u01b0\u1edfng t\u1ed1t, c\u00f3 \u0111\u1ed9 x\u1ed1p kh\u00e1 cao, t\u1eeb 53-68,5% (t\u1ea7ng \u0111\u1ea5t m\u1eb7t 0-10cm). \u0110\u1ea5t tr\u1ed3ng r\u1eebng tre lu\u1ed3ng sinh tr\u01b0\u1edfng x\u1ea5u, c\u00f3 \u0111\u1ed9 x\u1ed1p th\u1ea5p: 41-49%.<\/p>\n<p>&#8211; Kh\u1ea3 n\u0103ng th\u1ea5m n\u01b0\u1edbc c\u1ee7a \u0111\u1ea5t (mm\/ph\u00fat) \u1edf l\u1edbp \u0111\u1ea5t m\u1eb7t (0-5cm): N\u01a1i r\u1eebng tre lu\u1ed3ng sinh tr\u01b0\u1edfng t\u1ed1t, c\u00f3 t\u1ed1c \u0111\u1ed9 th\u1ea5m n\u01b0\u1edbc \u1edf t\u1ea7ng m\u1eb7t r\u1ea5t nhanh 5,5mm\/ph\u00fat. N\u01a1i \u0111\u1ea5t r\u1eebng tre lu\u1ed3ng sinh tr\u01b0\u1edfng x\u1ea5u c\u00f3 t\u1ed1c \u0111\u1ed9 th\u1ea5m n\u01b0\u1edbc \u1edf t\u1ea7ng m\u1eb7t r\u1ea5t k\u00e9m 0,9mm\/ph\u00fat.<\/p>\n<p>&#8211; H\u00e0m l\u01b0\u1ee3ng s\u00e9t v\u1eadt l\u00fd (%) (h\u1ea1t c\u00f3 \u0111\u01b0\u1eddng k\u00ednh 0,01mm): N\u01a1i \u0111\u1ea5t r\u1eebng tre lu\u1ed3ng sinh tr\u01b0\u1edfng t\u1ed1t c\u00f3 h\u00e0m l\u01b0\u1ee3ng s\u00e9t v\u1eadt l\u00fd t\u1eeb 72,8% \u0111\u1ebfn 65% (\u0111\u1ea5t s\u00e9t nh\u1eb9). N\u01a1i \u0111\u1ea5t r\u1eebng tre lu\u1ed3ng sinh tr\u01b0\u1edfng x\u1ea5u c\u00f3 h\u00e0m l\u01b0\u1ee3ng s\u00e9t v\u1eadt l\u00fd t\u1eeb 54% \u0111\u1ebfn 46% (th\u1ecbt n\u1eb7ng hay s\u00e9t pha n\u1eb7ng).<\/p>\n<p><strong><em>1.2.\u0110\u1ed9ng th\u00e1i \u0111\u1ed9 \u1ea9m c\u1ee7a \u0111\u1ea5t<\/em><\/strong><\/p>\n<p><em>N\u01a1i \u0111\u1ea5t r\u1eebng tre lu\u1ed3ng sinh tr\u01b0\u1edfng t\u1ed1t:<\/em><\/p>\n<p>\u0110\u1ea5t h\u1ea7u nh\u01b0 \u0111\u1ee7 \u1ea9m quanh n\u0103m, c\u00f3 t\u1eeb 303 \u0111\u1ebfn 309 ng\u00e0y (kho\u1ea3ng 10 th\u00e1ng) \u0111\u1ea5t ho\u00e0n to\u00e0n \u0111\u1ee7 \u1ea9m cho r\u1eebng tre lu\u1ed3ng sinh tr\u01b0\u1edfng. S\u1ed1 ng\u00e0y \u0111\u1ea5t c\u00f3 \u0111\u1ed9 \u1ea9m thi\u1ebfu h\u1ee5t, b\u1eaft \u0111\u1ea7u c\u00f3 \u1ea3nh h\u01b0\u1edfng x\u1ea5u \u0111\u1ebfn sinh tr\u01b0\u1edfng c\u1ee7a th\u1ef1c v\u1eadt n\u00f3i chung v\u00e0 r\u1eebng tre lu\u1ed3ng n\u00f3i ri\u00eang kh\u00f4ng nhi\u1ec1u c\u00f3 t\u1eeb 56 ng\u00e0y \u0111\u1ebfn 62 ng\u00e0y trong 1 n\u0103m (kho\u1ea3ng g\u1ea7n 2 th\u00e1ng), nh\u01b0ng nh\u1eefng ng\u00e0y \u0111\u1ea5t thi\u1ebfu \u1ea9m th\u01b0\u1eddng ch\u1ec9 k\u00e9o d\u00e0i t\u1eeb 2 \u0111\u1ebfn 3 ng\u00e0y xen k\u1ebd nhau, v\u00e0 \u0111\u1ea5t thi\u1ebfu \u1ea9m ch\u1ec9 t\u1eadp trung \u1edf l\u1edbp \u0111\u1ea5t m\u1eb7t v\u1edbi \u0111\u1ed9 s\u00e2u t\u1eeb 0cm-20cm. R\u1ea5t \u00edt khi \u0111\u1ed9 \u1ea9m c\u1ee7a \u0111\u1ea5t thi\u1ebfu h\u1ee5t k\u00e9o t\u1edbi \u0111\u1ed9 s\u00e2u t\u1eeb 30cm \u0111\u1ebfn 60cm.<\/p>\n<p>V\u00e0o m\u00f9a m\u01b0a, trong nh\u1eefng ng\u00e0y m\u01b0a l\u1edbn, \u0111\u1ea5t b\u1ecb th\u1eeba \u1ea9m \u1edf t\u1ea7ng \u0111\u1ea5t m\u1eb7t (0-20cm) nh\u01b0ng do \u0111\u1ea5t th\u1ea5m n\u01b0\u1edbc nhanh, n\u00ean kh\u00f4ng g\u00e2y ra hi\u1ec7n t\u01b0\u1ee3ng \u0111\u1ea5t b\u1ecb \u0111\u1ecdng n\u01b0\u1edbc trong th\u1eddi gian d\u00e0i, c\u00f3 \u1ea3nh h\u01b0\u1edfng x\u1ea5u \u0111\u1ebfn sinh tr\u01b0\u1edfng c\u1ee7a th\u1ef1c v\u1eadt.<\/p>\n<h3><u>N\u01a1i \u0111\u1ea5t r\u1eebng tre lu\u1ed3ng sinh tr\u01b0\u1edfng x\u1ea5u:<\/u><\/h3>\n<p>Trong 1 n\u0103m c\u00f3 t\u1eeb 235 ng\u00e0y \u0111\u1ebfn 283 ng\u00e0y \u0111\u1ea5t kh\u00f4ng \u00f3 \u0111\u1ee7 \u0111\u1ed9 \u1ea9m c\u1ea7n thi\u1ebft cho c\u00e2y tr\u1ed3ng sinh tr\u01b0\u1edfng (k\u00e9o d\u00e0i t\u1eeb 8 th\u00e1ng \u0111\u1ebfn h\u01a1n 9 th\u00e1ng trong 1 n\u0103m). Trong \u0111\u00f3 c\u00f3 t\u1eeb 40 \u0111\u1ebfn 90, ng\u00e0y \u1edf t\u1ea7ng \u0111\u1ea5t m\u1eb7t (0-20cm) \u0111\u1ed9 \u1ea9m c\u1ee7a \u0111\u1ea5t b\u1ecb thi\u1ebfu h\u1ee5t \u1ea3nh h\u01b0\u1edfng nghi\u00eam tr\u1ecdng \u0111\u1ebfn sinh tr\u01b0\u1edfng c\u1ee7a th\u1ef1c v\u1eadt. M\u1eb7c d\u00f9 kh\u00ed h\u1eadu c\u1ee7a v\u00f9ng theo d\u00f5i \u0111\u1ed9 \u1ea9m c\u1ee7a \u0111\u1ea5t, l\u00e0 v\u00f9ng kh\u00ed h\u1eadu nhi\u1ec7t \u0111\u1edbi \u1ea9m bi\u1ebfn t\u00ednh c\u1ea3 m\u00f9a \u0111\u00f4ng, v\u1edbi l\u01b0\u1ee3ng m\u01b0a h\u00e0ng n\u0103m kh\u00e1 cao 1800mm v\u00e0 ph\u00e2n b\u1ed1 t\u01b0\u01a1ng \u0111\u1ed1i \u0111\u1ec1u trong n\u0103m.<\/p>\n<p><strong><em>1.3.\u0110\u1eb7c \u0111i\u1ec3m ho\u00e1 t\u00ednh c\u1ee7a \u0111\u1ea5t &#8211; \u0111\u1ed9 chua c\u1ee7a \u0111\u1ea5t<\/em><\/strong><\/p>\n<p>K\u1ebft qu\u1ea3 ph\u00e2n t\u00edch 17 ph\u1eabu di\u1ec7n \u0111\u1ea5t \u1edf c\u00e1c n\u01a1i c\u00f3 r\u1eebng tre lu\u1ed3ng sinh tr\u01b0\u1edfng t\u1ed1t x\u1ea5u kh\u00e1c nhau, cho th\u1ea5y \u0111\u1ed9 pH c\u1ee7a \u0111\u1ea5t \u1edf t\u1ea7ng m\u1eb7t nh\u01b0 sau:<\/p>\n<p>&#8211; \u1edf c\u00e1c n\u01a1i \u0111\u1ea5t r\u1eebng tre lu\u1ed3ng sinh tr\u01b0\u1edfng t\u1ed1t, th\u01b0\u1eddng \u0111\u1ed9 chua c\u1ee7a \u0111\u1ea5t t\u1eadp trung v\u00e0o kho\u1ea3ng: pH(H<sub>2<\/sub>0): 4,8 &#8211; 5,9<\/p>\n<p>pH (KCL): 4,2 &#8211; 5,0<\/p>\n<p>thu\u1ed9c lo\u1ea1i \u0111\u1ea5t chua.<\/p>\n<p>&#8211; N\u01a1i \u0111\u1ea5t r\u1eebng tre lu\u1ed3ng sinh tr\u01b0\u1edfng x\u1ea5u, \u0111\u1ea5t th\u01b0\u1eddng c\u00f3 ph\u1ea3n \u1ee9ng chua m\u1ea1nh<\/p>\n<p>pH (KCL) = 3,6 &#8211; 3,8 (&lt; 4,0)<\/p>\n<p>Tuy nhi\u00ean, r\u1eebng tre lu\u1ed3ng c\u00f3 th\u1ec3 sinh tr\u01b0\u1edfng tr\u00ean nhhi\u1ec1u lo\u1ea1i \u0111\u1ea5t cso \u0111\u1ed9 chua kh\u00e1c nhau: pH (KCL) t\u1eeb 3,6 (chua m\u1ea1nh) \u0111\u1ebfn 7,2 (trung t\u00ednh).<\/p>\n<p>1.4. M\u1ed1i quan h\u1ec7 gi\u1eefa h\u00e0m l\u01b0\u1ee3ng m\u00f9n (%) v\u00e0 c\u00e1c ch\u1ea5t kho\u00e1ng dinh d\u01b0\u1ee1ng N,P,K c\u00f3 trong \u0111\u1ea5t v\u1edbi s\u1ef1 sinh tr\u01b0\u1edfng t\u1ed1t, x\u1ea5u c\u1ee7a r\u1eebng tre lu\u1ed3ng: (nghi\u00ean c\u1ee9u \u0111\u1ea5t t\u1ea1i 13 \u00f4 ti\u00eau chu\u1ea9n r\u1eebng tre lu\u1ed3ng)<\/p>\n<p>&#8211; M\u1ed1i quan h\u1ec7 gi\u1eefa h\u00e0m l\u01b0\u1ee3ng m\u00f9n (%) \u1edf t\u1ea7ng \u0111\u1ea5t m\u1eb7t (0-10cm) v\u1edbi m\u1ee9c \u0111\u1ed9 t\u0103ng tr\u01b0\u1edfng v\u1ec1 \u0111\u01b0\u1eddng k\u00ednh c\u1ee7a c\u00e2y tre lu\u1ed3ng:<\/p>\n<p>Ph\u01b0\u01a1ng tr\u00ecnh c\u00f3 d\u1ea1ng:<\/p>\n<p>y = 14,0968 &#8211; 16,9396x + 6,5302x<sup>2<\/sup> (c\u00f3 h\u1ec7 s\u1ed1 t\u01b0\u01a1ng quan r = 0,8950)<\/p>\n<p>Hay y = 0,8993 + 2,1232x (c\u00f3 h\u1ec7 s\u1ed1 t\u01b0\u01a1ng quan r = 0,7363)<\/p>\n<p>Trong \u0111\u00f3: y: l\u00e0 h\u00e0m l\u01b0\u1ee3ng m\u00f9n (%) \u1edf t\u1ea7ng \u0111\u1ea5t m\u1eb7t (0-10cm)<\/p>\n<p>x: l\u00e0 \u0111\u01b0\u1eddng k\u00ednh trung b\u00ecnh c\u1ee7a c\u00e2y tre lu\u1ed3ng trong r\u1eebng t\u00ednh b\u1eb1ng cm.<\/p>\n<p>&#8211; M\u1ed1i quan h\u1ec7 gi\u1eefa h\u00e0m l\u01b0\u1ee3ng N t\u1ed5ng s\u1ed1 (%) \u1edf t\u1ea7ng \u0111\u1ea5t m\u1eb7t (0-10cm) v\u1edbi m\u1ee9c \u0111\u1ed9 t\u0103ng tr\u01b0\u1edfng v\u1ec1 \u0111\u01b0\u1eddng k\u00ednh c\u1ee7a c\u00e2y tre lu\u1ed3ng trong r\u1eebng (0cm):<\/p>\n<p>Ph\u01b0\u01a1ng tr\u00ecnh c\u00f3 d\u1ea1ng<\/p>\n<p>y = 0,3385 &#8211; 0,3484x + 0,1774x<sup>2<\/sup> (c\u00f3 h\u1ec7 s\u1ed1 t\u01b0\u01a1ng quan r = 0,9210)<\/p>\n<p>hay y = -0,0201 + 0,169x (c\u00f3 h\u1ec7 s\u1ed1 t\u01b0\u01a1ng quan r = 0,8967)<\/p>\n<p>Trong \u0111\u00f3: y: l\u00e0 h\u00e0m l\u01b0\u1ee3ng N t\u1ed5ng s\u1ed1 (%) \u1edf t\u1ea7ng \u0111\u1ea5t m\u1eb7t (0-10cm)<\/p>\n<p>x: l\u00e0 \u0111\u01b0\u1eddng k\u00ednh trung b\u00ecnh c\u1ee7a c\u00e2y tre lu\u1ed3ng trong r\u1eebng ( cm).<\/p>\n<p>&#8211; M\u1ed1i quan h\u1ec7 gi\u1eefa h\u00e0m l\u01b0\u1ee3ng K<sub>2<\/sub>0 \u0111\u1ec3 ti\u00eau \u0111\u1ea5t t\u1ea7ng m\u1eb7t (0-10cm) t\u00ednh b\u1eb1ng mg\/100g \u0111\u1ea5t, m\u1edbi m\u1ee9c \u0111\u1ed9 t\u1eb1ng tr\u01b0\u1edfng v\u1ec1 \u0111\u01b0\u1eddng k\u00ednh tr\u00f9n b\u00ecnh c\u1ee7a c\u00e2y tre lu\u1ed3ng trong r\u1eebng (Dcm).<\/p>\n<p>Ph\u01b0\u01a1ng tr\u00ecnh c\u00f3 d\u1ea1ng:<\/p>\n<p>Y = -27,2483 + 38,7532x &#8211; 8,6746x<sup>2<\/sup><\/p>\n<p>H\u1ec7 s\u1ed1 t\u01b0\u01a1ng quan r = 0,8372<\/p>\n<p>hay y= &#8211; 9,7171 + 13,4306x h\u1ec7 s\u1ed1 t\u01b0\u01a1ng quan r = 0,8372<\/p>\n<p>Trong \u0111\u00f3: y l\u00e0 h\u00e0m l\u01b0\u1ee3ng K<sub>2<\/sub>O \u0111\u1ec3 ti\u00eau \u0111\u1ea5t (mg\/100 \u0111\u1ea5t, x l\u00e0 \u0111\u01b0\u1eddng k\u00ednh trung b\u00ecnh c\u1ee7a c\u00e2y tre lu\u1ed3ng trong r\u1eebng ( cm).<\/p>\n<p>M\u1ed1i quan h\u1ec7 gi\u1eefa h\u00e0m l\u01b0\u1ee3ng K<sub>2<\/sub>o d\u1ec5 ti\u00eau \u1edf t\u1ea7ng \u0111\u1ea5t m\u1eb7t (0-10cm) t\u00ednh b\u1eb1ng mg\/100g \u0111\u1ea5t, v\u1edbi m\u1ee9c \u0111\u1ed9 t\u0103ng tr\u01b0\u1edfng v\u1ec1 \u0111\u01b0\u1eddng k\u00ednh trung b\u00ecnh c\u1ee7a c\u00e2y tre lu\u1ed3ng trong r\u1eebng ( cm).<\/p>\n<p>Ph\u01b0\u01a1ng tr\u00ecnh c\u00f3 d\u1ea1ng:<\/p>\n<p>y = -27,2483 + 38,7532x &#8211; 8,6746x<sup>2<\/sup> (h\u1ec7 s\u1ed1 t\u01b0\u01a1ng quan r = 0,8459)<\/p>\n<p>hay y = -9,7171 + 13,4306x (h\u1ec7 s\u1ed1 t\u01b0\u01a1ng quan r = 0,8372)<\/p>\n<p>Trong \u0111\u00f3: y l\u00e0 h\u00e0m l\u01b0\u1ee3ng K<sub>2<\/sub>0 d\u1ec5 ti\u00eau trong \u0111\u1ea5t (mg\/100g \u0111\u1ea5t)<\/p>\n<p>x l\u00e0 \u0111\u01b0\u1eddng k\u00ednh trung b\u00ecnh c\u1ee7a c\u00e2y tre lu\u1ed3ng trong r\u1eebng ( cm).<\/p>\n<p>&#8211; M\u1ed7i quan h\u1ec7 gi\u1eefa h\u00e0m l\u01b0\u1ee3ng P<sub>2<\/sub>0<sub>5<\/sub> d\u1ec5 ti\u00eau trong \u0111\u1ea5t (mg\/100g \u0111\u1ea5t) \u1edf t\u1ea7ng \u0111\u1ea5t m\u1eb7t (0-10cm) v\u1edbi m\u1ee9c \u0111\u1ed9 t\u0103ng tr\u01b0\u1edfng v\u1ec1 \u0111\u01b0\u1eddng k\u00ednh ( cm) c\u1ee7a c\u00e2y tre lu\u1ed3ng trong r\u1eebng.<\/p>\n<p>Ph\u01b0\u01a1ng tr\u00ecnh c\u00f3 d\u1ea1ng:<\/p>\n<p>y = 7,5172 + 12,4939x &#8211; 4,4191x<sup>2<\/sup> (h\u1ec7 s\u1ed1 t\u01b0\u01a1ng quan kh\u00f4ng ch\u1eb7t ch\u1ebd r = 0,4358)<\/p>\n<p>hay y = 1,4136 &#8211; 0,4063x (h\u1ec7 s\u1ed1 t\u01b0\u01a1ng quan r\u1ea5t th\u1ea5p r =&#8221;0,1337) Trong \u0111\u00f3: y l\u00e0 h\u00e0m l\u01b0\u1ee3ng P<sub>2<\/sub>0<sub>5 <\/sub>d\u1ec5 ti\u00eau trong \u0111\u1ea5t (mg\/100g \u0111\u1ea5t)<\/p>\n<p>x l\u00e0 \u0111\u01b0\u1eddng k\u00ednh trung b\u00ecnh c\u1ee7a c\u00e2y tre lu\u1ed3ng trong r\u1eebng ( cm).<\/p>\n<p>&#8211; M\u1ed7i t\u01b0\u01a1ng quan k\u1ebft h\u1ee3p gi\u1eefa 3 y\u1ebfu t\u1ed1 kho\u00e1ng dinh d\u01b0\u1ee1ng c\u00f3 trong \u0111\u1ea5t (t\u1ea7ng \u0111\u1ea5t m\u1eb7t 0-10cm) N%, P<sub>2<\/sub>0<sub>5 <\/sub>(mg\/100g \u0111\u1ea5t) d\u1ec5 ti\u00eau, v\u00e0 K<sub>2<\/sub>0 d\u1ec5 ti\u00eau (mg\/100g \u0111\u1ea5t) v\u1edbi m\u1ee9c \u0111\u1ed9 t\u0103ng tr\u01b0\u1edfng v\u1ec1 \u0111\u01b0\u1eddng k\u00ednh c\u1ee7a c\u00e2y tre lu\u1ed3ng trong r\u1eebng.<\/p>\n<p>Ph\u01b0\u01a1ng tr\u00ecnh c\u00f3 d\u1ea1ng<\/p>\n<p>y = 0,2728 + 4,2900 x<sub>1<\/sub> + 0,0719x<sub>2<\/sub> + 0,0148x<sub>3<\/sub><\/p>\n<p>(h\u1ec7 s\u1ed1 t\u01b0\u01a1ng quan r\u1ea5t ch\u1eb7t r = 0,9479)<\/p>\n<p>Trong \u0111\u00f3: y l\u00e0 \u0111\u01b0\u1eddng k\u00ednh trung b\u00ecnh ( cm) c\u1ee7a c\u00e2y tre lu\u1ed3ng<\/p>\n<p>x<sub>1<\/sub> l\u00e0 h\u00e0m l\u01b0\u1ee3ng N t\u1ed5ng s\u1ed1 (%)<\/p>\n<p>x<sub>2<\/sub> l\u00e0 h\u00e0m l\u01b0\u1ee3ng P<sub>2<\/sub>0<sub>5<\/sub> d\u1ec5 ti\u00eau (mg\/100g \u0111\u1ea5t)<\/p>\n<p>x<sub>3<\/sub> l\u00e0 h\u00e0m l\u01b0\u1ee3ng K<sub>2<\/sub>0 d\u1ec5 ti\u00eau (mg\/100g \u0111\u1ea5t).<\/p>\n<p>K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u c\u00e1c m\u1ed1i t\u01b0\u01a1ng quan \u1edf tr\u00ean \u0111\u00e3 ch\u1ee9ng t\u1ecf r\u1eb1ng:<\/p>\n<p>&#8211; H\u00e0m l\u01b0\u1ee3ng m\u00f9n (%) v\u00e0 N t\u1ed5ng s\u1ed1 (%) \u1edf t\u1ea7ng \u0111\u1ea5t m\u1eb7t (0-10cm) c\u00f3 m\u1ed1i t\u01b0\u01a1ng quan r\u1ea5t ch\u1eb7t ch\u1ebd v\u1edbi s\u1ef1 sinh tr\u01b0\u1edfng v\u1ec1 \u0111\u01b0\u1eddng k\u00ednh c\u1ee7a c\u00e2y tre lu\u1ed3ng, \u0111\u1eb7c bi\u1ec7t l\u00e0 h\u00e0m l\u01b0\u1ee3ng N t\u1ed5ng s\u1ed1 trong \u0111\u1ea5t.<\/p>\n<p>&#8211; H\u00e0m l\u01b0\u1ee3ng K<sub>2<\/sub>0 d\u1ec5 ti\u00eau trong \u0111\u1ea5t (mg\/100g \u0111\u1ea5t) t\u1ea7ng \u0111\u1ea5t m\u1eb7t c\u0169ng c\u00f3 m\u1ed7i t\u01b0\u01a1ng quan t\u01b0\u01a1ng \u0111\u1ed1i ch\u1eb7t v\u1edbi s\u1ef1 sinh tr\u01b0\u1edfng v\u1ec1 \u0111\u01b0\u1eddng k\u00ednh c\u1ee7a c\u00e2y tre lu\u1ed3ng.<\/p>\n<p>&#8211; H\u00e0m l\u01b0\u1ee3ng P<sub>2<\/sub>0<sub>5 <\/sub>d\u1ec5 ti\u00eau trong \u0111\u1ea5t (mg\/100g \u0111\u1ea5t) t\u1ea7ng \u0111\u1ea5t m\u1eb7t c\u00f3 m\u1ed7i t\u01b0\u01a1ng quan kh\u00f4ng ch\u1eb7t ch\u1ebd v\u1edbi s\u1ef1 sinh tr\u01b0\u1edfng v\u1ec1 \u0111\u01b0\u1eddng k\u00ednh c\u1ee7a c\u00e2y tre lu\u1ed3ng.<\/p>\n<p>\u0110i\u1ec1u \u0111\u00f3 c\u00f3 ngh\u0129a l\u00e0 c\u00e2y tre lu\u1ed3ng c\u00f3 nhu c\u1ea7u r\u1ea5t cao v\u1ec1 \u0111\u1ea1m v\u00e0 K<sub>2<\/sub>0 \u1edf trong \u0111\u1ea5t, nh\u01b0ng c\u00f3 nhu c\u1ea7u kh\u00f4ng cao P<sub>2<\/sub>0<sub>5 <\/sub>trong \u0111\u1ea5t. M\u1eb7c d\u00f9 \u0111\u1ea5t feralit tr\u1ed3ng r\u1eebng tre lu\u1ed3ng \u1edf Vi\u1ec7t Namc\u00f3 h\u00e0m l\u01b0\u1ee3ng P<sub>2<\/sub>0<sub>5 <\/sub>d\u1ec5 ti\u00eau trong \u0111\u1ea5t kh\u00f4ng cao. Nh\u1eadn \u0111\u1ecbnh tr\u00ean c\u0169ng ph\u00f9 h\u1ee3p v\u1edbi k\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u v\u1ec1 sinh l\u00fd c\u1ee7a tre tr\u00fac \u1edf Nh\u1eadt B\u1ea3n (Keifro Inoue &#8211; 1960).<\/p>\n<p>T\u1ed5ng h\u1ee3p c\u1ea3 3 y\u1ebfu t\u1ed1 c\u00e1c ch\u1ea5t kho\u00e1ng dinh d\u01b0\u1ee1ng N,P,K c\u00f3 trong \u0111\u1ea5t \u0111\u00e3 c\u00f3 m\u1ed1i t\u01b0\u01a1ng quan r\u1ea5t ch\u1eb7t ch\u1ebd v\u1edbi s\u1ef1 sinh tr\u01b0\u1edfng v\u1ec1 \u0111\u01b0\u1eddng k\u00ednh c\u1ee7a c\u00e2y tre lu\u1ed3ng (r = 0,9479). \u0110i\u1ec1u \u0111\u00f3 \u0111\u00e3 ch\u1ee9ng t\u1ecf, c\u00e2y tre lu\u1ed3ng l\u00e0 m\u1ed9t lo\u00e0i c\u00e2y c\u00f3 nhu c\u1ea7u cao v\u1ec1 c\u00e1c ch\u1ea5t kho\u00e1ng dinh d\u01b0\u1ee1ng N,P,K c\u00f3 trong \u0111\u1ea5t. Hay n\u00f3i m\u1ed9t c\u00e1ch kh\u00e1c, c\u00e2y tre lu\u1ed3ng c\u00f3 nhu c\u1ea7u tr\u1ed3ng tr\u00ean \u0111\u1ea5t t\u1ed1t, c\u00f3 \u0111\u1ed9 ph\u00ec cao.<\/p>\n<p>K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u \u0111\u1ea5t \u1edf 8 \u00f4 ti\u00eau chu\u1ea9n r\u1eebng tre lu\u1ed3ng sinh tr\u01b0\u1edfng t\u1ed1t \u1edf c\u00e1c huy\u1ec7n: Ng\u1ecdc L\u1ea1c, Lang Ch\u00e1nh, v\u00e0 Th\u01b0\u1eddng Xu\u00e2n thu\u1ed9c t\u1ec9nh Thanh Ho\u00e1 c\u0169ng th\u1ec3 hi\u1ec7n r\u1eb1ng:<\/p>\n<p>\u00b7 H\u00e0m l\u01b0\u1ee3ng m\u00f9n (%) th\u1ea5p nh\u1ea5t: 3,55% (trung b\u00ecnh)<\/p>\n<p>cao nh\u1ea5t: 6,34(%) (gi\u00e0u m\u00f9n)<\/p>\n<p>Trung b\u00ecnh: 4,46(%) (trung b\u00ecnh kh\u00e1)<\/p>\n<p>\u00b7 H\u00e0m l\u01b0\u1ee3ng N (%) t\u1ed5ng s\u1ed1 th\u1ea5p nh\u1ea5t: 0,23% (gi\u00e0u \u0111\u1ea1m)<\/p>\n<p>Cao nh\u1ea5t: 0,34% (r\u1ea5t gi\u00e0u \u0111\u1ea1m t\u1ed5ng s\u1ed1)<\/p>\n<p>Trung b\u00ecnh: 0,27% (thu\u1ed9c lo\u1ea1i \u0111\u1ea5t gi\u00e0u \u0111\u1ea1m)<\/p>\n<p>\u00b7 H\u00e0m l\u01b0\u1ee3ng K<sub>2<\/sub>0 d\u1ec5 ti\u00eau (mg\/100g \u0111\u1ea5t) th\u1ea5p nh\u1ea5t: 10,5mg\/100g \u0111\u1ea5t (gi\u00e0u)<\/p>\n<p>Cao nh\u1ea5t: 18,2mg\/100g \u0111\u1ea5t (r\u1ea5t gi\u00e0u)<\/p>\n<p>Trung b\u00ecnh: 12,8mg\/100g \u0111\u1ea5t (lo\u1ea1i gi\u00e0u Kali).<\/p>\n<p>\u00b7 H\u00e0m l\u01b0\u1ee3ng P<sub>2<\/sub>0<sub>5<\/sub> d\u1ec5 ti\u00eau (mg\/100g \u0111\u1ea5t) th\u1ea5p nh\u1ea5t: 0,1mg\/100g \u0111\u1ea5t (r\u1ea5t ngh\u00e8o)<\/p>\n<p>Cao nh\u1ea5t: 1,8mg\/100g \u0111\u1ea5t (ngh\u00e8o)<\/p>\n<p>Trung b\u00ecnh: 1,2mg\/100g \u0111\u1ea5t (r\u1ea5t ngh\u00e8o)<\/p>\n<p>(nghi\u00ean c\u1ee9u \u1edf t\u1ea7ng \u0111\u1ea5t m\u1eb7t 0-10cm)<\/p>\n<p>K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u \u1edf 10 \u00f4 ti\u00eau chu\u1ea9n r\u1eebng tre lu\u1ed3ng sinh tr\u01b0\u1edfng x\u1ea5u \u1edf 4 huy\u1ec7n tr\u1ed3ng tre lu\u1ed3ng \u1edf t\u1ec9nh Thanh Ho\u00e1.<\/p>\n<p>S\u1ed1 li\u1ec7u trung b\u00ecnh c\u1ee7a 10 ph\u1eabu di\u1ec7n \u0111\u1ea5t t\u1ea1i 10 \u00f4 ti\u00eau chu\u1ea9n t\u1ea7ng \u0111\u1ea5t m\u1eb7t (0-10cm)<\/p>\n<p>H\u00e0m l\u01b0\u1ee3ng m\u00f9n (%): 2,81% (trung b\u00ecnh)<\/p>\n<p>H\u00e0m l\u01b0\u1ee3ng N t\u1ed5ng s\u1ed1: 0,17%% (kh\u00e1)<\/p>\n<p>H\u00e0m l\u01b0\u1ee3ng P<sub>2<\/sub>0<sub>5<\/sub> d\u1ec5 ti\u00eau: 1,1mg\/100g \u0111\u1ea5t (r\u1ea5t ngh\u00e8o)<\/p>\n<p>T\u00f3m l\u1ea1i: sau 5 n\u0103m nghi\u00ean c\u1ee9u, v\u1edbi nhi\u1ec1u ph\u01b0\u01a1ng ph\u00e1p nghi\u00ean c\u1ee9u kh\u00e1c nhau \u0111\u00e3 \u0111i t\u1edbi kh\u1eb3ng \u0111\u1ecbnh r\u1eb1ng: tre lu\u1ed3ng l\u00e0 m\u1ed9t lo\u00e0i c\u00e2y tr\u1ed3ng r\u1eebng \u0111\u00f2i h\u1ecfi tr\u1ed3ng tr\u00ean \u0111\u1ea5t t\u1ed1t v\u1edbi c\u00e1c \u0111\u1eb7c \u0111i\u1ec3m sau \u0111\u00e2y:<\/p>\n<p>&#8211; \u0110\u1ea5t x\u1ed1p (\u0111\u1ed9 x\u1ed1p&gt;50%, \u0111\u1ed9 x\u1ed1p th\u00edch h\u1ee3p \u00b355%)<\/p>\n<p>&#8211; \u0110\u1ea5t c\u00f3 th\u00e0nh ph\u1ea7n c\u01a1 gi\u1edbi n\u1eb7ng, gi\u00e0u h\u1ea1t s\u00e9t (t\u1eeb s\u00e9t pha n\u1eb7ng \u0111\u1ebfn s\u00e9t trung b\u00ecnh).<\/p>\n<p>&#8211; \u0110\u1ea5t c\u00f3 \u0111\u1ed9 th\u1ea5m n\u01b0\u1edbc cao, \u0111\u1ed9 \u1ea9m t\u1ed1t g\u1ea7n nh\u01b0 \u0111\u1ee7 \u1ea9m quanh n\u0103m cho th\u1ef1c v\u1eadt sinh tr\u01b0\u1edfng, nh\u01b0ng tho\u00e1t n\u01b0\u1edbc t\u1ed1t kh\u00f4ng b\u1ecb \u0111\u1ecdng n\u01b0\u1edbc.<\/p>\n<p>&#8211; \u0110\u1ea5t c\u00f3 ph\u1ea3n \u1ee9ng chua ho\u1eb7c \u00edt chua ( )<\/p>\n<p>&#8211; H\u00e0m l\u01b0\u1ee3ng m\u00f9n kh\u00e1 ho\u1eb7c gi\u00e0u \u00b34,5%.<\/p>\n<p>&#8211; H\u00e0m l\u01b0\u1ee3ng N t\u1ed5ng s\u1ed1 (%) thu\u1ed9c lo\u1ea1i gi\u00e0u (\u00b30,25%)<\/p>\n<p>&#8211; H\u00e0m l\u01b0\u1ee3ng K<sub>2<\/sub>0 d\u1ec5 ti\u00eau c\u0169ng thu\u1ed9c lo\u1ea1i gi\u00e0u \u00b310mg\/100g \u0111\u1ea5t<\/p>\n<p>(Ch\u00fa th\u00edch: trong s\u1ea3n xu\u1ea5t, th\u01b0\u1eddng ch\u1ecdn \u0111\u1ea5t c\u00f3 t\u1ea7ng \u0111\u1ea5t d\u00e0y 60cm v\u00e0 \u0111\u1ed9 d\u1ed1c &lt;20<sup>0<\/sup> \u0111\u1ec3 tr\u1ed3ng r\u1eebng tre lu\u1ed3ng. C\u00e1c lo\u1ea1i \u0111\u1ea5t c\u00f3 th\u00e0nh ph\u1ea7n c\u01a1 gi\u1edbi nh\u1eb9. C\u00e1t d\u00ednh ho\u1eb7c c\u00e1t pha kh\u00f4ng th\u00edch h\u1ee3p \u0111\u1ec3 tr\u1ed3ng r\u1eebng tre lu\u1ed3ng)<\/p>\n<p><strong>2. <\/strong><strong>\u1ea3nh<\/strong><strong>h\u01b0\u1edfng c\u1ee7a c\u00e1c ph\u01b0\u01a1ng th\u1ee9c tr\u1ed3ng r\u1eebng tre lu\u1ed3ng \u0111\u1ebfn \u0111\u1ea5t<\/strong><\/p>\n<p><strong><em>2.1. \u0110\u1eb7c \u0111i\u1ec3m c\u1ee7a h\u1ec7 r\u1ec5 tre lu\u1ed3ng<\/em><\/strong><\/p>\n<p>R\u1ec5 tre lu\u1ed3ng c\u00f3 \u0111\u01b0\u1eddng k\u00ednh \u00a31mm, ph\u00e1t tri\u1ec3n t\u1eeb th\u00e2n ng\u1ea7m, ph\u00e2n b\u1ed1 kh\u00e1 r\u1ed9ng. R\u1ec5 c\u00f3 th\u1ec3 ph\u00e2n b\u1ed1 c\u00e1ch g\u1ed1c tre m\u1eb9 t\u1edbi 10m, t\u1eadp trung ch\u1ee7 y\u1ebfu \u1edf kho\u1ea3ng c\u00e1ch 2m \u0111\u1ebfn 4m c\u00e1ch g\u1ed1c m\u1eb9 v\u00e0 t\u1eadp trung \u1edf \u0111\u1ed9 s\u00e2u t\u1eeb 0cm \u0111\u1ebfn 30cm, chi\u1ebfm kho\u1ea3ng 80% t\u1ed5ng s\u1ed1 r\u1ec5.<\/p>\n<p><strong><em>2.2. T\u00e1c d\u1ee5ng b\u1ea3o v\u1ec7 \u0111\u1ea5t, gi\u1ea3m c\u01b0\u1eddng \u0111\u1ed9 x\u00f3i m\u00f2n \u0111\u1ea5t<\/em><\/strong><\/p>\n<p>Nh\u1edd t\u00e1c d\u1ee5ng c\u1ee7a h\u1ec7 r\u1ec5 tre lu\u1ed3ng, m\u00e0 l\u1edbp \u0111\u1ea5t m\u1eb7t d\u01b0\u1edbi r\u1eebng tre lu\u1ed3ng \u0111\u01b0\u1ee3c h\u1ea1n ch\u1ebf m\u1ee9c \u0111\u1ed9 gi\u1ea3m th\u1ea5p \u0111\u1ed9 x\u1ed1p v\u00e0 kh\u1ea3 n\u0103ng th\u1ea5m n\u01b0\u1edbc c\u1ee7a \u0111\u1ea5t d\u01b0\u1edbi c\u00e1c tr\u1eadn m\u01b0a r\u00e0o nhi\u1ec7t \u0111\u1edbi.<\/p>\n<p>&#8211; \u0110\u1ed3ng th\u1eddi, nh\u1edd c\u00f3 l\u1edbp th\u1ea3m m\u1ee5c d\u01b0\u1edbi r\u1eebng tre lu\u1ed3ng, v\u1edbi t\u00e1c d\u1ee5ng b\u00e1m gi\u1eef \u0111\u1ea5t kh\u00e0 t\u1ed1t c\u1ee7a h\u1ec7 r\u1ec5 r\u1eebng tre lu\u1ed3ng m\u00e0 c\u01b0\u1eddng \u0111\u1ed9 x\u00f3i m\u00f2n \u0111\u1ea5t d\u01b0\u1edbi r\u1eebng tre lu\u1ed3ng r\u1ea5t th\u1ea5p.<\/p>\n<p>&#8211; L\u01b0\u1ee3ng \u0111\u1ea5t b\u1ecb m\u1ea5t h\u00e0ng n\u0103m d\u01b0\u1edbi r\u01b0\u00f9ng tre lu\u1ed3ng do x\u00f3i m\u00f2n l\u00e0 1,8 t\u1ea5n\/ha\/n\u0103m.<\/p>\n<p>&#8211; Trong khi \u0111\u00f3 \u1edf c\u00f9ng m\u1ed9t \u0111i\u1ec1u ki\u1ec7n t\u01b0\u01a1ng t\u1ef1 (\u0111\u1ed9 d\u1ed1c 17-18<sup>0<\/sup>) n\u01a1i \u0111\u1ea5t tr\u1ed1ng \u0111\u1ed3i tr\u1ecdc ch\u1ec9 c\u00f3 c\u1ecf t\u1ef1 nhi\u00ean, l\u01b0\u1ee3ng \u0111\u1ea5t m\u1eb7t b\u1ecb x\u00f3i m\u00f2n h\u00e0ng n\u0103m l\u00e0: 6,7 t\u1ea5n\/ha\/n\u0103m.<\/p>\n<p>&#8211; N\u01a1i tr\u1ed3ng s\u1eafn c\u00f9ng m\u1ed9t \u0111i\u1ec1u ki\u1ec7n t\u01b0\u01a1ng t\u1ef1, l\u01b0\u1ee3ng \u0111\u1ea5t m\u1eb7t b\u1ecb x\u00f3i m\u00f2n h\u00e0ng n\u0103m l\u00e0: 12,5 t\u1ea5n\/ha\/n\u0103m (L\u00ea Qu\u1ed1c Doanh- Vi\u1ec7n KHKTNN Vi\u1ec7t Nam-2000).<\/p>\n<p><strong><em>2.3. T\u1ed5ng l\u01b0\u1ee3ng th\u1ea3m m\u1ee5c r\u01a1i r\u1ee5ng tr\u1ea3 l\u1ea1i cho \u0111\u1ea5t d\u01b0\u1edbi r\u1eebng tre lu\u1ed3ng tr\u1ed3ng thu\u1ea7n lo\u00e0i t\u1eeb 6 tu\u1ed5i \u0111\u1ebfn 9 tu\u1ed5i<\/em><\/strong><\/p>\n<p>K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u li\u00ean t\u1ee5c trong 3 n\u0103m (1977-1979) v\u1ec1 l\u01b0\u1ee3ng th\u1ea3m m\u1ee5c r\u01a1i r\u1ee5ng d\u01b0\u1edbi r\u1eebng tre lu\u1ed3ng 6 tu\u1ed5i \u0111\u1ebfn 9 tu\u1ed5i, c\u00f3 m\u1eadt \u0111\u1ed9 tr\u1ed3ng 300 b\u1ee5i\/ha nh\u01b0 sau:<\/p>\n<p>&#8211; L\u01b0\u1ee3ng th\u1ea3m m\u1ee5c bi\u1ebfn \u0111\u1ed9ng t\u01b0\u01a1ng \u0111\u1ed1i l\u1edbn: 11.691kg-17.551kg\/n\u0103m (theo tr\u1ecdng l\u01b0\u1ee3ng kh\u00f4 trong kh\u00f4ng kh\u00ed).<\/p>\n<p>&#8211; L\u01b0\u1ee3ng th\u1ea3m m\u1ee5c r\u01a1i r\u1ee5ng trung b\u00ecnh trong 3 n\u0103m 14168kg\/n\u0103m (theo tr\u1ecdng l\u01b0\u1ee3ng kh\u00f4 trong kh\u00f4ng kh\u00ed) hay 12t\u1ea5n\/n\u0103m (theo tr\u1ecdng l\u01b0\u1ee3ng kh\u00f4 ki\u1ec7t)<\/p>\n<p>&#8211; L\u01b0\u1ee3ng N (%) t\u1ed5ng s\u1ed1 trong th\u1ea3m m\u1ee5c r\u01b0\u00f9ng tre lu\u1ed3ng l\u00e0 1,74% (theo tr\u1ecdng l\u01b0\u1ee3ng kh\u00f4 tuy\u1ec7t \u0111\u1ed1i). V\u1eady l\u01b0\u1ee3ng \u0111\u1ea1m r\u1eebng tre lu\u1ed3ng tr\u1ea3 l\u1ea1i cho \u0111\u1ea5t h\u00e0ng n\u0103m kho\u1ea3ng 220kg \u0111\u1ea1m nguy\u00ean ch\u1ea5t\/ha.<\/p>\n<p><strong><em>2.4. C\u1ea7n th\u1ef1c hi\u1ec7n r\u1eebng tre lu\u1ed3ng h\u1ed7n lo\u00e0i v\u1edbi c\u00e1c c\u00e2y g\u1ed7 h\u1ecd \u0111\u1eadu c\u00f3 kh\u1ea3 n\u0103ng c\u1ed1 \u0111\u1ecbnh N, \u0111\u1ec3 \u1ed5n \u0111\u1ecbnh \u0111\u1ed9 ph\u00ec c\u1ee7a \u0111\u1ea5t trong qu\u00e1 tr\u00ecnh kinh doanh r\u1eebng tre lu\u1ed3ng, v\u00e0 n\u00e2ng cao<\/em><\/strong><strong><em>n\u0103ng su\u1ea5t c\u1ee7a r\u1eebng tr\u1ed3ng.<\/em><\/strong><\/p>\n<p>C\u00e1c k\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u nh\u1eadn th\u1ea5y tr\u00ean \u0111\u1ea5t t\u1ed1t n\u1ebfu tr\u1ed3ng r\u1eebng thu\u1ea7n lo\u00e0i, sau 5 n\u0103m \u0111\u1ea7u, \u0111\u1ed9 ph\u00ec c\u1ee7a \u0111\u1ea5t \u0111\u00e3 b\u1ecb gi\u1ea3m th\u1ea5p \u0111i r\u00f5 r\u1ec7t:<\/p>\n<p>&#8211; H\u00e0m l\u01b0\u1ee3ng m\u00f9n t\u1eeb 5,78% (t\u1ea7ng \u0111\u1ea5t am\u1ef1t 0-10cm) gi\u1ea3m xu\u1ed1ng ch\u1ec9 c\u00f2n 4,48% (sau 5 n\u0103m)<\/p>\n<p>&#8211; H\u00e0m l\u01b0\u1ee3ng N% (t\u1ed5ng s\u1ed1 t\u1eeb 0,31% gi\u1ea3m xu\u1ed1ng ch\u1ec9 c\u00f2n 0,22%)<\/p>\n<p>&#8211; H\u00e0m l\u01b0\u1ee3ng s\u00e9t v\u1eadt l\u00fd t\u1eeb 75,5% gi\u1ea3m xu\u1ed1ng ch\u1ec9 c\u00f2n 66,8% (tr\u00ean \u0111\u1ea5t tr\u1ed1ng \u0111\u1ed3i n\u00fai tr\u1ecdc x\u1ea5u, c\u00f3 c\u1ea7y \u0111\u1ea5t, vun x\u1edbi, v\u00e0 b\u00f3n ph\u00e2n cho r\u1eebng tre lu\u1ed3ng th\u00ec hi\u1ec7n t\u01b0\u1ee3ng l\u1ea1i ng\u01b0\u1ee3c l\u1ea1i, \u0111\u1ed9 ph\u00ec c\u1ee7a \u0111\u1ea5t \u0111\u01b0\u1ee3c n\u00e2ng cao d\u1ea7n sau 5 n\u0103m tr\u1ed3ng r\u1eebng tre lu\u1ed3ng).<\/p>\n<p>N\u1ebfu \u00e1p d\u1ee5ng ph\u01b0\u01a1ng th\u1ee9c tr\u1ed3ng r\u1eebng h\u1ed7n lo\u1ea1i v\u1edbi c\u00e1c c\u00e2y g\u1ed7 h\u1ecd \u0110\u1eadu, b\u1ea3n \u0111\u1ecba, c\u00f3 kh\u1ea3 n\u0103ng \u1ed5n \u0111\u1ecbnh N: nh\u01b0 chim xanh (<em>erythrophloeum fordii<\/em>), lim x\u1eb9t (<em>Pelthophorum tomkinensis<\/em>), r\u00e0ng r\u00e0ng (<em>ormosia balansae<\/em>), v\u1edbi kho\u1ea3ng 200c\u00e2y\/ha t\u1ea1o th\u00e0nh r\u1eebng tre lu\u1ed3ng h\u1ed7n lo\u00e0i c\u00f3 k\u1ebft c\u1ea5u 2 t\u1ea7ng c\u00e2y:<\/p>\n<p>T\u1ea7ng I: C\u00e2y g\u1ed7 h\u1ecd \u0111\u1eadu c\u1ed1 \u0111\u1ecbnh N<\/p>\n<p>T\u1ea7ng II: Tre lu\u1ed3ng.<\/p>\n<p>T\u1ea7ng c\u00e2y g\u1ed7 c\u00f3 t\u00e1c d\u1ee5ng b\u1ea3o v\u1ec7 m\u0103ng tre kh\u00f4ng b\u1ecb \u0111\u1ecf g\u1eaby trong m\u00f9a m\u01b0a b\u00e3o l\u00e0m cho \u0111\u1ed9 \u1ea9m kh\u00f4ng kh\u00ed trong r\u1eebng t\u0103ng cao h\u01a1n, c\u00f3 \u0111\u1ed9 \u00e1nh s\u00e1ng th\u1ea5p, th\u00f3ch h\u1ee3p cho m\u0103ng tre lu\u1ed3ng ph\u00e1t tri\u1ec3n. R\u1eebng tre lu\u1ed3ng tr\u1ed3ng h\u1ed7n lo\u00e0i c\u00f2n c\u00f3 t\u00e1c d\u1ee5ng l\u00e0m gi\u1ea3m \u0111\u00e1ng k\u1ec3 s\u1ef1 tho\u00e1i ho\u00e1 c\u1ee7a \u0111\u1ea5t so v\u1edbi r\u1eebng tre lu\u1ed3ng tr\u1ed3ng thu\u1ea7n lo\u00e0i.<\/p>\n<p>V\u00ed d\u1ee5: H\u00e0m l\u01b0\u1ee3ng m\u00f9n 5,78% (t\u1ea7ng \u0111\u1ea5t m\u1eb7t 0-10cm) trong n\u0103m \u0111\u1ea7u, \u0111\u1ebfn n\u0103m th\u1ee9 n\u0103m v\u1eabn c\u00f2n: 5,24%.<\/p>\n<p>H\u00e0m l\u01b0\u1ee3ng N% t\u1ed5ng s\u1ed1: 0,31 n\u0103m \u0111\u1ea7u, \u0111\u1ebfn n\u0103m th\u1ee9 n\u0103m v\u1eabn c\u00f2n0,29%.<\/p>\n<p>T\u00e1c d\u1ee5ng ph\u00f2ng h\u1ed9 c\u1ee7a r\u1eebng tre lu\u1ed3ng tr\u1ed3ng h\u1ed7n lo\u00e0i v\u1edbi c\u00e2y g\u1ed7 h\u1ecd \u0110\u1eadu c\u0169ng cao h\u01a1n r\u1eebng tre lu\u1ed3ng tr\u1ed3ng tr\u1ed3ng thu\u1ea7n lo\u1ea1i. H\u01a1n n\u1eefa, n\u00f3 c\u00f2n c\u00f3 h\u1ea1n ch\u1ebf \u0111\u00e1ng k\u1ec3 hi\u1ec7n t\u01b0\u1ee3ng s\u00e2u b\u1ec7nh v\u00f2i voi ph\u00e1 ho\u1ea1i m\u0103ng tre lu\u1ed3ng.<\/p>\n<p><strong><em>2.5. Tr\u1ed3ng r\u1eebng tre lu\u1ed3ng theo ph\u01b0\u01a1ng th\u1ee9c n\u00f4ng l\u00e2m k\u1ebft h\u1ee3p<\/em><\/strong><\/p>\n<p>Trong 2 n\u0103m \u0111\u1ea7u, khi r\u1eebng tre lu\u1ed3ng tr\u1ed3ng ch\u01b0a kh\u00e9p t\u00e1n, ng\u01b0\u1eddi ta ti\u1ebfn h\u00e0nh tr\u1ed3ng xen c\u00e1c c\u00e2y n\u00f4ng nghi\u1ec7p ng\u1eafn ng\u00e0y v\u1edbi tre lu\u1ed3ng nh\u01b0 l\u1ea1c, l\u00faa n\u01b0\u01a1ng, s\u1eafn,&#8230;<\/p>\n<p>K\u1ebft qu\u1ea3 cho th\u1ea5y:<\/p>\n<p>+ R\u1eebng tre lu\u1ed3ng sinh tr\u01b0\u1edfng t\u1ed1t h\u01a1n t\u1eeb 15%-22% so v\u1edbi \u0111\u1ed1i ch\u1ee9ng kh\u00f4ng tr\u1ed3ng xen.<\/p>\n<p>+ Gi\u1ea3m \u0111\u01b0\u1ee3c s\u1ed1 c\u00f4ng lao \u0111\u1ed9ng chu\u1ea9n b\u1ecb \u0111\u1ea5t tr\u1ed3ng r\u1eebng: 64 c\u00f4ng.<\/p>\n<p>+ Gi\u1ea3m \u0111\u01b0\u1ee3c c\u00f4ng ch\u0103m s\u00f3c r\u1eebng trong c\u00e1c n\u0103m \u0111\u1ea7u : 72 c\u00f4ng.<\/p>\n<p>+ R\u1eebng tre \u0111\u01b0\u1ee3c b\u1ea3o v\u1ec7 t\u1ed1t h\u01a1n (kh\u00f4ng b\u1ecb tr\u00e2u b\u00f2, gia s\u00fac \u0103n l\u00e1 lu\u1ed3ng v\u00e0 ph\u00e1 ho\u1ea1i r\u1eebng tr\u1ed3ng)<\/p>\n<p>+ N\u00e2ng cao \u0111\u1ed9 che ph\u1ee7 m\u1eb7t \u0111\u1ea5t, t\u1eeb c\u00e1c t\u00e1n l\u00e1 c\u1ee7a c\u00e1c c\u00e2y n\u00f4ng nghi\u1ec7p tr\u1ed3ng xen, n\u00ean gi\u1ea3m \u0111\u01b0\u1ee3c c\u01b0\u1eddng \u0111\u1ed9 x\u00f3i m\u00f2n \u0111\u1ea5t trong m\u00f9a m\u01b0a, trong c\u00e1c n\u0103m \u0111\u1ea7u.<\/p>\n<p>+ T\u1ea1o ra thu nh\u1eadp c\u1ea7n thi\u1ebft cho c\u00e1c h\u1ed9 n\u00f4ng d\u00e2n trong c\u00e1c n\u0103m \u0111\u1ea7u, khi r\u1eebng tre lu\u1ed3ng ch\u01b0a cho thu nh\u1eadp.<\/p>\n<p>+ T\u1ea1o c\u01a1 s\u1edf v\u1eefng ch\u1eafc \u0111\u1ec3 th\u1ef1c hi\u1ec7n l\u00e2m nghi\u1ec7p x\u00e3 h\u1ed9i \u1edf v\u00f9ng n\u00fai.<\/p>\n<p>Cho n\u00ean t\u1ec9nh Thanh Ho\u00e1 v\u00e0 Ho\u00e0 B\u00ecnh \u0111\u00e3 \u0111\u01b0a r\u1eebng tre lu\u1ed3ng v\u00e0o lo\u1ea1i r\u1eebng ph\u00f2ng h\u1ed9 tr\u00ean c\u00e1c l\u01b0u v\u1ef1c s\u00f4ng l\u00e0 th\u00edch h\u1ee3p v\u00e0 c\u00f3 c\u01a1 s\u1edf khoa h\u1ecdc.<\/p>\n<p><strong><em>Summary:<\/em><\/strong><em>Dendrocalamus membranaceus<\/em>forest is a type of economic forest early giving income and gives rather high annual regular income at the same time is a forest type that exerts good effect on soil and water conservation.<\/p>\n<p><em>Dendrocalamus membranaceus <\/em>is a tropical forest plant species of high demand in moisture and mineral nutrients, especially N.<\/p>\n<p>Therefore area for <em>Dendrocalamus membranaceus <\/em>plantation establishment must have good soil manifested in the following features: porous (suitable porosity &gt; 55%), heavy texture, rich in clay particles, high water permeability, good water retention, sufficient moisture available almost all the year round for plant growth but no water- logging in rainy season. Soil reaction is acidic or slightly acidic (pH H<sub>2<\/sub>0 5 &#8211; 6.5). Humus content of surface soil layer is rather high or high (&gt;4.5%). Total N content is high (&gt; 0.25%). Soluble K<sub>2<\/sub>O content is high (&gt; 10mg\/ 100g).<\/p>\n<p>To raise high the environment protection effect and economic efficiency of <em>Dendrocalamus membranaceus <\/em>forest especially to ensure sustainable forest management there must be established mixed <em>Dendrocalamus membranaceus<\/em> plantation with leguminous tree species capable of N fixing and <em>Dendrocalamus membranaceus <\/em>planting in agro- forestry system.<\/p>\n<p><strong>T\u00e0i li\u1ec7u tham kh\u1ea3o ch\u00ednh<\/strong><\/p>\n<p>1. Nguy\u1ec5n V\u0103n T\u00edch, 1962. K\u1ef9 thu\u1eadt tr\u1ed3ng r\u1eebng tre lu\u1ed3ng,Vi\u1ec7n Nghi\u00ean c\u1ee9u L\u00e2m nghi\u1ec7p.<\/p>\n<p>2. Nguy\u1ec5n T\u1eed \u01af\u1edfng, 1969. K\u1ef9 thu\u1eadt khai th\u00e1c r\u1eebng n\u1ee9a l\u00e1 nh\u1ecf. Vi\u1ec7n KHLN Vi\u1ec7t Nam.<\/p>\n<p>3. Tr\u1ea7n Nguy\u00ean Gi\u1ea3ng, Vi\u1ec7n KHLN, 1981. Nghi\u00ean c\u1ee9u k\u1ef9 thu\u1eadt tr\u1ed3ng v\u00e0 kinh doanh r\u1eebng tre lu\u1ed3ng t\u1eadp trung c\u00f3 n\u0103ng su\u1ea5t cao, ch\u1ea5t l\u01b0\u1ee3ng t\u1ed1t v\u00e0 b\u1ec1n v\u1eefng.<\/p>\n<p>4. \u00d4n Th\u00e1i Huy (Trung Qu\u1ed1c), 1959. Tr\u00fac lo\u1ea1i kinh doanh.5. Koichiro Ueda (Japan), 1960. Studies on the physiology of Bamboo with reference to practical application.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>R\u1eebng tre lu\u1ed3ng l&agrave; m\u1ed9t lo\u1ea1i r\u1eebng kinh t\u1ebf s\u1edbm cho thu ho\u1ea1ch v&agrave; cho thu nh\u1eadp th\u01b0\u1eddng xuy&ecirc;n t\u01b0\u01a1ng \u0111\u1ed1i cao, \u0111\u1ed3ng th\u1eddi c\u0169ng l&agrave; lo\u1ea1i r\u1eebng c&oacute; t&aacute;c d\u1ee5ng ph&ograve;ng h\u1ed9 gi\u1eef \u0111\u1ea5t gi\u1eef n\u01b0\u1edbc t\u1ed1t. Tre lu\u1ed3ng l&agrave; lo&agrave;i c&acirc;y r\u1eebng nhi\u1ec7t \u0111\u1edbi \u01b0a \u1ea9m, c&oacute; nhu c\u1ea7u cao v\u1ec1 c&aacute;c ch\u1ea5t kho&aacute;ng dinh d\u01b0\u1ee1ng, \u0111\u1eb7c bi\u1ec7t l&agrave; \u0111\u1ea1m. \u0110\u1ea5t \u0111ai tuy kh&ocirc;ng ph\u1ea3i l&agrave; y\u1ebfu t\u1ed1 duy nh\u1ea5t c&oacute; t&aacute;c d\u1ee5ng quy\u1ebft \u0111\u1ecbnh \u0111\u1ebfn n\u0103ng xu\u1ea5t c\u1ee7a r\u1eebng lu\u1ed3ng, nh\u01b0ng nghi&ecirc;n c\u1ee9u c&aacute;c \u0111\u1eb7c \u0111i\u1ec3m c\u1ee7a \u0111\u1ea5t tr\u1ed3ng r\u1eebng tre lu\u1ed3ng gi&uacute;p cho vi\u1ec7c quy ho\u1ea1ch v&ugrave;ng tr\u1ed3ng lu\u1ed3ng th&iacute;ch h\u1ee3p. <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[18],"tags":[],"_links":{"self":[{"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts\/8605"}],"collection":[{"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/comments?post=8605"}],"version-history":[{"count":2,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts\/8605\/revisions"}],"predecessor-version":[{"id":19296,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts\/8605\/revisions\/19296"}],"wp:attachment":[{"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/media?parent=8605"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/categories?post=8605"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/tags?post=8605"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}