{"id":9572,"date":"2011-06-07T07:11:14","date_gmt":"2011-06-07T00:11:14","guid":{"rendered":"http:\/\/vafs.gov.vn\/vn\/2011\/06\/ket-qua-tuyen-chon-cac-dong-bach-dan-chong-chiu-benh-co-nang-suat-cao-o-vung-dong-nam-bo\/"},"modified":"2015-05-19T14:23:41","modified_gmt":"2015-05-19T07:23:41","slug":"ket-qua-tuyen-chon-cac-dong-bach-dan-chong-chiu-benh-co-nang-suat-cao-o-vung-dong-nam-bo","status":"publish","type":"post","link":"https:\/\/vafs.gov.vn\/vn\/ket-qua-tuyen-chon-cac-dong-bach-dan-chong-chiu-benh-co-nang-suat-cao-o-vung-dong-nam-bo\/","title":{"rendered":"K\u1ebft qu\u1ea3 tuy\u1ec3n ch\u1ecdn c\u00e1c d\u00f2ng b\u1ea1ch \u0111\u00e0n ch\u1ed1ng ch\u1ecbu b\u1ec7nh c\u00f3 n\u0103ng su\u1ea5t cao \u1edf v\u00f9ng \u0110\u00f4ng Nam b\u1ed9"},"content":{"rendered":"

Nguy\u1ec5n Ho\u00e0ng Ngh\u0129a, Ph\u1ea1m Quang Thu<\/strong><\/p>\n

Nguy\u1ec5n V\u0103n Chi\u1ebfn, Nguy\u1ec5n Minh Ch\u00ed<\/strong><\/p>\n

Vi\u1ec7n Khoa h\u1ecdc L\u00e2m nghi\u1ec7p Vi\u1ec7t Nam<\/em><\/p>\n

T\u00d3M T\u1eaeT<\/strong><\/p>\n

B\u1ea1ch \u0111\u00e0n tr\u1eafng v\u00e0 B\u1ea1ch \u0111\u00e0n n\u00e2u l\u00e0 hai lo\u00e0i c\u00e2y tr\u1ed3ng r\u1eebng ch\u00ednh \u1edf Vi\u1ec7t Nam \u0111\u1ec3 s\u1ea3n xu\u1ea5t b\u1ed9t gi\u1ea5y v\u00e1n MDF, v\u00e1n d\u0103m v\u00e0 g\u1ed7 x\u1ebb.T\u1eeb cu\u1ed1i n\u0103m 1980, b\u1ec7nh \u0111\u1ed1m l\u00e1, ch\u00e1y ng\u1ecdn d\u1eabn \u0111\u1ebfn ch\u1ebft ng\u01b0\u1ee3c c\u00e1c lo\u00e0i b\u1ea1ch \u0111\u00e0n x\u1ea3y ra \u1edf nhi\u1ec1u n\u01a1i. C\u00e1c b\u1ec7nh h\u1ea1i ch\u00ednh \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh l\u00e0: Cryptosporiopsis eucalypti<\/em>, Cylindrocladium reteaudii<\/em> (Cylindrocladium<\/em> quinqueseptatum<\/em>), Mycosphaerella<\/em> spp., Teratosphaeria destructans<\/em> (Kirramyces destructans<\/em>), Ralstonia solanacearum<\/em> v\u00e0 Chrysoporthe cubensis. <\/em>Ch\u01b0\u01a1ng tr\u00ecnh ch\u1ecdn gi\u1ed1ng kh\u00e1ng b\u1ec7nh \u1edf Vi\u1ec7t Nam \u0111\u01b0\u1ee3c b\u1eaft \u0111\u1ea7u t\u1eeb n\u0103m 1996. Ch\u1ecdn c\u00e2y tr\u1ed9i v\u1edbi ti\u00eau chu\u1ea9n sinh tr\u01b0\u1edfng nhanh, kh\u00f4ng b\u1ecb b\u1ec7nh \u1edf r\u1eebng tr\u1ed3ng, khu kh\u1ea3o nghi\u1ec7m h\u1eadu th\u1ebf, xu\u1ea5t x\u1ee9. D\u1eabn gi\u1ed1ng c\u00e1c c\u00e2y tr\u1ed9i tuy\u1ec3n ch\u1ecdn b\u1eb1ng ph\u01b0\u01a1ng ph\u00e1p v\u00f4 t\u00ednh. C\u00e1c d\u00f2ng v\u00f4 t\u00ednh \u0111\u01b0\u1ee3c kh\u1ea3o nghi\u1ec7m t\u1ea1i nh\u1eefng v\u00f9ng c\u00f3 nguy c\u01a1 m\u1eafc b\u1ec7nh cao. Ph\u00e2n c\u1ea5p b\u1ec7nh, \u0111o sinh tr\u01b0\u1edfng \u0111\u1ed1i v\u1edbi c\u00e1c d\u00f2ng \u0111\u01b0\u1ee3c ti\u1ebfn h\u00e0nh h\u00e0ng n\u0103m v\u00e0o cu\u1ed1i m\u00f9a kh\u00f4, th\u00e1ng 11 ho\u1eb7c th\u00e1ng 12. C\u00e1c d\u00f2ng c\u00f3 ch\u1ec9 s\u1ed1 b\u1ec7nh th\u1ea5p, sinh tr\u01b0\u1edfng nhanh, h\u00ecnh d\u00e1ng th\u00e2n th\u1eb3ng \u0111\u01b0\u1ee3c ch\u1ecdn l\u00e0 gi\u1ed1ng ti\u1ebfn b\u1ed9 k\u1ef9 thu\u1eadt \u0111\u1ec3 tr\u1ed3ng r\u1eebng quy m\u00f4 l\u1edbn. Hai d\u00f2ng (SM51 v\u00e0 SM55) c\u00f3 l\u01b0\u1ee3ng t\u0103ng tr\u01b0\u1edfng h\u00e0ng n\u0103m cao h\u01a1n 20 m3<\/sup>\/ha\/n\u0103m, ch\u1ec9 s\u1ed1 b\u1ec7nh nh\u1ecf h\u01a1n 0,31 t\u1eeb kh\u1ea3o nghi\u1ec7m t\u1ea1i S\u00f4ng M\u00e2y, \u0110\u1ed3ng Nai \u0111\u01b0\u1ee3c c\u00f4ng nh\u1eadn l\u00e0 gi\u1ed1ng ti\u1ebfn b\u1ed9 k\u1ef9 thu\u1eadt n\u0103m 2010. Ba d\u00f2ng (B28,B32 v\u00e0 B34) c\u00f3 l\u01b0\u1ee3ng t\u0103ng tr\u01b0\u1edfng h\u00e0ng n\u0103m cao h\u01a1n 26 m3<\/sup>\/ha\/n\u0103m, ch\u1ec9 s\u1ed1 b\u1ec7nh nh\u1ecf h\u01a1n 0,30 t\u1eeb kh\u1ea3o nghi\u1ec7m t\u1ea1i Minh \u0110\u1ee9c, B\u00ecnh Ph\u01b0\u1edbc \u0111\u01b0\u1ee3c c\u00f4ng nh\u1eadn l\u00e0 gi\u1ed1ng ti\u1ebfn b\u1ed9 k\u1ef9 thu\u1eadt n\u0103m 2010.<\/p>\n

T\u1eeb kh\u00f3a:<\/strong> B\u1ea1ch \u0111\u00e0n, \u0110\u00f4ng Nam B\u1ed9, kh\u00e1ng b\u1ec7nh, n\u0103ng su\u1ea5t cao.<\/p>\n

M\u1ede \u0110\u1ea6U<\/strong><\/p>\n

Gi\u1ed1ng l\u00e0 m\u1ed9t trong nh\u1eefng kh\u00e2u quan tr\u1ecdng nh\u1ea5t c\u1ee7a tr\u1ed3ng r\u1eebng \u0111\u1eb7c bi\u1ec7t l\u00e0 r\u1eebng tr\u1ed3ng s\u1ea3n xu\u1ea5t. Kh\u00f4ng c\u00f3 gi\u1ed1ng \u0111\u01b0\u1ee3c c\u1ea3i thi\u1ec7n theo m\u1ee5c ti\u00eau kinh t\u1ebf th\u00ec kh\u00f4ng th\u1ec3 \u0111\u01b0a n\u0103ng su\u1ea5t r\u1eebng tr\u1ed3ng l\u00ean cao. V\u00ec th\u1ebf, c\u1ea3i thi\u1ec7n gi\u1ed1ng c\u00e2y r\u1eebng nh\u1eb1m kh\u00f4ng ng\u1eebng n\u00e2ng cao n\u0103ng su\u1ea5t, ch\u1ea5t l\u01b0\u1ee3ng g\u1ed7 v\u00e0 c\u00e1c s\u1ea3n ph\u1ea9m mong mu\u1ed1n kh\u00e1c l\u00e0 m\u1ed9t y\u00eau c\u1ea7u c\u1ea5p b\u00e1ch \u0111\u1ed1i v\u1edbi s\u1ea3n xu\u1ea5t l\u00e2m nghi\u1ec7p \u1edf n\u01b0\u1edbc ta. Hi\u1ec7n nay m\u1ed9t s\u1ed1 n\u01b0\u1edbc c\u00f3 n\u1ec1n l\u00e2m nghi\u1ec7p ti\u00ean ti\u1ebfn \u0111\u00e3 t\u1ea1o \u0111\u01b0\u1ee3c n\u0103ng su\u1ea5t r\u1eebng tr\u1ed3ng 40 -50 m3<\/sup>\/ha\/n\u0103m tr\u00ean di\u1ec7n r\u1ed9ng, c\u00f3 n\u01a1i \u0111\u00e3 \u0111\u1ea1t n\u0103ng su\u1ea5t 60 – 70 m3<\/sup>\/ha\/n\u0103m. G\u1ea7n \u0111\u00e2y, v\u1edbi vi\u1ec7c \u0111\u01b0a m\u1ed9t s\u1ed1 gi\u1ed1ng Keo lai v\u00e0 b\u1ea1ch \u0111\u00e0n cao s\u1ea3n v\u00e0o s\u1ea3n xu\u1ea5t, m\u1ed9t s\u1ed1 n\u01a1i \u0111\u00e3 \u0111\u1ea1t n\u0103ng su\u1ea5t r\u1eebng tr\u1ed3ng 30 – 40 m3<\/sup>\/ha\/n\u0103m, m\u1edf ra tri\u1ec3n v\u1ecdng m\u1edbi cho c\u00f4ng t\u00e1c gi\u1ed1ng v\u00e0 tr\u1ed3ng r\u1eebng s\u1ea3n xu\u1ea5t \u1edf n\u01b0\u1edbc ta.<\/p>\n

Tuy nhi\u00ean khi di\u1ec7n t\u00edch r\u1eebng tr\u1ed3ng sa\u0309n xu\u00e2\u0301t t\u0103ng l\u00ean d\u1eabn \u0111\u1ebfn kh\u1ea3 n\u0103ng xu\u1ea5t hi\u1ec7n c\u00e1c lo\u00e0i b\u00ea\u0323nh ha\u0323i t\u0103ng theo l\u00e0m gi\u1ea3m n\u0103ng su\u1ea5t v\u00e0 ch\u1ea5t l\u01b0\u1ee3ng r\u1eebng tr\u1ed3ng. T\u1eeb cu\u1ed1i nh\u1eefng n\u0103m 1980, \u0111\u1ea7u nh\u1eefng n\u0103m 1990, d\u1ecbch b\u1ec7nh ch\u00e1y l\u00e1, ch\u1ebft ng\u1ecdn \u0111\u00e3 xu\u1ea5t hi\u1ec7n tr\u00ean di\u1ec7n r\u1ed9ng \u0111\u1ed1i v\u1edbi m\u1ed9t s\u1ed1 lo\u00e0i b\u1ea1ch \u0111\u00e0n \u0111\u00e3 l\u00e0 m\u1ed1i \u0111e d\u1ecda l\u1edbn cho c\u00e1c nh\u00e0 tr\u1ed3ng r\u1eebng tr\u00ean c\u1ea3 n\u01b0\u1edbc, \u0111\u1eb7c bi\u1ec7t l\u00e0 v\u00f9ng \u0110\u00f4ng Nam B\u1ed9 v\u00e0 mi\u1ec1n Trung (g\u1ed3m c\u00e1c t\u1ec9nh Qu\u1ea3ng Nam, \u0110\u00e0 N\u1eb5ng v\u00e0 Th\u1eeba Thi\u00ean Hu\u1ebf). C\u00e1c m\u1ea7m b\u1ec7nh \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh l\u00e0: Cryptosporiopsis eucalypti<\/em>, Cylindrocladium reteaudii<\/em> (Cylindrocladium<\/em> quinqueseptatum<\/em>), Mycosphaerella<\/em> spp., Teratosphaeria destructans<\/em> (Kirramyces destructans<\/em>), Ralstonia solanacearum<\/em> v\u00e0 Chrysoporthe cubensis<\/em>. K\u1ebft qu\u1ea3 \u0111i\u1ec1u tra, \u0111\u00e1nh gi\u00e1 c\u1ee7a c\u00e1c t\u00e1c gi\u1ea3 nh\u01b0 Nguy\u1ec5n Ho\u00e0ng Ngh\u0129a (1992), Sharma (1994) v\u00e0 Old v\u00e0 Yuan (1995) cho th\u1ea5y di\u1ec7n t\u00edch r\u1eebng b\u1ea1ch \u0111\u00e0n b\u1ecb b\u1ec7nh l\u00ean t\u1edbi 50% t\u1ed5ng di\u1ec7n t\u00edch (kho\u1ea3ng 174.000 ha) v\u1edbi c\u00e1c m\u1ee9c \u0111\u1ed9 h\u1ea1i kh\u00e1c nhau v\u00e0 \u0111\u1ec1u c\u1ea3nh b\u00e1o nguy c\u01a1 g\u00e2y h\u1ea1i l\u1edbn \u0111\u1ed1i v\u1edbi r\u1eebng tr\u1ed3ng t\u1eadp trung. V\u00ec v\u1eady vi\u1ec7c tuy\u1ec3n ch\u1ecdn c\u00e1c d\u00f2ng ch\u1ed1ng ch\u1ecbu b\u1ec7nh l\u00e0 m\u1ed9t nhu c\u1ea7u c\u1ea5p thi\u1ebft.<\/p>\n

(T\u1ea1p ch\u00ed Khoa h\u1ecdc L\u00e2m nghi\u1ec7p, s\u1ed1 1 n\u0103m 2011, trang 1697-1703) <\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

\nCh\u01b0\u01a1ng trình ch\u1ecdn gi\u1ed1ng kháng b\u1ec7nh \u1edf Vi\u1ec7t Nam \u0111\u01b0\u1ee3c b\u1eaft \u0111\u1ea7u t\u1eeb n\u0103m 1996. Ch\u1ecdn cây tr\u1ed9i v\u1edbi tiêu chu\u1ea9n sinh tr\u01b0\u1edfng nhanh, không b\u1ecb b\u1ec7nh \u1edf r\u1eebng tr\u1ed3ng, khu kh\u1ea3o nghi\u1ec7m h\u1eadu th\u1ebf, xu\u1ea5t x\u1ee9. D\u1eabn gi\u1ed1ng các cây tr\u1ed9i tuy\u1ec3n ch\u1ecdn b\u1eb1ng ph\u01b0\u01a1ng pháp vô tính. Các dòng vô tính \u0111\u01b0\u1ee3c kh\u1ea3o nghi\u1ec7m t\u1ea1i nh\u1eefng vùng có nguy c\u01a1 m\u1eafc b\u1ec7nh cao. Phân c\u1ea5p b\u1ec7nh, \u0111o sinh tr\u01b0\u1edfng \u0111\u1ed1i v\u1edbi các dòng \u0111\u01b0\u1ee3c ti\u1ebfn hành hàng n\u0103m vào cu\u1ed1i mùa khô, tháng 11 ho\u1eb7c tháng 12. Các dòng có ch\u1ec9 s\u1ed1 b\u1ec7nh th\u1ea5p, sinh tr\u01b0\u1edfng nhanh, hình dáng thân th\u1eb3ng \u0111\u01b0\u1ee3c ch\u1ecdn là gi\u1ed1ng ti\u1ebfn b\u1ed9 k\u1ef9 thu\u1eadt \u0111\u1ec3 tr\u1ed3ng r\u1eebng quy mô l\u1edbn. <\/span><\/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\/9572"}],"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=9572"}],"version-history":[{"count":3,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts\/9572\/revisions"}],"predecessor-version":[{"id":15262,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts\/9572\/revisions\/15262"}],"wp:attachment":[{"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/media?parent=9572"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/categories?post=9572"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/tags?post=9572"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}