{"id":8560,"date":"2009-03-24T02:11:50","date_gmt":"2009-03-23T19:11:50","guid":{"rendered":"http:\/\/vafs.gov.vn\/vn\/2009\/03\/chon-giong-tech-cho-vung-dong-nam-bo-va-tay-nguyen\/"},"modified":"2019-09-25T10:27:54","modified_gmt":"2019-09-25T03:27:54","slug":"chon-giong-tech-cho-vung-dong-nam-bo-va-tay-nguyen","status":"publish","type":"post","link":"https:\/\/vafs.gov.vn\/vn\/chon-giong-tech-cho-vung-dong-nam-bo-va-tay-nguyen\/","title":{"rendered":"Ch\u1ecdn gi\u1ed1ng t\u1ebfch cho v\u00f9ng \u0110\u00f4ng Nam B\u1ed9 v\u00e0 T\u00e2y Nguy\u00ean"},"content":{"rendered":"

Tr\u1ea7n V\u0103n S\u00e2m<\/strong> <\/em><\/p>\n

Trung t\u00e2m KHSXLN \u0110\u00f4ng <\/em>Nam<\/em>b\u1ed9<\/em><\/p>\n

Di\u1ec7n t\u00edch r\u1eebng t\u1ef1 nhi\u00ean \u1edf n\u01b0\u1edbc ta ng\u00e0y c\u00e0ng b\u1ecb thu h\u1eb9p do nhi\u1ec1u nguy\u00ean nh\u00e2n kh\u00e1c nhau, v\u00ec v\u1eady c\u00f4ng t\u00e1c tr\u1ed3ng l\u1ea1i r\u1eebng c\u00f3 m\u1ed9t t\u1ea7m quan tr\u1ecdng \u0111\u1eb7c bi\u1ec7t v\u00e0 r\u1ea5t c\u1ea5p b\u00e1ch. Ngo\u00e0i nh\u1eefng c\u00e2y b\u1ea3n \u0111\u1ecba truy\u1ec1n th\u1ed1ng \u0111\u01b0\u1ee3c nh\u00e2n d\u00e2n ta tr\u1ed3ng nh\u01b0 tre, th\u00f4ng, sao d\u1ea7u \u2026 n\u01b0\u1edbc ta c\u00f2n nh\u1eadp m\u1ed9t s\u1ed1 lo\u00e0i c\u00e2y c\u00f3 ngu\u1ed3n g\u1ed1c t\u1eeb n\u01b0\u1edbc ngo\u00e0i, trong \u0111\u00f3 c\u00f3 c\u00e2y T\u1ebfch (Tectona grandis<\/em>).<\/p>\n

C\u00e2y t\u1ebfch l\u00e0 c\u00e2y g\u1ed7 l\u1edbn, m\u1ecdc t\u01b0\u01a1ng \u0111\u1ed1i nhanh, c\u00f3 bi\u00ean \u0111\u1ed9 sinh th\u00e1i kh\u00ed h\u1eadu kh\u00e1 r\u1ed9ng, ph\u00e2n b\u1ed1 t\u1ef1 nhi\u00ean \u1edf nhi\u1ec1u n\u01b0\u1edbc nh\u01b0 \u1ea5n \u0110\u1ed9, Myanma, Th\u00e1i Lan, L\u00e0o. G\u1ed7 T\u1ebfch c\u00f3 nhi\u1ec1u c\u00f4ng d\u1ee5ng nh\u01b0 \u0111\u00f3ng thuy\u1ec1n, l\u00e0m \u0111\u1ed3 gia d\u1ee5ng \u2026 \u0110\u1eb7c bi\u1ec7t, g\u1ed7 t\u1ebfch c\u00f3 gi\u00e1 tr\u1ecb xu\u1ea5t kh\u1ea9u cao n\u00ean c\u00e2y t\u1ebfch \u0111\u01b0\u1ee3c \u0111\u01b0a v\u00e0o tr\u1ed3ng \u1edf n\u01b0\u1edbc ta kh\u00e1 s\u1edbm (kho\u1ea3ng t\u1eeb n\u0103m 1930 – 1940) v\u00e0 tr\u1ed3ng \u1edf nhi\u1ec1u n\u01a1i nh\u01b0 T\u00e2y Ninh, B\u00ecnh D\u01b0\u01a1ng, B\u00ecnh Ph\u01b0\u1edbc, \u0110\u1ed3ng Nai, \u0110\u1eafc L\u1eafc, H\u00e0 N\u1ed9i, S\u01a1n La, Lai Ch\u00e2u, Tuy\u00ean Quang, B\u1eafc C\u1ea1n,\u2026 Ng\u00e0y nay, kho\u1ea3ng 4.200ha r\u1eebng T\u1ebfch \u0111\u01b0\u1ee3c tr\u1ed3ng t\u1eadp trung \u1edf v\u00f9ng \u0110\u00f4ng Namb\u1ed9 v\u00e0 T\u00e2y Nguy\u00ean.<\/p>\n

Tuy nhi\u00ean, tr\u01b0\u1edbc \u0111\u00e2y do ch\u01b0a \u0111\u01b0\u1ee3c ch\u00fa tr\u1ecdng v\u00e0 \u0111\u1ea7u t\u01b0 th\u00edch \u0111\u00e1ng v\u1ec1 c\u00f4ng t\u00e1c ch\u1ecdn gi\u1ed1ng, c\u00e1c ngu\u1ed3n gi\u1ed1ng cung c\u1ea5p cho tr\u1ed3ng r\u1eebng th\u00ec thu h\u00e1i tr\u00e0n lan, \u0111\u1ed3ng th\u1eddi ch\u01b0a \u00e1p d\u1ee5ng c\u00e1c bi\u1ec7n ph\u00e1p th\u00e2m canh \u0111\u1ed3ng b\u1ed9, n\u00ean n\u0103ng su\u1ea5t r\u1eebng tr\u1ed3ng \u1edf n\u01b0\u1edbc ta c\u00f2n th\u1ea5p (9 – 12m3<\/sup>\/ha\/ n\u0103m) v\u00e0 ch\u1ea5t l\u01b0\u1ee3ng r\u1eebng kh\u00f4ng \u0111\u1ed3ng \u0111\u1ec1u. \u0110\u1ec3 kh\u1eafc ph\u1ee5c m\u1ed9t ph\u1ea7n nh\u1eefng t\u1ed3n t\u1ea1i nh\u1eb1m n\u00e2ng cao ph\u1ea9m ch\u1ea5t gi\u1ed1ng c\u00e2y r\u1eebng, Trung t\u00e2m KHSXLN \u0110\u00f4ng Nam b\u1ed9 \u0111\u00e3 th\u1ef1c hi\u1ec7n \u0110\u1ec1 t\u00e0i nghi\u00ean c\u1ee9u “Ch\u1ecdn gi\u1ed1ng T\u1ebfch cho v\u00f9ng \u0110\u00f4ng Nam b\u1ed9 v\u00e0 T\u00e2y Nguy\u00ean” v\u1edbi c\u00e1c m\u1ee5c ti\u00eau ch\u1ee7 y\u1ebfu c\u1ee7a n\u00f3 l\u00e0 c\u00e2y tr\u1ed9i v\u00e0 x\u00e2y d\u1ef1ng c\u00e1c v\u01b0\u1eddn gi\u1ed1ng t\u1ebfch cho 2 v\u00f9ng n\u00f3i tr\u00ean.<\/p>\n

I. Ph\u01b0\u01a1ng ph\u00e1p nghi\u00ean c\u1ee9u<\/p>\n

1.1 Ph\u01b0\u01a1ng ph\u00e1p b\u1ed1 tr\u00ed th\u00ed nghi\u1ec7m<\/em><\/p>\n

* V\u01b0\u1eddn gi\u1ed1ng t\u1eeb c\u00e2y gh\u00e9p: <\/em>B\u1ed1 tr\u00ed theo ki\u1ec3u ng\u1eabu nhi\u00ean \u0111\u1ea7y \u0111\u1ee7. \u1edf B\u1ea7u B\u00e0ng c\u00f3 3 l\u1ea7n l\u1eb7p l\u1ea1i; m\u1ed7i l\u1eb7p c\u00f3 5 kh\u1ed1i, m\u1ed7i kh\u1ed1i c\u00f3 24 \u00f4 v\u00e0 m\u1ed7i \u00f4 c\u00f3 m\u1ed9t c\u00e2y (d\u00f2ng c\u00e2y tr\u1ed9i). \u1edfKon H\u00e0 N\u1eebng c\u00f3 4 kh\u1ed1i l\u1eb7p l\u1ea1i v\u00e0 m\u1ed7i kh\u1ed1i c\u00f3 25 \u00f4, m\u1ed7i \u00f4 c\u00f3 1 c\u00e2y.<\/p>\n

* V\u01b0\u1eddn gi\u1ed1ng c\u00e2y t\u1eeb h\u1ea1t:<\/em>B\u1ed1 tr\u00ed theo ki\u1ec3u Alpha design, c\u00f3 15 l\u1ea7n l\u1eb7p l\u1ea1i, m\u1ed7i l\u1eb7p c\u00f3 24 \u00f4 v\u00e0 m\u1ed7i \u00f4 c\u00f3 1 c\u00e2y.<\/p>\n

* Gi\u00e2m hom: <\/em>M\u1ed7i th\u00ed nghi\u1ec7m \u0111\u01b0\u1ee3c b\u1ed1 tr\u00ed c\u00f3 3 l\u1ea7n l\u1eb7p l\u1ea1i (3 khay), m\u1ed7i l\u1ea7n l\u1eb7p l\u1ea1i c\u00f3 30 hom. C\u00f3 l\u1eb7p l\u1ea1i theo th\u1eddi gian 2 l\u1ea7n cho m\u1ed7i th\u00ed nghi\u1ec7m. T\u1ea5t c\u1ea3 c\u00e1c th\u00ed nghi\u1ec7m \u0111\u01b0\u1ee3c ti\u1ebfn h\u00e0nh d\u01b0\u1edbi ch\u1ebf \u0111\u1ed9 phun s\u01b0\u01a1ng trong nh\u00e0 k\u00ednh.<\/p>\n

1.2 Ph\u01b0\u01a1ng ph\u00e1p thu th\u1eadp s\u1ed1 li\u1ec7u<\/em><\/p>\n

D\u00f9ng c\u00e1c d\u1ee5ng c\u1ee5 \u0111o nh\u01b0 s\u00e0o \u0111o cao, th\u01b0\u1edbc d\u00e2y \u0111o \u0111\u01b0\u1eddng k\u00ednh.<\/p>\n

\u0110o \u0111\u1ebfm \u0111\u01b0\u1eddng k\u00ednh \u0111\u01b0\u1eddng k\u00ednh g\u1ed1c, chi\u1ec1u cao v\u00fat ng\u1ecdn v\u00e0 c\u00e1c ch\u1ec9 ti\u00eau ch\u1ea5t l\u01b0\u1ee3ng kh\u00e1c c\u1ee7a t\u1ea5t c\u1ea3 c\u00e1c c\u00e2y tr\u1ed3ng th\u00ed nghi\u1ec7m \u1edf trong \u00f4 \u0111\u01b0\u1ee3c ti\u1ebfn h\u00e0nh v\u00e0o th\u00e1ng 12 h\u00e0ng n\u0103m.<\/p>\n

1.3 Ph\u01b0\u01a1ng ph\u00e1p x\u1eed l\u00fd s\u1ed1 li\u1ec7u<\/em><\/p>\n

Sau khi thu th\u1eadp x\u1eed l\u00fd s\u1ed1 li\u1ec7u t\u1ea1i hi\u1ec7n tr\u01b0\u1eddng, ti\u1ebfn h\u00e0nh l\u01b0u tr\u1eef s\u1ed1 li\u1ec7u tr\u00ean m\u00e1y vi t\u00ednh v\u00e0 x\u1eed l\u00fd theo ch\u01b0\u01a1ng tr\u00ecnh ph\u00e2n t\u00edch th\u1ed1ng k\u00ea Stagraphic, Genstat.<\/p>\n

II. \u0110\u1ecba \u0111i\u1ec3m nghi\u00ean c\u1ee9u<\/p>\n

Ti\u1ebfn h\u00e0nh \u0111i\u1ec1u tra \u0111\u1ec3 ch\u1ecdn ra c\u00e1c c\u00e2y tr\u1ed9i \u0111\u1eb7c tr\u01b0ng cho t\u1eebng l\u1eadp \u0111\u1ecba kh\u00e1c nhau \u1edf t\u1ea5t c\u1ea3 c\u00e1c t\u1ec9nh trong v\u00f9ng \u0110\u00f4ng Nam b\u1ed9 v\u00e0 T\u00e2y Nguy\u00ean c\u00f3 di\u1ec7n t\u00edch tr\u1ed3ng t\u1ebfch, sau \u0111\u00f3 b\u1ed1 tr\u00ed th\u00ed nghi\u1ec7m t\u1ea1i 2 \u0111\u1ecba \u0111i\u1ec3m:<\/p>\n

– Tr\u1ea1m Th\u1ef1c nghi\u1ec7m L\u00e2m nghi\u1ec7p B\u1ea7u B\u00e0ng, B\u1ebfn C\u00e1t, B\u00ecnh D\u01b0\u01a1ng: 4 ha<\/p>\n

– Trung t\u00e2m Th\u1ef1c nghi\u1ec7m L\u00e2m nghi\u1ec7p Kon H\u00e0 N\u1eebng, Gia Lai: 1 ha.<\/p>\n

III. K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u<\/p>\n

3.1 Ch\u1ecdn c\u00e2y tr\u1ed9i<\/em><\/p>\n

Ch\u1ecdn c\u00e2y tr\u1ed9i tr\u00ean qui m\u00f4 r\u1ed9ng \u0111\u01b0\u1ee3c ti\u1ebfn h\u00e0nh cho c\u1ea3 2 v\u00f9ng \u0110\u00f4ng Nam b\u1ed9 v\u00e0 T\u00e2y Nguy\u00ean, \u0111\u1eb7c tr\u01b0ng cho t\u1eebng l\u1eadp \u0111\u1ecba kh\u00e1c nhau. K\u1ebft qu\u1ea3 c\u00f3 31 c\u00e2y tr\u1ed9i \u0111\u01b0\u1ee3c ch\u1ecdn v\u00e0 \u1edf nh\u1eefng \u0111\u1ecba \u0111i\u1ec3m nh\u01b0 sau:<\/p>\n

Bi\u1ec3u 1. S\u1ed1 li\u1ec7u \u0111o \u0111\u1ebfm c\u00e2y tr\u1ed9i \u1edf \u0110\u00f4ng Nam b\u1ed9 v\u00e0 T\u00e2y Nguy\u00ean<\/em><\/p>\n\n\n\n\n\n\n\n\n\n\n
\u0110\u1ecba \u0111i\u1ec3m<\/td>\nS\u1ed1 hi\u1ec7u c\u00e2y tr\u1ed9i<\/td>\nD1.3<\/sub> (cm)<\/td>\nH v\u00fat ng\u1ecdn (m)<\/td>\nH d\u01b0\u1edbi c\u00e0nh (m)<\/td>\n<\/tr>\n
C\u00e2y tr\u1ed9i<\/td>\nL\u00e2m ph\u1ea7n<\/td>\n\u0110\u1ed9 v\u01b0\u1ee3t d<\/td>\nC\u00e2y tr\u1ed9i<\/td>\nL\u00e2m ph\u1ea7n<\/td>\n\u0110\u1ed9 v\u01b0\u1ee3t d<\/td>\nC\u00e2y tr\u1ed9i<\/td>\nL\u00e2m ph\u1ea7n<\/td>\n\u0110\u1ed9 v\u01b0\u1ee3t d<\/td>\n<\/tr>\n
X<\/td>\nd<\/td>\nX<\/td>\nd<\/td>\nX<\/td>\nd<\/td>\n<\/tr>\n
\u0110\u1ecbnh Qu\u00e1n<\/td>\n3DQ<\/p>\n

30DQ<\/p>\n

4DQ<\/p>\n

33DQ<\/p>\n

7DQ<\/p>\n

22DQ<\/p>\n

2DQ<\/p>\n

29DQ<\/p>\n

24DQ<\/p>\n

24DQ<\/p>\n

20BD<\/p>\n

5DQ<\/td>\n

63.6<\/p>\n

63.5<\/p>\n

62.1<\/p>\n

61.5<\/p>\n

56.8<\/p>\n

56.0<\/p>\n

55.8<\/p>\n

55.5<\/p>\n

55.0<\/p>\n

54.8<\/p>\n

54.5<\/p>\n

54.1<\/td>\n

45.13<\/p>\n

46.60<\/p>\n

45.13<\/p>\n

49.50<\/p>\n

47.84<\/p>\n

43.08<\/p>\n

45.13<\/p>\n

46.60<\/p>\n

43.08<\/p>\n

43.08<\/p>\n

43.08<\/p>\n

45.13<\/td>\n

5.99<\/p>\n

5.48<\/p>\n

5.99<\/p>\n

6.36<\/p>\n

5.94<\/p>\n

5.99<\/p>\n

5.13<\/p>\n

5.48<\/p>\n

5.99<\/p>\n

5.99<\/p>\n

5.99<\/p>\n

5.13<\/td>\n

3.08<\/p>\n

3.08<\/p>\n

2.83<\/p>\n

1.89<\/p>\n

1.50<\/p>\n

2.16<\/p>\n

2.08<\/p>\n

1.62<\/p>\n

1.99<\/p>\n

1.96<\/p>\n

1.91<\/p>\n

1.75<\/td>\n

27.0<\/p>\n

27.5<\/p>\n

26.5<\/p>\n

28.929.7<\/p>\n

26.4<\/p>\n

26.7<\/p>\n

26.5<\/p>\n

26.4<\/p>\n

29.0<\/p>\n

27.5<\/p>\n

26.0<\/td>\n

24.00<\/p>\n

23.64<\/p>\n

23.49<\/p>\n

21.64<\/p>\n

23.27<\/p>\n

24.00<\/p>\n

23.49<\/p>\n

23.64<\/p>\n

24.00<\/p>\n

24.00<\/p>\n

24.00<\/p>\n

23.49<\/td>\n

1.49<\/p>\n

1.751.79<\/p>\n

3.98<\/p>\n

3.16<\/p>\n

1.49<\/p>\n

1.79<\/p>\n

1.75<\/p>\n

1.49<\/p>\n

1.49<\/p>\n

1.49<\/p>\n

1.79<\/td>\n

2.01<\/p>\n

2.21<\/p>\n

1.68<\/p>\n

1.82<\/p>\n

2.04<\/p>\n

1.61<\/p>\n

1.79<\/p>\n

1.63<\/p>\n

1.61<\/p>\n

3.36<\/p>\n

2.35<\/p>\n

1.40<\/td>\n

13.5<\/p>\n

13.5<\/p>\n

14.0<\/p>\n

14.5<\/p>\n

14.2<\/p>\n

14.013.3<\/p>\n

14.8<\/p>\n

13.5<\/p>\n

15.2<\/p>\n

15.0<\/p>\n

15.0<\/td>\n

11.76<\/p>\n

11.42<\/p>\n

11.89<\/p>\n

12.56<\/p>\n

11.96<\/p>\n

12.76<\/p>\n

11.89<\/p>\n

11.24<\/p>\n

12.76<\/p>\n

12.76<\/p>\n

12.76<\/p>\n

11.89<\/td>\n

2.19<\/p>\n

1.79<\/p>\n

1.88<\/p>\n

2.32<\/p>\n

1.94<\/p>\n

2.19<\/p>\n

1.88<\/p>\n

1.79<\/p>\n

2.19<\/p>\n

2.192.19<\/p>\n

1.88<\/td>\n

0.80<\/p>\n

1.16<\/p>\n

1.12<\/p>\n

0.84<\/p>\n

1.16<\/p>\n

0.57<\/p>\n

0.75<\/p>\n

1.88<\/p>\n

0.34<\/p>\n

1.11<\/p>\n

1.02<\/p>\n

1.65<\/td>\n<\/tr>\n

La Ng\u00e0<\/td>\n35LN<\/p>\n

S3LN<\/p>\n

34LN<\/p>\n

S2LN<\/p>\n

36LN<\/p>\n

45LN<\/p>\n

S1LN<\/p>\n

48LN<\/p>\n

43Ln<\/p>\n

46LN<\/td>\n

33.7<\/p>\n

33.0<\/p>\n

28.5<\/p>\n

25.8<\/p>\n

25.8<\/p>\n

25.5<\/p>\n

25.3<\/p>\n

25.3<\/p>\n

25.0<\/p>\n

24.4<\/td>\n

20.32<\/p>\n

22.42<\/p>\n

19.16<\/p>\n

19.55<\/p>\n

18.35<\/p>\n

18.16<\/p>\n

17.55<\/p>\n

17.66<\/p>\n

18.16<\/p>\n

17.04<\/td>\n

4.91<\/p>\n

4.15<\/p>\n

3.95<\/p>\n

4.13<\/p>\n

4.67<\/p>\n

4.45<\/p>\n

3.00<\/p>\n

3.50<\/p>\n

4.45<\/p>\n

3.89<\/td>\n

2.73<\/p>\n

2.55<\/p>\n

2.25<\/p>\n

1.51<\/p>\n

1.60<\/p>\n

1.65<\/p>\n

2.03<\/p>\n

2.18<\/p>\n

1.54<\/p>\n

1.90<\/td>\n

19.0<\/p>\n

20.8<\/p>\n

22.5<\/p>\n

19.0<\/p>\n

19.0<\/p>\n

19.5<\/p>\n

22.0<\/p>\n

18.5<\/p>\n

20.0<\/p>\n

19.0<\/td>\n

15.47<\/p>\n

16.40<\/p>\n

15.30<\/p>\n

15.19<\/p>\n

14.56<\/p>\n

16.22<\/p>\n

16.70<\/p>\n

13.64<\/p>\n

16.22<\/p>\n

14.12<\/td>\n

2.34<\/p>\n

2.79<\/p>\n

3.09<\/p>\n

2.55<\/p>\n

3.04<\/p>\n

2.15<\/p>\n

3.19<\/p>\n

2.29<\/p>\n

2.15<\/p>\n

1.68<\/td>\n

1.51<\/p>\n

1.58<\/p>\n

2.33<\/p>\n

1.50<\/p>\n

1.46<\/p>\n

1.53<\/p>\n

1.66<\/p>\n

2.12<\/p>\n

1.76<\/p>\n

2.90<\/td>\n

9.7<\/p>\n

10.6<\/p>\n

12.4<\/p>\n

9.5<\/p>\n

10.5<\/p>\n

11.4<\/p>\n

12.0<\/p>\n

9.4<\/p>\n

13.1<\/p>\n

12.0<\/td>\n

7.22<\/p>\n

7.84<\/p>\n

7.82<\/p>\n

6.48<\/p>\n

6.57<\/p>\n

7.86<\/p>\n

8.15<\/p>\n

7.08<\/p>\n

7.86<\/p>\n

6.66<\/td>\n

2.50<\/p>\n

2.36<\/p>\n

2.40<\/p>\n

2.19<\/p>\n

2.32<\/p>\n

2.37<\/p>\n

2.72<\/p>\n

2.04<\/p>\n

2.37<\/p>\n

1.74<\/td>\n

0.99<\/p>\n

1.17<\/p>\n

1.91<\/p>\n

1.38<\/p>\n

1.69<\/p>\n

1.49<\/p>\n

1.42<\/p>\n

1.14<\/p>\n

2.21<\/p>\n

3.07<\/td>\n<\/tr>\n

L\u1ed9c Quang<\/td>\n1LQ<\/p>\n

2LQ<\/p>\n

3LQ<\/p>\n

4LQ<\/td>\n

58.0<\/p>\n

56.5<\/p>\n

28.0<\/p>\n

27.6<\/td>\n

48.48<\/p>\n

48.48<\/p>\n

27.03<\/p>\n

23.03<\/td>\n

5.36<\/p>\n

5.36<\/p>\n

2.94<\/p>\n

2.94<\/td>\n

1.78<\/p>\n

1.50<\/p>\n

1.69<\/p>\n

1.55<\/td>\n

25.5<\/p>\n

24.6<\/p>\n

21.9<\/p>\n

19.8<\/td>\n

18.78<\/p>\n

18.78<\/p>\n

17.13<\/p>\n

17.13<\/td>\n

2.68<\/p>\n

2.68<\/p>\n

1.83<\/p>\n

1.83<\/td>\n

2.51<\/p>\n

2.17<\/p>\n

2.61<\/p>\n

1.46<\/td>\n

15.0<\/p>\n

12.8<\/p>\n

13.6<\/p>\n

12.2<\/td>\n

7.93<\/p>\n

7.93<\/p>\n

8.75<\/p>\n

8.75<\/td>\n

2.16<\/p>\n

2.16<\/p>\n

1.90<\/p>\n

1.90<\/td>\n

3.27<\/p>\n

3.26<\/p>\n

2.55<\/p>\n

1.82<\/td>\n<\/tr>\n

Eakm\u00e1t<\/td>\n2EAK<\/p>\n

1EAK<\/td>\n

44.0<\/p>\n

42.8<\/td>\n

29.52<\/p>\n

28.44<\/td>\n

5.50<\/p>\n

5.39<\/td>\n

2.63<\/p>\n

2.66<\/td>\n

28.5<\/p>\n

26.5<\/td>\n

21.29<\/p>\n

22.83<\/td>\n

2.52<\/p>\n

2.30<\/td>\n

2.86<\/p>\n

1.60<\/td>\n

15.0<\/p>\n

14.9<\/td>\n

10.60<\/p>\n

12.84<\/td>\n

1.85<\/p>\n

3.54<\/td>\n

2.37<\/p>\n

0.58<\/td>\n<\/tr>\n

M\u00e3 \u0110\u00e0<\/td>\n3MD<\/p>\n

1MD<\/p>\n

2MD<\/td>\n

27.9<\/p>\n

27.0<\/p>\n

24.2<\/td>\n

18.60<\/p>\n

16.82<\/p>\n

16.82<\/td>\n

3.02<\/p>\n

3.57<\/p>\n

3.57<\/td>\n

3.08<\/p>\n

2.86<\/p>\n

2.07<\/td>\n

20.8<\/p>\n

20.7<\/p>\n

20.5<\/td>\n

17.10<\/p>\n

15.97<\/p>\n

15.97<\/td>\n

2.04<\/p>\n

2.97<\/p>\n

2.97<\/td>\n

1.81<\/p>\n

1.59<\/p>\n

1.52<\/td>\n

13.0<\/p>\n

13.7<\/p>\n

13.9<\/td>\n

11.03<\/p>\n

11.00<\/p>\n

11.00<\/td>\n

1.85<\/p>\n

2.49<\/p>\n

2.49<\/td>\n

1.07<\/p>\n

1.08<\/p>\n

1.16<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

3.2 V\u01b0\u1eddn gi\u1ed1ng t\u1ea1o t\u1eeb c\u00e2y gh\u00e9p <\/em><\/p>\n

a. V\u01b0\u1eddn gi\u1ed1ng t\u1ea1o t\u1eeb c\u00e2y gh\u00e9p t\u1ea1i B\u1ea7u B\u00e0ng<\/em><\/p>\n

* V\u1ec1 \u0111\u01b0\u1eddng k\u00ednh g\u1ed1c:<\/p>\n

Ch\u01b0a c\u00f3 s\u1ef1 sai kh\u00e1c l\u1edbn gi\u1eefa c\u00e1c d\u00f2ng v\u1ec1 \u0111\u01b0\u1eddng k\u00ednh g\u1ed1c khi c\u00e2y \u1edf tu\u1ed5i 3. D\u00f2ng 04 DQ, 01 MD v\u00e0 34 LN c\u00f3 \u0111\u01b0\u1eddng k\u00ednh g\u1ed1c trung b\u00ecnh nh\u1ecf nh\u1ea5t (6,10cm; 6,40cm; 6,42cm) v\u00e0 d\u00f2ng 24 QD c\u00f3 \u0111\u01b0\u1eddng k\u00ednh g\u1ed1c trung b\u00ecnh l\u1edbn nh\u1ea5t (9,537cm). S\u1ef1 ch\u00eanh l\u1ec7ch \u0111\u01b0\u1eddng k\u00ednh gi\u1eefa d\u00f2ng l\u1edbn nh\u1ea5t v\u00e0 d\u00f2ng nh\u1ecf nh\u1ea5t l\u00e0 3,437cm hay 56,34%.<\/p>\n

* V\u1ec1 chi\u1ec1u cao:<\/p>\n

C\u00f3 s\u1ef1 sai kh\u00e1c gi\u1eefa c\u00e1c d\u00f2ng v\u1edbi nhau. D\u00f2ng 34 LN (H=”2,440m)” v\u00e0 d\u00f2ng 04 DQ (H=”2,114m)” c\u00f3 chi\u1ec1u cao trung b\u00ecnh th\u1ea5p nh\u1ea5t, hai d\u00f2ng c\u00f3 chi\u1ec1u cao l\u1edbn nh\u1ea5t l\u00e0 d\u00f2ng 22 DQ (H= 3,960m) v\u00e0 d\u00f2ng 03 MD (H=”2,917m).” S\u1ef1 ch\u00eanh l\u1ec7ch gi\u1eefa d\u00f2ng tr\u1ed9i nh\u1ea5t v\u00e0 d\u00f2ng th\u1ea5p nh\u1ea5t l\u00e0 1,846m hay 87,32%.<\/p>\n

b. V\u01b0\u1eddn gi\u1ed1ng t\u1ea1o t\u1eeb c\u00e2y gh\u00e9p t\u1ea1i Kon H\u00e0 N\u1eebng<\/em><\/p>\n

* V\u1ec1 \u0111\u01b0\u1eddng k\u00ednh g\u1ed1c:<\/p>\n

C\u00f3 s\u1ef1 sai kh\u00e1c gi\u1eefa c\u00e1c d\u00f2ng tuy ch\u01b0a ph\u1ea3i l\u00e0 l\u1edbn. D\u00f2ng 02 MD (D= 13,000cm) c\u00f3 \u0111\u01b0\u1eddng k\u00ednh l\u1edbn nh\u1ea5t, d\u00f2ng 04 DQ (D= 9,000cm) c\u00f3 \u0111\u01b0\u1eddng k\u00ednh nh\u1ecf nh\u1ea5t. S\u1ef1 ch\u00eanh l\u1ec7ch gi\u1eefa d\u00f2ng tr\u1ed9i nh\u1ea5t v\u00e0 d\u00f2ng nh\u1ecf nh\u1ea5t l\u00e0 4,000cm hay 44,00%.<\/p>\n

* V\u1ec1 chi\u1ec1u cao:<\/p>\n

Ch\u01b0a c\u00f3 s\u1ef1 ph\u00e2n ho\u00e1 r\u00f5 r\u1ec7t gi\u1eefa c\u00e1c d\u00f2ng. D\u00f2ng 43 LN (H= 7,75m) sinh tr\u01b0\u1edfng cao nh\u1ea5t, d\u00f2ng 24 DQ (H= 5,933m) sinh tr\u01b0\u1edfng th\u1ea5p nh\u1ea5t. S\u1ef1 ch\u00eanh l\u1ec7ch gi\u1eefa d\u00f2ng cao nh\u1ea5t v\u00e0 d\u00f2ng th\u1ea5p nh\u1ea5t v\u1ec1 chi\u1ec1u cao l\u00e0 1,767m hay 29,78%.<\/p>\n

So s\u00e1nh 2 v\u01b0\u1eddn gi\u1ed1ng gh\u00e9p t\u1ea1i B\u1ea7u B\u00e0ng v\u00e0 Hon H\u00e0 N\u1eebng, nh\u1eadn th\u1ea5y r\u1eb1ng: <\/em><\/p>\n

* V\u1ec1 sinh tr\u01b0\u1edfng:<\/em><\/p>\n

– Sinh tr\u01b0\u1edfng gi\u1eefa c\u00e1c d\u00f2ng ch\u01b0a c\u00f3 s\u1ef1 kh\u00e1c bi\u1ec7t \u0111\u00e1ng k\u1ec3, m\u1edbi b\u01b0\u1edbc v\u00e0o giai \u0111o\u1ea1n \u0111\u1ea7u c\u1ee7a s\u1ef1 ph\u00e2n ho\u00e1 gi\u1eefa c\u00e1c d\u00f2ng v\u1edbi nhau. Tuy v\u1eady, v\u1eabn c\u00f3 c\u00e1c d\u00f2ng s\u1edbm bi\u1ec3u hi\u1ec7n t\u00ednh tr\u1ed9i c\u1ee7a ch\u00fang v\u1ec1 \u0111\u01b0\u1eddng k\u00ednh, v\u00e0 v\u1ec1 chi\u1ec1u cao trong 3 n\u0103m \u0111\u1ea7u (d\u00f2ng 22 DQ \u1edf B\u1ea7u B\u00e0ng, d\u00f2ng 01 MD, 43 LN \u1edf Kon H\u00e0 N\u1eebng). C\u00f3 m\u1ed9t s\u1ed1 d\u00f2ng \u0111\u00e3 th\u1ec3 hi\u1ec7n sinh tr\u01b0\u1edfng k\u00e9m h\u01a1n trong 3 n\u0103m \u1edf giai \u0111o\u1ea1n \u0111\u1ea7u v\u00e0 \u1edf c\u1ea3 2 l\u1eadp \u0111\u1ecba kh\u00e1c nhau (B\u1ea7u B\u00e0ng, Kon H\u00e0 N\u1eebng) nh\u01b0 d\u00f2ng 04 DQ v\u1ec1 chi\u1ec1u cao l\u1eabn \u0111\u01b0\u1eddng k\u00ednh.<\/p>\n

– So s\u00e1nh gi\u1eefa sinh tr\u01b0\u1edfng c\u1ee7a c\u00e1c d\u00f2ng tr\u1ed3ng th\u00ed nghi\u1ec7m v\u00e0 bi\u1ec3u ch\u1ecdn c\u00e2y tr\u1ed9i cho th\u1ea5y ch\u01b0a ph\u00e1t hi\u1ec7n \u0111\u01b0\u1ee3c m\u1ed1i quan h\u1ec7 gi\u1eefa sinh tr\u01b0\u1edfng c\u1ee7a h\u1eadu th\u1ebf v\u00f4 t\u00ednh v\u1edbi gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i c\u1ee7a c\u1ee1 k\u00ednh ho\u1eb7c \u0111\u1ed9 v\u01b0\u1ee3t tr\u1ed9i c\u1ee7a ch\u00fang so v\u1edbi b\u00ecnh qu\u00e2n l\u00e2m ph\u1ea7n. Th\u1eadm ch\u00ed, nh\u1eefng c\u00e2y m\u1eb9 c\u00f3 k\u00edch th\u01b0\u1edbc l\u1edbn h\u01a1n nh\u01b0ng khi ki\u1ec3m nghi\u1ec7m h\u1eadu th\u1ebf v\u00f4 t\u00ednh l\u1ea1i nh\u1ecf h\u01a1n, sinh tr\u01b0\u1edfng k\u00e9m h\u01a1n. V\u00ed d\u1ee5 nh\u01b0 d\u00f2ng 04 DQ sinh tr\u01b0\u1edfng k\u00e9m h\u01a1n d\u00f2ng 22 DQ, m\u1eb7c d\u00f9 c\u00e2y m\u1eb9 c\u00f3 D1,3<\/sub>, H v\u00e0 \u0111\u1ed9 v\u01b0\u1ee3t tr\u1ed9i h\u01a1n h\u1eb3n. So s\u00e1nh d\u00f2ng 01 MD v\u1edbi d\u00f2ng 03 MD tr\u1ed3ng t\u1ea1i Kon H\u00e0 N\u1eebng c\u0169ng c\u00f3 nh\u1eadn x\u00e9t t\u01b0\u01a1ng t\u1ef1. Do \u0111\u00f3 c\u1ea7n ti\u1ebfp t\u1ee5c theo d\u00f5i, \u0111o \u0111\u1ebfm, ph\u00e2n t\u00edch v\u01b0\u1eddn gi\u1ed1ng v\u00f4 t\u00ednh \u1edf c\u1ea5p tu\u1ed5i cao h\u01a1n m\u1edbi c\u00f3 nh\u1eadn x\u00e9t ch\u00ednh x\u00e1c \u0111\u01b0\u1ee3c.<\/p>\n

– So s\u00e1nh v\u1ec1 sinh tr\u01b0\u1edfng gi\u1eefa hai v\u01b0\u1eddn gi\u1ed1ng t\u1ea1i B\u1ea7u B\u00e0ng v\u00e0 Kon H\u00e0 N\u1eebng th\u00ec v\u01b0\u1eddn t\u1ebfch v\u00f4 t\u00ednh tr\u1ed3ng th\u00ed nghi\u1ec7m t\u1ea1i Kon H\u00e0 N\u1eebng c\u00f3 \u0111\u01b0\u1eddng k\u00ednh, \u0111\u1eb7c bi\u1ec7t l\u00e0 chi\u1ec1u cao tr\u1ed9i h\u01a1n h\u1eb3n.<\/p>\n

* V\u1ec1 ph\u1ea9m ch\u1ea5t:<\/em><\/p>\n

– C\u00e2y t\u1ebfch tr\u1ed3ng t\u1ea1i Kon H\u00e0 N\u1eebng l\u00ean th\u1eb3ng, \u00edt c\u00e0nh nh\u00e1nh v\u00e0 c\u00f3 s\u1ee9c sinh tr\u01b0\u1edfng t\u1ed1t. C\u00f2n c\u00e2y tr\u1ed3ng t\u1ea1i B\u1ea7u B\u00e0ng th\u00ec ng\u01b0\u1ee3c l\u1ea1i: C\u00e2y c\u00f3 nhi\u1ec1u c\u00e0nh nh\u00e1nh \u0111\u00e2m ngang v\u00e0 l\u1edbn, s\u1ee9c sinh tr\u01b0\u1edfng k\u00e9m, bi\u1ec3u hi\u1ec7n l\u00e0 c\u00e2y ch\u1ebft kh\u00f4 r\u1ea3i r\u00e1c trong v\u01b0\u1eddn. Nh\u01b0 \u0111\u00e3 ph\u00e2n t\u00edch, l\u1eadp \u0111\u1ecba t\u1ea1i B\u1ea7u B\u00e0ng l\u00e0 kh\u00f4ng ph\u00f9 h\u1ee3p v\u1edbi c\u00e1c \u0111\u1eb7c \u0111i\u1ec3m sinh h\u1ecdc c\u1ee7a c\u00e2y t\u1ebfch do \u0111\u00f3 ch\u00fang sinh tr\u01b0\u1edfng k\u00e9m v\u00e0 c\u00f3 d\u1ea5u hi\u1ec7u ch\u1ebft t\u1eeb t\u1eeb. Trong \u0111i\u1ec1u ki\u1ec7n hi\u1ec7n nay ch\u01b0a ph\u1ea3i l\u00e0 tr\u1ec5, ch\u00fang ta c\u1ea7n c\u00f3 bi\u1ec7n ph\u00e1p k\u1ecbp th\u1eddi \u0111\u1ec3 duy tr\u00ec ngu\u1ed3n gen qu\u00fd n\u00e0y b\u1eb1ng c\u00e1ch ch\u1ecdn v\u00f9ng \u0111\u1ea5t m\u1edbi c\u00f3 \u0111\u1eb7c \u0111i\u1ec3m th\u1ed5 nh\u01b0\u1ee1ng th\u00edch h\u1ee3p v\u1edbi \u0111\u1eb7c \u0111i\u1ec3m sinh h\u1ecdc c\u1ee7a c\u00e2y t\u1ebfch \u0111\u1ec3 di chuy\u1ec3n ch\u00fang.<\/p>\n

– Gi\u1eefa chi\u1ec1u cao v\u00e0 \u0111\u01b0\u1eddng k\u00ednh c\u00f3 m\u1ed1i t\u01b0\u01a1ng quan \u0111\u01b0\u1eddng th\u1eb3ng t\u01b0\u01a1ng \u0111\u1ed1i ch\u1eb7t:<\/p>\n

+ T\u1ea1i B\u1ea7u B\u00e0ng: H = 1.262 + 0.260D ( \u1edf 3 tu\u1ed5i) v\u1edbi h\u1ec7 s\u1ed1 t\u01b0\u01a1ng quan R = 0.650<\/p>\n

+ T\u1ea1i Kon H\u00e0 N\u1eebng: H = 3.534 + 0.298 D ( \u1edf 3 tu\u1ed5i) v\u1edbi h\u1ec7 s\u1ed1 t\u01b0\u01a1ng quan R = 0.538<\/p>\n

3.3 V\u01b0\u1eddn gi\u1ed1ng t\u1ebfch tr\u1ed3ng t\u1eeb h\u1ea1t<\/em><\/p>\n

– V\u1ec1 \u0111\u01b0\u1eddng k\u00ednh: <\/em><\/p>\n

Ch\u01b0a c\u00f3 s\u1ef1 sai kh\u00e1c \u0111\u00e1ng k\u1ec3 gi\u1eefa c\u00e1c d\u00f2ng khi c\u00e2y \u0111\u01b0\u1ee3c 2 n\u0103m 6 th\u00e1ng tu\u1ed5i \u1edf B\u1ea7u B\u00e0ng (P =”0.283).” D\u00f2ng 34 LN (D = 9.253cm) c\u00f3 \u0111\u01b0\u1eddng k\u00ednh l\u1edbn nh\u1ea5t, d\u00f2ng S3 LN ( D= 5.781cm) c\u00f3 \u0111\u01b0\u1eddng k\u00ednh nh\u1ecf nh\u1ea5t.<\/p>\n

– V\u1ec1 chi\u1ec1u cao:<\/em><\/p>\n

S\u1ed1 li\u1ec7u cho th\u1ea5y c\u00e1c d\u00f2ng ch\u01b0a c\u00f3 s\u1ef1 sai kh\u00e1c (P = 0.342). D\u00f2ng 24 BDQ c\u00f3 chi\u1ec1u cao l\u1edbn nh\u1ea5t (H= 3.423m), d\u00f2ng 07 DQ (H= 2.423m) c\u00f3 chi\u1ec1u cao th\u1ea5p nh\u1ea5t.<\/p>\n

Nh\u01b0 v\u1eady, v\u01b0\u1eddn t\u1ebfch kh\u1ea3o nghi\u1ec7m h\u1eadu th\u1ebf tr\u1ed3ng \u0111\u01b0\u1ee3c 2 n\u0103m 6 th\u00e1ng tu\u1ed5i t\u1ea1i B\u1ea7u B\u00e0ng ch\u01b0a th\u1ec3 hi\u1ec7n \u0111\u01b0\u1ee3c t\u00ednh tr\u1ed9i do b\u1ed1 m\u1eb9 di truy\u1ec1n l\u1ea1i cho h\u1eadu th\u1ebf sau. C\u1ea7n ti\u1ebfp t\u1ee5c theo d\u00f5i, \u0111o \u0111\u1ebfm, ph\u00e2n t\u00edch l\u00e2u d\u00e0i m\u1edbi c\u00f3 k\u1ebft lu\u1eadn ch\u00ednh x\u00e1c \u0111\u01b0\u1ee3c.<\/p>\n

3.4 Th\u00ed nghi\u1ec7m gi\u00e2m hom t\u1ebfch<\/em><\/p>\n

a. Kh\u1ea3 n\u0103ng ra r\u1ec5 c\u1ee7a hom t\u1ebfch<\/em><\/p>\n

*K\u1ebft qu\u1ea3 th\u00ed nghi\u1ec7m c\u00e1c d\u1ea1ng thu\u1ed1c kh\u00e1c nhau ch\u1ec9 ra \u1edf bi\u1ec3u 2.<\/p>\n

Bi\u1ec3u 2. Kh\u1ea3 n\u0103ng ra r\u1ec5 c\u1ee7a hom t\u1ebfch \u0111\u01b0\u1ee3c x\u1eed l\u00fd tr\u00ean c\u00e1c d\u1ea1ng thu\u1ed1c<\/em><\/p>\n\n\n\n\n\n\n\n
Ch\u1ec9 ti\u00eau nghi\u00ean c\u1ee9u<\/td>\n\u0110\u1ed1i ch\u1ee9ng<\/td>\nD\u1ea1ng b\u1ed9t (%)<\/td>\nD\u1ea1ng dung d\u1ecbch (ppm)<\/td>\n<\/tr>\n
0.5<\/td>\n1.0<\/td>\n1.5<\/td>\n2.0<\/td>\n50<\/td>\n100<\/td>\n200<\/td>\n300<\/td>\n<\/tr>\n
T\u1ef7 l\u1ec7 ra r\u1ec5 (%)<\/td>\n16.60<\/td>\n20<\/td>\n6.7<\/td>\n3.3<\/td>\n0<\/td>\n10<\/td>\n6.7<\/td>\n3.3<\/td>\n3.3<\/td>\n<\/tr>\n
S\u1ed1 l\u01b0\u1ee3ng r\u1ec5 (c\u00e1i)<\/td>\n2.80<\/td>\n3.3<\/td>\n2.0<\/td>\n1.0<\/td>\n–<\/td>\n3.5<\/td>\n3.3<\/td>\n3.0<\/td>\n2.5<\/td>\n<\/tr>\n
Chi\u1ec1u d\u00e0i (cm)<\/td>\n4.05<\/td>\n5.61<\/td>\n1.93<\/td>\n2.40<\/td>\n–<\/td>\n7.16<\/td>\n4.50<\/td>\n2.42<\/td>\n5.04<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

* Nh\u1eadn x\u00e9t<\/p>\n

N\u1ed3ng \u0111\u1ed9 IBA \u1edf d\u1ea1ng b\u1ed9t:<\/p>\n

– D\u00f9ng d\u1ea1ng b\u1ed9t \u0111\u1ec3 x\u1eed l\u00fd hom t\u1ebfch 4 th\u00e1ng tu\u1ed5i cho th\u1ea5y n\u1ed3ng \u0111\u1ed9 0.5% c\u00f3 t\u1ef7 l\u1ec7 ra r\u1ec5 cao nh\u1ea5t l\u00e0 20%, s\u1ed1 l\u01b0\u1ee3ng r\u1ec5 l\u00e0 3.3 c\u00e1i\/ hom v\u00e0 c\u00f3 chi\u1ec1u d\u00e0i trung b\u00ecnh 5.61cm. N\u1ed3ng \u0111\u1ed9 n\u00e0y cho k\u1ebft qu\u1ea3 t\u1ed1t h\u01a1n \u0111\u1ed1i ch\u1ee9ng 20.48%.<\/p>\n

– N\u1ed3ng \u0111\u1ed9 c\u00e0ng t\u0103ng t\u1ef7 l\u1ec7 ra r\u1ec5 c\u00e0ng th\u1ea5p, v\u1edbi n\u1ed3ng \u0111\u1ed9 20% th\u00ec kh\u00f4ng ra r\u1ec5 ho\u00e0n to\u00e0n.<\/p>\n

N\u1ed3ng \u0111\u1ed9 IBA \u1edf d\u1ea1ng dung d\u1ecbch:<\/p>\n

– N\u1ed3ng \u0111\u1ed9 50ppm d\u00f9ng \u0111\u1ec3 x\u1eed l\u00fd hom t\u1ebfch ng\u00e2m trong 3 gi\u1edd cho t\u1ef7 l\u1ec7 10% l\u00e0 cao nh\u1ea5t nh\u01b0ng t\u1ef7 l\u1ec7 n\u00e0y v\u1eabn c\u00f2n th\u1ea5p h\u01a1n \u0111\u1ed1i ch\u1ee9ng 147.76%.<\/p>\n

– T\u01b0\u01a1ng t\u1ef1 nh\u01b0 IBA \u1edf d\u1ea1ng b\u1ed9t, n\u1ed3ng \u0111\u1ed9 dung d\u1ecbch c\u00e0ng cao th\u00ec t\u1ef7 l\u1ec7 ra r\u1ec5 c\u00e0ng th\u1ea5p, s\u1ed1 r\u1ec5 c\u00e0ng \u00edt d\u1ea7n \u0111i.<\/p>\n

b. N\u1ed3ng \u0111\u1ed9 th\u00edch h\u1ee3p nh\u1ea5t \u0111\u1ed1i v\u1edbi hom t\u1ebfch<\/em><\/p>\n

* K\u1ebft qu\u1ea3 th\u00ed nghi\u1ec7m c\u00e1c n\u1ed3ng \u0111\u1ed9 kh\u00e1c nhau ch\u1ec9 ra \u1edf bi\u1ec3u 3.<\/p>\n

Bi\u1ec3u 3. Kh\u1ea3 n\u0103ng ra r\u1ec5 c\u1ee7a hom t\u1ebfch \u0111\u01b0\u1ee3c x\u1eed l\u00fd tr\u00ean c\u00e1c n\u1ed3ng \u0111\u1ed9 kh\u00e1c nhau (d\u1ea1ng b\u1ed9t)<\/em><\/p>\n\n\n\n\n\n\n
Ch\u1ec9 ti\u00eau nghi\u00ean c\u1ee9u<\/td>\n\u0110\u1ed1i ch\u1ee9ng<\/td>\n0.2%<\/td>\n0.4%<\/td>\n0.6%<\/td>\n0.8%<\/td>\n1.0%<\/td>\n<\/tr>\n
T\u1ef7 l\u1ec7 ra r\u1ec5 (%)<\/td>\n13.3<\/td>\n16.6<\/td>\n21.4<\/td>\n22.6<\/td>\n15.7<\/td>\n13.3<\/td>\n<\/tr>\n
S\u1ed1 l\u01b0\u1ee3ng r\u1ec5 (c\u00e1i)<\/td>\n2.76<\/td>\n4.00<\/td>\n3.33<\/td>\n4.30<\/td>\n3.40<\/td>\n2.50<\/td>\n<\/tr>\n
Chi\u1ec1u d\u00e0i (cm)<\/td>\n6.74<\/td>\n5.64<\/td>\n5.68<\/td>\n12.13<\/td>\n9.50<\/td>\n2.07<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

* Nh\u1eadn x\u00e9t:<\/p>\n

– N\u1ed3ng \u0111\u1ed9 0.6% c\u00f3 t\u1ef7 l\u1ec7 ra r\u1ec5 cao nh\u1ea5t (22.6%) v\u00e0 v\u01b0\u1ee3t tr\u1ed9i h\u01a1n \u0111\u1ed1i ch\u1ee9ng l\u00e0 69.92%. \u0110\u00e1ng ch\u00fa \u00fd l\u00e0 chi\u1ec1u d\u00e0i c\u1ee7a r\u1ec5 ph\u00e1t tri\u1ec3n r\u1ea5t t\u1ed1t (12.13 cm), so v\u1edbi \u0111\u1ed1i ch\u1ee9ng d\u00e0i h\u01a1n 77.97%. S\u1ed1 l\u01b0\u1ee3ng r\u1ec5 trung b\u00ecnh l\u00e0 4.30 r\u1ec5\/ hom.<\/p>\n

– N\u1ed3ng \u0111\u1ed9 0.4% c\u0169ng cho k\u1ebft qu\u1ea3 t\u01b0\u01a1ng \u0111\u1ed1i kh\u1ea3 quan: T\u1ef7 l\u1ec7 ra r\u1ec5 l\u00e0 21.4% v\u00e0 v\u01b0\u1ee3t h\u01a1n \u0111\u1ed1i ch\u1ee9ng l\u00e0 60.9%, c\u00f3 s\u1ed1 r\u1ec5 trung b\u00ecnh 3.33 r\u1ec5\/ hom, chi\u1ec1u d\u00e0i trung b\u00ecnh m\u1ed7i r\u1ec5 c\u00e1i l\u00e0 5.68cm; tuy th\u1ea5p h\u01a1n \u0111\u1ed1i ch\u1ee9ng nh\u01b0ng k\u1ebft qu\u1ea3 t\u01b0\u01a1ng \u0111\u1ed1i t\u1ed1t so v\u1edbi c\u00e1c n\u1ed3ng \u0111\u1ed9 c\u00f2n l\u1ea1i.<\/p>\n

– N\u1ed3ng \u0111\u1ed9 cao 0.8%, 1.0%, t\u1ef7 l\u1ec7 ra r\u1ec5 th\u1ea5p d\u1ea7n v\u00e0 c\u00f3 khi t\u1ef7 l\u1ec7 ra r\u1ec5 b\u1eb1ng \u0111\u1ed1i ch\u1ee9ng, th\u1eadm ch\u00ed chi\u1ec1u d\u00e0i r\u1ec5 v\u00e0 s\u1ed1 r\u1ec5 c\u00e1i tr\u00ean m\u1ed7i hom l\u1ea1i nh\u1ecf h\u01a1n.<\/p>\n

Nh\u01b0 v\u1eady, n\u1ed3ng \u0111\u1ed9 th\u00edch h\u1ee3p nh\u1ea5t cho vi\u1ec7c gi\u00e2m hom t\u1ebfch l\u00e0 0.4% – 0.6% \u1edf d\u1ea1ng b\u1ed9t. N\u1ed3ng \u0111\u1ed9 cao h\u01a1n hay \u00edt h\u01a1n kho\u1ea3ng n\u1ed3ng \u0111\u1ed9 n\u00e0y th\u00ec t\u1ef7 l\u1ec7 ra r\u1ec5, s\u1ed1 l\u01b0\u1ee3ng r\u1ec5 m\u1ecdc ra t\u1eeb hom v\u00e0 chi\u1ec1u d\u00e0i c\u1ee7a ch\u00fang c\u00e0ng b\u00e9 d\u1ea7n \u0111i v\u1ec1 hai ph\u00eda.<\/p>\n

c. Lo\u1ea1i hom t\u1ebfch<\/em><\/p>\n

* K\u1ebft qu\u1ea3 th\u00ed nghi\u1ec7m t\u1eebng lo\u1ea1i hom t\u1ebfch ch\u1ec9 ra \u1edf bi\u1ec3u 4.<\/p>\n

Bi\u1ec3u 4. Kh\u1ea3 n\u0103ng ra r\u1ec5 t\u1ebfch th\u1ec3 hi\u1ec7n qua c\u00e1c \u0111o\u1ea1n hom kh\u00e1c nhau<\/em><\/p>\n\n\n\n\n\n\n
Ch\u1ec9 ti\u00eau nghi\u00ean c\u1ee9u<\/td>\n\u0110o\u1ea1n ng\u1ecdn<\/td>\n\u0110o\u1ea1n gi\u1eefa<\/td>\n\u0110o\u1ea1n s\u00e1t g\u1ed1c<\/td>\n<\/tr>\n
T\u1ef7 l\u1ec7 ra r\u1ec5 (%)<\/td>\n20.3<\/td>\n24.5<\/td>\n24.3<\/td>\n<\/tr>\n
S\u1ed1 l\u01b0\u1ee3ng r\u1ec5 (c\u00e1i)<\/td>\n2.67<\/td>\n3.75<\/td>\n4.25<\/td>\n<\/tr>\n
Chi\u1ec1u d\u00e0i (cm)<\/td>\n8.55<\/td>\n11.77<\/td>\n6.15<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

* Nh\u1eadn x\u00e9t:<\/p>\n

Ch\u01b0a c\u00f3 t\u1ef7 l\u1ec7 ra r\u1ec5 kh\u00e1c bi\u1ec7t l\u1edbn gi\u1eefa c\u00e1c \u0111o\u1ea1n hom kh\u00e1c nhau. Tuy nhi\u00ean, \u0111o\u1ea1n gi\u1eefa c\u00f3 t\u1ef7 l\u1ec7 ra r\u1ec5 cao nh\u1ea5t (24.5%), v\u1edbi chi\u1ec1u d\u00e0i r\u1ec5 c\u00e1i trung b\u00ecnh l\u00e0 11.17cm. V\u00ec v\u1eady, c\u00f3 th\u1ec3 l\u1ea5y to\u00e0n b\u1ed9 ch\u1ed3i 4 th\u00e1ng tu\u1ed5i \u0111\u1ec3 gi\u00e2m hom do c\u00e1c hom \u0111\u1ec1u cho k\u1ebft qu\u1ea3 t\u01b0\u01a1ng \u0111\u01b0\u01a1ng nhau.<\/p>\n

IV. K\u1ebft lu\u1eadn v\u00e0 khuy\u1ebfn ngh\u1ecb<\/p>\n

4.1 K\u1ebft lu\u1eadn<\/em><\/p>\n

a. Ch\u1ecdn c\u00e2y tr\u1ed9i: <\/em><\/p>\n

Tuy c\u00f2n nhi\u1ec1u h\u1ea1n ch\u1ebf v\u1ec1 di\u1ec7n t\u00edch, tu\u1ed5i c\u00e2y, ngu\u1ed3n gi\u1ed1ng nh\u01b0ng 31 c\u00e2y tr\u1ed9i \u0111\u00e3 \u0111\u01b0\u1ee3c ch\u1ecdn t\u1eeb c\u00e1c l\u1eadp \u0111\u1ecba kh\u00e1c nhau nh\u01b0 \u0110\u1ecbnh Qu\u00e1n, La Ng\u00e0, L\u1ed9c Quang, M\u00e3 \u0110\u00e0 v\u00e0 EaKm\u00e1t. C\u00e1c c\u00e2y tr\u1ed9i n\u00e0y lu\u00f4n c\u00f3 \u0111\u1ed9 v\u01b0\u1ee3t v\u1ec1 \u0111\u01b0\u1eddng k\u00ednh ngang ng\u1ef1c, chi\u1ec1u cao v\u00fat ng\u1ecdn so v\u1edbi tr\u1ecb s\u1ed1 b\u00ecnh qu\u00e2n l\u00e2m ph\u1ea7n l\u00e0 >=”1.5″ SD v\u00e0 c\u00f3 chi\u1ec1u cao d\u01b0\u1edbi c\u00e0nh l\u1edbn h\u01a1n 1\/2 chi\u1ec1u cao v\u00fat ng\u1ecdn c\u1ee7a ch\u00fang. Ngo\u00e0i ra, c\u00e2y tr\u1ed9i c\u00f2n c\u00f3 ph\u1ea9m ch\u1ea5t t\u1ed1t nh\u01b0 th\u00e2n tr\u00f2n, th\u1eb3ng, t\u00e1n c\u00e2y c\u00e2n \u0111\u1ed1i v\u00e0 m\u1ee9c \u0111\u1ed9 s\u00e2u b\u1ec7nh \u00edt ho\u1eb7c kh\u00f4ng c\u00f3.<\/p>\n

b. V\u01b0\u1eddn gi\u1ed1ng v\u00f4 t\u00ednh:<\/em><\/p>\n

Qua 2 v\u01b0\u1eddn gi\u1ed1ng t\u1ea1i B\u1ea7u B\u00e0ng – \u0110\u00f4ng Nam b\u1ed9 v\u00e0 Kon H\u00e0 N\u1eebng – T\u00e2y Nguy\u00ean ch\u01b0a th\u1ea5y c\u00f3 s\u1ef1 sai kh\u00e1c l\u1edbn gi\u1eefa c\u00e1c d\u00f2ng v\u1ec1 \u0111\u01b0\u1eddng k\u00ednh v\u00e0 chi\u1ec1u cao. Tuy nhi\u00ean, c\u00f3 m\u1ed9t s\u1ed1 d\u00f2ng s\u1edbm bi\u1ec3u hi\u1ec7n t\u00ednh tr\u1ed9i nh\u01b0 l\u1edbn v\u1ec1 \u0111\u01b0\u1eddng k\u00ednh, tr\u1ed9i v\u1ec1 chi\u1ec1u cao (d\u00f2ng 22 DQ, 01 MD v\u00e0 43L).<\/p>\n

Ph\u00e2n t\u00edch s\u1ed1 li\u1ec7u cho th\u1ea5y ch\u01b0a ph\u00e1t hi\u1ec7n \u0111\u01b0\u1ee3c m\u1ed1i quan h\u1ec7 t\u01b0\u01a1ng quan gi\u1eefa sinh tr\u01b0\u1edfng c\u1ee7a h\u1eadu th\u1ebf v\u00f4 t\u00ednh v\u1edbi gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i c\u1ee7a c\u1ee1 k\u00ednh ho\u1eb7c \u0111\u1ed9 v\u01b0\u1ee3t tr\u1ed9i c\u1ee7a ch\u00fang so v\u1edbi b\u00ecnh qu\u00e2n l\u00e2m ph\u1ea7n trong giai \u0111o\u1ea1n \u0111\u1ea7u c\u00e2y c\u00f2n non tu\u1ed5i.<\/p>\n

V\u1ec1 v\u01b0\u1eddn gi\u1ed1ng t\u1ea1i B\u1ea7u B\u00e0ng, c\u00e2y t\u1ebfch c\u00f3 bi\u1ec3u hi\u1ec7n ch\u1ebft d\u1ea7n do l\u00fac \u0111\u1ea7u ch\u1ecdn l\u1eadp \u0111\u1ecba kh\u00f4ng th\u00edch h\u1ee3p \u0111\u1ed1i v\u1edbi \u0111\u1eb7c \u0111i\u1ec3m sinh h\u1ecdc c\u1ee7a c\u00e2y. V\u00ec v\u1eady, ch\u00fang ta c\u1ea7n c\u00f3 bi\u1ec7n ph\u00e1p k\u1ecbp th\u1eddi \u0111\u1ec3 duy tr\u00ec ngu\u1ed3n gen qu\u00fd n\u00e0y.<\/p>\n

c. V\u01b0\u1eddn gi\u1ed1ng tr\u1ed3ng b\u1eb1ng h\u1ea1t:<\/em><\/p>\n

C\u00e2y c\u00f2n nh\u1ecf, m\u1edbi h\u01a1n 2 n\u0103m tu\u1ed5i n\u00ean ch\u01b0a c\u00f3 sai kh\u00e1c \u0111\u00e1ng k\u1ec3 gi\u1eefa c\u00e1c d\u00f2ng. Tuy nhi\u00ean, do ch\u1ecdn \u0111\u1ecba \u0111i\u1ec3m kh\u00f4ng th\u00edch h\u1ee3p n\u00ean c\u00e2y t\u1ebfch \u1edf \u0111\u00e2y b\u1eaft \u0111\u1ea7u sinh tr\u01b0\u1edfng ch\u1eadm l\u1ea1i v\u00e0 c\u00f3 d\u1ea5u hi\u1ec7u ch\u1ebft r\u1ea3i r\u00e1c trong m\u00f9a kh\u00f4.<\/p>\n

d. Gi\u00e2m hom t\u1ebfch:<\/em><\/p>\n

Vi\u1ec7c gi\u00e2m hom t\u1ebfch \u0111em l\u1ea1i th\u00e0nh c\u00f4ng t\u01b0\u01a1ng \u0111\u1ed1i th\u1ea5p (24.5%). N\u1ebfu s\u1eed d\u1ee5ng ph\u01b0\u01a1ng ph\u00e1p gi\u00e2m hom th\u00ec n\u00ean x\u1eed l\u00fd hom (4 th\u00e1ng tu\u1ed5i) \u1edf n\u1ed3ng \u0111\u1ed9 0.4% – 0.6% (d\u1ea1ng b\u1ed9t).<\/p>\n

4.2 Ki\u1ebfn ngh\u1ecb<\/em><\/p>\n

a. \u0110\u1ec3 duy tr\u00ec ngu\u1ed3n gen v\u00e0 c\u00f3 \u0111\u00e1nh gi\u00e1 khoa h\u1ecdc v\u1ec1 c\u00e1c c\u00e2y tr\u1ed9i \u0111\u00e3 qua ch\u1ecdn l\u1ecdc, c\u1ea7n di chuy\u1ec3n ngu\u1ed3n gen hi\u1ec7n c\u00f2n t\u1ea1i khu th\u00ed nghi\u1ec7m B\u1ea7u B\u00e0ng v\u1ec1 n\u01a1i tr\u1ed3ng m\u1edbi c\u00f3 \u0111i\u1ec1u ki\u1ec7n sinh th\u00e1i th\u00edch h\u1ee3p v\u1edbi c\u00e2y t\u1ebfch b\u1eb1ng nh\u00e2n gi\u1ed1ng v\u00f4 t\u00ednh (gh\u00e9p).<\/p>\n

b. C\u1ea7n s\u1edbm kh\u1ea3o nghi\u1ec7m c\u00e1c xu\u1ea5t x\u1ee9 tr\u00ean c\u00e1c l\u1eadp \u0111\u1ecba v\u1edbi b\u1ed9 gi\u1ed1ng \u0111\u1ea7y \u0111\u1ee7 d\u1ef1a tr\u00ean s\u1ef1 h\u1ee3p t\u00e1c qu\u1ed1c t\u1ebf, \u0111\u1eb7c bi\u1ec7t l\u00e0 c\u00e1c gi\u1ed1ng t\u1ebfch c\u00f3 gi\u00e1 tr\u1ecb \u1edf Myanma, Th\u00e1i lan, In\u0111\u00f4n\u00eaxia.<\/p>\n

c. Lo\u00e0i t\u1ebfch c\u00f3 \u01b0u \u0111i\u1ec3m l\u00e0 sinh tr\u01b0\u1edfng nhanh, n\u0103ng su\u1ea5t v\u00e0 gi\u00e1 tr\u1ecb kinh t\u1ebf cao nh\u01b0ng tu\u1ed5i kinh doanh t\u01b0\u01a1ng \u0111\u1ed1i d\u00e0i (50n\u0103m) n\u00ean c\u1ea7n ti\u1ebfp t\u1ee5c theo d\u00f5i, thu th\u1eadp s\u1ed1 li\u1ec7u, ph\u00e2n t\u00edch v\u00e0 nh\u1eadn x\u00e9t c\u00e1c k\u1ebft qu\u1ea3 th\u00ed nghi\u1ec7m m\u1ed9t c\u00e1ch khoa h\u1ecdc.<\/p>\n

Tectona grandis<\/em>tree selection for Eastern South Viet Nam and the Central Highland.<\/p>\n

Summary:<\/em> These mentioned in the paper results of research on plus tree selection, establishment of seed orchard from grafts in Bau Bang (Eastern South Vietnam) and Kon Ha Nung (Central Hiaghland), and experiments an rooting of teak cuttings. The results obtained are:<\/p>\n

+ 31 plus trees selected from different sites.<\/p>\n

+ In experimental seed orchard from grafts established in Kong Ha Nung the trees have their diameter and height far greater than those of the trees in seed orchard from grafts in Bau Bang.<\/p>\n

+ Teak seed orchard raised by seedlings and rooting of teak cuttings give poor results.<\/p>\n

Some recommendations are finally made by the author:<\/p>\n

+ The gene source existing now in experimental area in Bau Bang must be transferred to the new planting area where the ecological conditions are suitable to Teak by vegetative propagation.<\/p>\n

+ Early trial at different sites various Teak provenances especially those received from international cooperation.<\/p>\n

***********************************<\/p>\n","protected":false},"excerpt":{"rendered":"

Di\u1ec7n tích r\u1eebng t\u1ef1 nhiên \u1edf n\u01b0\u1edbc ta ngày càng b\u1ecb thu h\u1eb9p do nhi\u1ec1u nguyên nhân khác nhau, vì v\u1eady công tác tr\u1ed3ng l\u1ea1i r\u1eebng có m\u1ed9t t\u1ea7m quan tr\u1ecdng \u0111\u1eb7c bi\u1ec7t và r\u1ea5t c\u1ea5p bách. Ngoài nh\u1eefng cây b\u1ea3n \u0111\u1ecba truy\u1ec1n th\u1ed1ng \u0111\u01b0\u1ee3c nhân dân ta tr\u1ed3ng nh\u01b0 tre, thông, sao d\u1ea7u … n\u01b0\u1edbc ta còn nh\u1eadp m\u1ed9t s\u1ed1 loài cây có ngu\u1ed3n g\u1ed1c t\u1eeb n\u01b0\u1edbc ngoài, trong \u0111ó có cây T\u1ebfch (Tectona grandis). <\/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\/8560"}],"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=8560"}],"version-history":[{"count":2,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts\/8560\/revisions"}],"predecessor-version":[{"id":19339,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts\/8560\/revisions\/19339"}],"wp:attachment":[{"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/media?parent=8560"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/categories?post=8560"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/tags?post=8560"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}