Itthiphon kan tatyot to phonphalit thua lisong.
1993
Ruthapon Chooyord
Effect of defoliation on 2 groundnut varieties SK.38 and Tainan 9 was studied at Nakhon Sawan Field Crops Research Center during rainy season 1989 to dry season 1990. Groundnut main shoots were cut at 70, 75, 80 days after emergence and at the height of 30, 40 centimeters high above ground level. These topping treatments were compared to two control treatments of growth retardant (SADH) sprayed and non topping. The results showed that there was no significant differences among defoliation treatments and the two controls on seed yield in both rainy and dry seasons. In rainy season, the defoliation of SK.38 at 80 days and 30 cm height tended to give highest yield of 198 kg/rai. For Tainan 9 the defoliation at 75 days and 40 cm height gave highest yield of 260 kg/rai. In dry season, the defoliation of SK.38 at 75 days and 40 cm height gave the highest yield of 364 kg/rai. For variety Tainan 9, the plant height rarely reached the level of minimum height of topping. Then the defoliation treatment was applied for those plants taller than the determined height. In both seasons, shoot fresh weight removed from SK.38 were higher than from Tainan 9. Fresh weight obtained from rainy season were higher than dry season.
显示更多 [+] 显示较少 [-]