不同施肥水平对粤北坡岗地木薯干物质积累和产量的影响

Efect of diferent NPK level on cassava dry matter accumulation and yields in sloping soil of Northern Guangdong

在粤北翁源坡岗地采用"3414"试验方案,开展不同施肥水平对木薯干物质积累和产量影响的研究。结果表明,不同施肥处理对木薯干物质积累影响显著,在不施肥情况下,木薯生长缓慢,干物质积累速度小,生育期提前。在氮磷钾三要素中,氮是木薯产量第一限制因子,磷是第二限制因子,钾是第三限制因子。随着氮、磷、钾单一养分用量增加,木薯产量随之增加,但氮肥过量和钾肥过量均不利于增产。在14个施肥水平处理中,施肥效果最佳的是N2P3K2处理,其次是N2P2K2处理。

By using the method of ＂3414＂field trials in sloping soil of Wengyuan,Northern Guangdong,the effects of different NPK level on cassava dry matter accumulation and yields were studied.The results obtained were as follows： Different NPK level had notable effect on cassava dry matter accumulation.For the no NPK treatment cassava plant,its growth became slow,rate of dry matter accumulation became low,and growth period became advanced.For cassava yields,N was the first restricting factor,P2O5 was the second,and K2O was the third.With content of N,P2O5 and K2O increased,cassava yields enhanced.However,excessive N and K2O level could not increased cassava yields.Among all 14 treatments,N2P3K2 fertilizing level had the best effect on cassava yields,then was the N2P2K2.