旱地冬小麦吸收氮、磷的营养特征

The characteristic of nitrogen and phosphorus absorption by winter wheat in dryland

通过田间试验 ,研究了不同施肥水平条件下冬小麦吸收氮、磷的营养特征。结果表明 ,不同施肥水平冬小麦返青前吸收氮、磷均很少 ,返青后迅速增多 ,至孕穗—灌浆初期达全生育期吸收的高峰 ( N0 P0 吸氮在拔节—孕穗阶段达高峰 ) ,且峰值随施肥水平提高而增大。灌浆以后 ,氮磷营养不同 :氮素积累减少 2 8.2 7%～ 31 .1 9% ,减少绝对量随前期吸氮增大而增加。相对量则是施肥略低于对照 ;而磷素于灌浆中期—成熟阶段还有 1吸收高峰 ( N0 P0 例外 ) ,且灌浆初期至成熟阶段积累的磷素所占比值较大 ,呈现出中后期偏多的特点。

By field experiment, the characteristic of nitrogen and phosphorus absorption by winter wheat under different fertilization was studied.The results were as follows:for all treatment,the amount of N and P absorption was small before turning green.The absorption rose quickly after regreening and got their peaks in the period of booting to early filling while N 0P 0 got the peak of N absorption in the period of shooting to booting, and the peak increased with fertilizer rates rising.After early filling,the N accumulation during the earlier stage decreased by the percentage of 28.27~31.19 and the amount of N loss rose with N absorptions increase during the early stages.However,P had the characteristic of much absorption in the middle and late stages. P absorption had another peak for treatments except CK in the period of mid filling to maturation and the amount of accumulated P during the period from early filling to maturation occupied a large proportion of total P.