施用氮、磷肥对作物体内养分含量的影响

２年四季盆栽试验结果表明：（１）施用磷肥能改善作物地上部生物学产量向籽粒分配．在Ｎ、Ｐ胁迫条件下，施Ｎ增加非经济产量与经济产量比值．（２）对于谷子，在Ｎ、Ｐ亏缺条件下，施Ｎ能增加茎叶含Ｎ量，降低Ｎ向籽粒中转移；施磷能改善Ｎ在茎叶与籽粒之间的分配。（３）对于小麦，在Ｎ或Ｐ胁迫条件下，补施Ｐ或Ｎ均能增加冠根吸Ｎ量之比，对于谷子，其对冠根吸Ｎ量之比影响与小麦完全不同．（４）谷子在Ｎ、Ｐ胁迫条件下，施Ｎ能降低Ｐ在籽粒中积累，施Ｐ却能显著地改善磷向籽粒中转移，小麦在Ｎ、Ｐ胁迫条件下，增施Ｐ或Ｎ均能显著改善磷向籽粒中转移。

THE NUTRIENT DISTRIBUTION IN PLANT AS EFFECTED BY APPLICATION OF N,P FERTILIZER

The pot experiments arranging 4 crops for 2 years show as follows:(1)Application of P fertilizer may improve the distribution which biomass transfers grain.Under the N,P stress,the application of N may add the ratio of no-ecological and ecological yields.(2)Under the N,P stress,applying N may enhance the N content of millet stem-leaf and reduce the N distribution for grain,however applying P may improve N distribution of stem-leaf and grain.(3)In the N or P stress,P or N-applied may the N ratio of wheat biomass and roots yeilds, but millet differs from wheat completely. (4)In N,P stress,applying N can decrease the P accumulation in millet grain.However,applying P may increase the P accumulation in millet grain. Under the condition of N or P stress,N-applied can improve the P transfered grain remarkably.