氮肥运筹对红壤稻田移栽油菜氮磷钾养分累积特性的影响

通过氮肥的用量、施用时期、种类的田间小区试验，研究氮肥运筹对油菜生长发育过程中氮磷钾养分吸收、积累的影响。结果表明，施氮水平高的处理与施氮水平低的处理相比，植株及各器官氮含量普遍偏高，而磷钾含量普遍偏低。氮磷钾无论是累积速率还是累积量均是成熟期最大。处理间E（控释氮肥）处理氮磷累积量最多，A（不施氮肥）处理最少；钾累积量G（60%控释氮肥+40%尿素）处理相对最多，A（不施氮肥）处理相对最少。在本试验条件下，施氮均为最高水平180 kg/hm2的控释氮肥E、控释氮肥与常规氮肥配施G处理植株氮磷钾累积量相对最多。

Effects of Different Nitrogen Application on the Content and Absorption of Nitrogen, Phosphorus, Potassium of Transplanted Rape Seed in Red Paddy

By the nitrogen fertilizer amount,application time and type of field experiment to study the effects of nitrogen application on NPK nutrient uptake and accumulation during rape seed growth and development.The results showed that high levels of nitrogen treatment improved N content in plant and various organs compared with low levels of nitrogen treatment.But high levels of nitrogen treatment reduced phosphorus and potassium content in plant and various organs.NPK accumulation rate and amount was maximum in maturity.E treatment（controlled-release nitrogen fertilizer） had the most N and P accumulation amount,while A treatment（no nitrogen） has the least N and P accumulation amount.K accumulation amount was relative larger with G treatment（60% controlled-release nitrogen fertilizer＋40% urea）,while was relatively less with A treatment.In the experimental conditions,180 kg/hm2 of controlled-release nitrogen fertilizer treatment E and combined application of controlled-release nitrogen fertilizer treatment G have the most NPK accumulation amount in rapeseed plant.