关键词: 固氮潜力, 固氮潜力

Abstract:

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. 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.