【摘要】 本文通过对不同施氮量与移栽玉米产量的两种模型比较 ,得出线性加平台能较好的模拟产量与施氮量的关系 ,由此得到了最佳施氮量和最佳产量 ,同时确定了玉米植株硝酸盐 ,土壤0～ 30 cm硝酸盐的推荐施氮临界值指标。更多还原

【Abstract】 By comparing two models simulated relation between nitrogen fertilizer rate and corn yield under transplanted pattern, the results show that the linear plus plateau model can simulate the relation well. The optimal nitrogen fertilizer rate for transplanted corn and the optimal corn yield then can be obtained from the model. Thereafter, the critical values of corn leaf nitrate concentration and nitrate concentration in 0~30cm-soil layer are determined for nitrogen fertilizer dressing.更多还原