【摘要】 试验表明,在该实验条件下,N素施用量在14kg/667m2,水稻产量效益达最佳,再增加施氮量则出现下降;施肥后1-2周内土壤、田水NH4+均出现最高值,田水的含氮量较大,除保水保肥能力差的水田外,水田N素流失和污染水体的主要途径是田水外溢、排水。更多还原

【Abstract】 The experimental result showed that the rice yield increased most under the condition of application of 14kg of Nitrogenous fertilizer/1667m2,but began to decrease when adding Nitrogenous fertilizer.At the same time,NH4+ contained in soil and paddy water reached the highest level after applying Nitrogenous fertilize for 1-2 weeks and there was too much Nitrogen contained in the paddy water.Except the poor capacity of conserving water and fertilizer,the main channel that resulted in the loss of Nitrogenous fertilizer in the paddy water and the pollution of the paddy wate is due to outflow and drainage of the paddy water.更多还原