Nitrogen movement and transformation with different water supply for paddy rice
Nitrogen movement and transformation with different water supply for paddy rice
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发表时间：
2004
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通讯作者：
Cui Yuan-lai
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作者：
Cui Yuan-lai
利用不同水氮处理的试验资料，研究了不同水氮处理下水稻氮素迁移转化规律、氨挥发损失和氮素淋失、氮素在水稻体内的分配、稻田氮素平衡等方面的变化，结果表明：与连续淹水相比，节水灌溉条件下土壤溶液浓度较高，氨挥发损失较大;尽管WSI处理渗滤水中NH 4+和NO3-浓度较高，但由于总渗滤损失量远低于CF处理，因此总氮淋失量较低。在节水灌溉条件下，增加氮素供应的分配次数可以减少氮素损失，提高氮素利用率。节水灌溉有利于氮素的利用和向籽粒的转移。WSI模式在尿素250-400 kg/hm~2分3次施用时，水稻的水肥管理效果最佳。
With experiment data under different water and nitrogen treatments, this paper studies the changing patterns of nitrogen movement and transformation, losses of ammonia volatilization and nitrogen leaching, nitrogen distribution within rice plant, nitrogen balance in paddy fields.The results shows that ammonia volatilization is high under water saving irrigation (WSI) compared with continuous flooding (CF) because the soil solution concentration is higher. Although concentration of NH~+_4 and NO~-_3in the percolation water is higher under WSI, total nitrogen leaching loss is lower because the total percolation loss is much lower than those of CF. Under WSI conditions, more nitrogen supply splits can decrease nitrogen losses and increase nitrogen efficiency. WSI practice is propitious to nitrogen recovery and its transferred to grain. The WSI regime produces optimal water and fertilizer management for paddy rice when 250-400 kg/hm~2 of urea is applied through three splits.