提高稻田氮素生态效益的施肥技术

A fertilizer practice improving the ecological impact of nitrogen in paddy field

田间试验结果表明,在有水层下把氮肥撒施在土表的“习惯施肥法”易引起氨挥发和硝化-反硝化的N素损失,基肥“全层混施”或“犁沟深施”、追肥“以水带N”的“改进施肥法”可以避免“习惯施肥法”的上述缺点,提高N肥利用率20—30％,提高N肥增产效率25％左右。该施肥法可减少大气和水体环境的污染,且有益于人类社会和增加土壤N素肥力,是一项提高N素生态效益的施肥技术。

An improved fertilizer practice (IFP) suggested, which increases the N use efficiency by 20—30% and rice yield by 400-1 004kg/ha, as compared with the conventional one(CFP). Based on the results of field experiment, the ecological impact of the improved fertilizer practice was discussed in respects of reducing atmospheric and water pollution, increasing soil N fertility and benefiting people and society.