不同施肥措施对旱地玉米土壤硝态氮累积的影响

长期定位试验研究不同施肥措施对旱地玉米土壤(NO3--N)累积的影响结果表明,不同施肥和秸秆还田措施可不同程度造成0~500cm土层NO3--N的累积,且对0~300cm土层NO3--N的累积影响较大。秋施肥秸秆覆盖还田处理产量最高,且土壤NO3--N累积量较低,所造成的环境风险也小,为我国北方半湿润偏旱区适宜施肥措施。

Effects of different fertilizer application countermeasures on the soil nitrate nitrogen accumulation in dryland maize.

The effects of different fertilizer application countermeasures on the soil NO3^--N accumulation in dryland maize were studied by the long-term located experiments. The results show that the different fertilizer application countermeasures can cause the soil NO3^--N accumulation in 0 - 500cm soft body in some degrees and have more effect on 0-300cm soil layer. The treatment of autumn fertilization with stubble mulch return is a perfect pattern for obtaining higher yield of corn in the semi-damp and drought areas of North China, can lower the soil NO3^--N accumulation and cause smaller danger to the environment.