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通过大田实验研究不同氮磷钾肥用量、氮磷钾配施、有机无机肥配施对设施土壤硝态氮残留的影响.结果表明:设施土壤中硝态氮质量比随着氮肥用量的增加迅速增加,并且随着种植年限增加不断累加;而适量的磷肥和钾肥有利于降低硝态氮的质量比.与不施肥处理相比,单施有机肥时土壤中残留的硝态氮较少,而单施化肥土壤中的硝态氮残留量明显增加,掺沙后促进了土壤有机氮和有机肥的矿化,使硝态氮累积量进一步增加.化肥与有机肥配施时,土壤的硝态氮质量比因作物而异,可能由于作物的生育期和需肥量不同导致的.
The effects of N, P and K fertilizers and organic-inorganic fertilizers on the residual nitrate nitrogen in facility soil were studied through field experiment.The results showed that the nitrate nitrogen mass ratio in the facilities soil increased rapidly with the increase of nitrogen fertilizer , And increased with the planting years continuously increasing.The appropriate amount of phosphate fertilizer and potassium fertilizer was beneficial to reduce the mass ratio of nitrate nitrogen.Compared with non-fertilization treatment, The amount of nitrate nitrogen in fertilizers increased obviously, and the mineralization of soil organic and organic fertilizers promoted the mineralization of soil organic nitrogen and further increased the accumulation of nitrate nitrogen.When fertilizers and organic fertilizers were applied, the nitrate nitrogen The mass ratio varies from crop to crop, possibly due to the different crop growth periods and the amount of fertilizer needed.