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田间试验在湖南的衡山县和长沙县进行,探讨了不同肥力水平水稻土上水稻控释氮肥对早、晚稻的增产效果和肥料氮利用率。结果表明,在肥力水平较低的水稻土上施用水稻控释氮肥对水稻的增产效果极为显著,应当增加施用量;在肥力水平较高的水稻土上,水稻吸收土壤氮较多,肥料氮的吸收量与增产作用自然减少,应适当减少施用量。不同肥力水平的土壤上水稻控释氮肥较等氮量尿素增产4.4%～16.4%。较无氮区增产13.8%～74.5%。水稻控释氮肥在不同肥力水平土壤中早、晚稻的利用率为69.7%～86.9%,平均比等N量尿素高37.6%,且水稻控释氮素利用率的高低与土壤肥力水平有关。水稻控释氮肥作一次性全量基肥施用,氮素生产效率明显高于尿素,是增产的主要原因。
Field experiments were carried out in Hengshan County and Changsha County in Hunan Province. The effects of controlled release nitrogen fertilizers on the yield of early and late rice and the fertilizer nitrogen utilization were discussed. The results showed that the application of rice controlled release N fertilizer on paddy soil with low level of fertility was extremely significant, and the application rate should be increased. On the paddy soil with higher level of fertility, paddy soil had more nitrogen and nitrogen Absorption and increase the role of natural reduction, should be appropriate to reduce the application rate. Controlled release N fertilizers increased 4.4% ~ 16.4% of the urea nitrogen in the soils with different fertility levels. Nitrogen-free area yield 13.8% ~ 74.5%. The rate of early and late rice utilization in paddy soil with different fertility levels was 69.7% ~ 86.9% and the average N rate was 37.6%. The rate of N use efficiency of rice was related to soil fertility. Rice controlled-release nitrogen fertilizer as a one-time full base fertilizer application, nitrogen production efficiency was significantly higher than urea, is the main reason for yield.