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用两种红壤性水稻土种稻,施用~(15)N标记豇豆绿肥、红萍和稻草分别与硫铵配合成的肥料。结果表明,配合施肥使低肥土水稻吸收的总氮量下降,肥料氮吸收率平均减低10％;而熟化土相应指标有增有减,稻谷增产。低肥土对肥料氮利用,以无机肥氮占总吸收量及谷实回收氮的优势(60％与68％);而熟化土两态氮吸收与谷实回收都接近平衡(5.3/4.7与4.8/5.2)。低肥土的肥料氮增产率高于熟化土。总体表明了低肥土以无机氮营养为主导,而熟化土则表现出发挥地力与无机有机肥氮综合效果的特征。
Two red soils of paddy soil were used for paddy cultivation, and ~ (15) N-labeled cowpea green manure, red duckweed and straw were respectively compounded with ammonium sulfate. The results showed that with the application of fertilizers, the total nitrogen absorbed by low-fat paddy decreased, while the average nitrogen absorption rate of fertilizers decreased by 10% on average. However, the corresponding indexes of matured soils increased and decreased, and the yield of paddy increased. Fertilizer use of low-fat soil nitrogen, with total inorganic nitrogen fertilizer and nitrogen recovery of grain yield advantage (60% and 68%); while the two-state soil nitrogen absorption and grain recovery are close to equilibrium (5.3 / 4.7 and 4.8 / 5.2). Nitrogen fertilizer yield of low-fat soil is higher than that of mature soil. Overall, it shows that the low-fat soil is dominated by inorganic nitrogen nutrition, whereas the mature soil shows the characteristics of integrated effect of fertility and organic-inorganic fertilizer.