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在徐州黄潮土类沙土上有机无机氮定位试验也表明,5:5处理产量最稳定,变异系数最小。随有机肥料氮比例增加,作物吸氮量减少,磷钾吸量提高,NPK吸收比例协调,植株抗逆性增加。养分收支(N_(30))3:7氮素有余,磷钾不足,5:5及7:3氮磷钾皆有盈余,0:10氮素盈余多,磷钾亏损大。随年限延续,有机氮吸收率提高,无机氮吸收率下降。土壤中全氮略高于土壤无肥区10年平均值0.074％,较原始土壤0.078％下降5.1％,
The organic-inorganic nitrogen localization test on yellow soil in Xuzhou also showed that the yield of 5: 5 was the most stable and the coefficient of variation was the smallest. With the increase of organic manure nitrogen, crop nitrogen uptake decreased, phosphorus and potassium uptake increased, the proportion of NPK absorption coordinated, plant stress increased. Nutrient income and expenditure (N_ (30)) 3: 7 More nitrogen than phosphorus and potassium, 5: 5 and 7: 3 N, P and K have a surplus, 0: 10 Nitrogen surplus, phosphorus loss large. With years of continuity, organic nitrogen absorption rate increased, inorganic nitrogen absorption decreased. Total nitrogen in soil was slightly higher than the 10-year average of 0.074% in the soil-free zone, down 5.1% from 0.078% in the original soil,