有机无机复混肥对水稻氮素利用率的影响

INFLUENCE OF ORGANIC-INORGANIC COMPOUND FERTILIZERS ON NITROGEN RECOVERY IN PADDY RICE

在重庆地区 2种代表性中性紫色土上 ,研究有机无机复混肥对水稻产量、氮素利用率及土壤养分的影响。结果表明 ,施用有机———无机复混肥料提高了水稻株高、剑叶面积及穗长 ,降低了空壳率 ,以 40 %发酵有机———无机复混肥处理的当季水稻产量增加 2 .5 %～ 10 .1% ,为各处理最高 ,氮素利用率提高 17.6 5 % ,随有机N的比例增加水稻产量下降。连续两年施用有机无机复混肥 ,土壤速效P和有效K均有明显提高 ,且随着有机肥比例的增加其增幅亦增加 ,土壤碱解N的变化不明显。土壤阳离子交换量 (CEC)的变化与磷。

Organic-inorganic compound fertilizers were applied to 2 neutral purple soils in Chongqing to study their effects on the yield and nitrogen recovery of the rice crop and on nutrient content in the soil. The results showed that plant height, flag leaf area and spike length were enhanced and the percentage of unfilled grains decreased by the application of organic-inorganic compound fertilizers. The 40% fermented organic-inorganic fertilizer treatment appeared optimum, in which paddy grain yield increased by 2.5%～10.1% and nitrogen recovery by 17.65%. Paddy grain yield decreased with increase in organic N in the compound fertilizer. Application of organic-inorganic fertilizer in two successive years resulted in marked increase in available P and K in the soil, the increase range being greater as the proportion of organic N in the compound fertilizer increased. No conspicuous change in available N in the soil was observed in the study. The variation in CEC was similar to that in available P and K.