红壤稻田养地体系的研究──Ⅱ．有机、无机肥结合对红壤性水稻上生产性及肥力的影响

３组基础肥力不同的红壤性水稻土３ａ６季盆栽水稻培育结果表明：稻谷增产倍率显著受土壤基础肥力与施肥处理双重影响．施肥使水稻蘖穗得到较充分发育，而较高基础肥力结合施用有机、无机肥更能巩固水稻前、中期的生长效果，有效穗率与经济系数超过低肥上或全化肥的．短期效益以全化肥优于有机、无机肥结合，更优于全有机肥．而有机、无机肥结合具有较高集约性和长、短效益兼顾性，更显著地富化土壤养分容量，提高元素生产效率．

Studies on the Productivity Improving System for Paddy Soils Derived From Red Earth ──Ⅱ. The Effect of the Combination of Organic Manures and Inorganic Fertilizers on the Fertility and the Productivity of Paddy Soils

The pot experiment during .three years (six seasons) with rice and three soils of different original fertility showed that the effect was stronger for the paddy soil from red earth than for the others. The yield-raising effect was significantly influenced by the original level of soil fertility and the treatment. The application of manures and fertilizers made the tillers and the ears to develop better. When the manures and the fertilizers were applied to the soils with higher level of fertility, the rice grew well in the early and the middle development stage, the growth effectivity and the economic coefficient were better than those for the treatment with soils of lower fertility level and the treatment with pure inorganic fertilzers. The short-term benefit of the treatment with pure inorganic fertilizers was better than that with half inorganic fertilizer which was better than that with pure organic manures. The analysis of productivity conformed that the combination of organic manures and inorganic fertilizers had a comprehensive advatgage because this treatment increased the capacity of available nutrients of the soils and the productivity of nitrogen and phosphorous in the plant,and showed both the long-term and shore-term benefit.