Contribution of Fertilization Development in Rice-yield Increase and Effects on Soil Fertility in Red Paddy Area

Aong-term field trial on eight simulated models representing the fundamental types of fertilization system in China had been carried out in Taoyuan Agro-ecosystem experimental Station of the Chinese Academy of Sciences from 1990 to 1999. The results indicated that the contribution of fertilization to crop yield was significantly influenced by the fertilization system adopted in rice cropping systems of red soil area of China. In the case of optimum fertilization system, the largest contribution of fertilizer applied was 38.5% while that of incorporation organic and inorganic fertilizer was 44.7%. The fertilization systems of N and NP could conduce to the imbalance of the soil fertility development while the fertilization system of NPK could maintain the soil fertility. But it could promote effectively that soil organic matter cumulated and soil fertility increased incorporation the organic manure and fertilizer.