In order to study the ecological effect of balanced fertilization on paddy soil with P-deficiency treated, a pot-experiment by cropping rice had been conducted for 3.5 years. The soil for experiment was got from the plowed layer soil in plot treated with chemical N and K but P-fertilizer in a long-term experiment of soil fertility and benefit of fertilizer in red earth paddy soil. Six different treatments including chemical N and K (NK), N, P, and K chemical fertilizer (NPK), N, P, and K chemical fertilizer mixed with Si fertilizer (NPKSi), three-fifths of N, P and K chemical fertilizer and tw...
