Abstract: The relationship of fertilization methods with the soil fertility and output of the purplish paddy soil has been studied for 12 successive years in central Yunnan. It is a stationary plot experiment in the filed with the rotation system of rice and wheat. The experiment has 7 treatments, that is, O (farmyard manure), ONP (farmyard manure plus N and P),NP, NK, PK, NPK and the Control. The results of the experiment show that Treatment O and Treatment ONP are much higher than the Control and the other four treatments in soil fertility, with soil organic matter increased by 8.4g/kg or more, readily available N, P and K by 14.6% or more and soil bulk capacity decreased by 0.16 or more against the Control. The other four treatments, however, do not show any big difference from the Control in soil fertility.

Key words: soil fertility, long term stationary experiment, purplish paddy soil, Chuxiong