Two year′s field experiment was conducted to study N supply pro-cess in soil under the application of green manure,swine manure and rice straw respectively. At the preceding stage after green manure was ploughed under, the amount of mineralizable N tallied with quadratic equation y=-1.70+0.629x-0.0164x~2 and the curve peak value occurred at the twentith day after plough-ing. while in the later stage organic N from green manure was mineralized under the influence of rice roots, most of it was absorbed by rice. The pattern of N uptake by rice co...
