Effects Of N And P Fertilizer Applying Amount On The Yield In Hybrid Rice

Hybrid rice is one of the main crops in China . Improving the approach of fertilizer applying and increasing the yield for hybrid rice are the key technology measures in field practices , so it's an important and urgent task on which must be focused!Recently, the level of hybrid rice production has been improving, the technology of formula fertilizer application was commonly accepted and adapted by many peasants in field practices, however, the differences in soil fertility, peasants'cognition abilities and their habits for the formula fertilizer application in hybrid rice production, have led to aimless application on this technology, which couldn't get the expected increasing with fertilizer application. So this affected the potentialities of high yield in hybrid rice and also wasted fertilizer resulting in increasing the costs.Therefore, applying amount of Nitrogenous and phoshoric fertilizer, yield and diseases from 96 farmers at'shengkang'town were surveyed in this study. The results showed that: (l)it's effective to apply formula fertilizer in increasing hybrid rice yield, the Nitrogen and P2O5 should be about 10kg/mu and more than 5kg/mu respectively, (2)stabilizing N and increasing P fertilizer application was the main direction in increasing the yield of hybrid rice , (3)over applying of N fertilizer would lead to the appearance of rice sheath blight disease, however the harm of this disease would be reduced when increasing P fertilizer under the same N level, and also it could increase the yield of hybrid rice, (4)stabilizing N and increasing P could realize the aim of more harvest and more income, the rate of increasing yield is 1 to 1.37, the income is 1:1.43 when increasing one unit of pure N and P2O5.