Regulating Yield and Lodging-resistance of Ratoon Rice,Jiafuzhan

In preparation of using the high-yield ratoon rice,Jiafuzhan,for mechanized cultivation,the stalk-lodging control with nitrogen(N)fertilization and the application of a lodging agent were testedon the initial crop of the rice.The results showed that N fertilization increased the tiller count,leaf area and dry matter accumulation.At13.8kg N per 667m2,the highest yield was obtained.It followed by the N fertilization of 9.2kg.However,the yields were not significantly different.The bending moment of the rice stalks increased with increasing N application.The resistance of lodging(EPT)related to N addition in a parabolic function.The 13.8kg N per667m2 treatment significantly increased the bending moment of stalks,but less apparent on EPT with lodging observedat maturity of the plant.The Gasch lodging agent,Lifengling,significantly reduced the bending moment and increased the effect on EPT of the rice stalks.It appeared that,through adequate applications of both N fertilizer and lodging agent,Jiafuzhan could be adequately applied inmechanized cultivation.