Study on Effects of Nitrogen Phosphorus and Potassium Fertilizers and Recommended Dosage for Late Rice in Wuhan Suburb

[Objective] The aim was to discuss the effects of nitrogen phosphorus and potassium fertilizers on yield and economic benefit of late rice.[Method] Jinyou 402 was taken as tested late rice for fertilizer effect experiment in order to analyze the effects of nitrogen phosphorus and potassium fertilizers on yield and economic benefit of late rice,and combining with production practice,the fertilizer application amount was determined by establishing fertilizer effect model.[Result] The yield and economic benefit of late rice increased significantly with nitrogen and potassium fertilizer application and their highest yield gain were 1 288 and 555 kg/hm2,the corresponding increscent rate were 23.7% and 8.8%,and the net income were 1 195 and 350 yuan/hm2,respectively.However,the effect of phosphorus fertilizer was not remarkable.Combining with factual condition and according to fitting one-place quadratic fertilizer effect model,fertilizer application amount of nitrogen phosphorus and potassium fertilizers for highest yield were 149,61 and 116 kg/hm2,the optimum fertilizer application amount for the highest economic benefit were 122,46 and 45 kg/hm2,respectively.[Conclusion] Late rice had obvious high-yield and economic benefit effect by rational fertilization.However,when fertilizer application amount exceeded a certain range,the yield and economic benefit of rice showed downtrend.