Study on Formulated Fertilization of Nitrogen,Phosphorus and Potassium Fertilizer for Rice in Baoting County

[Objective] The scientific basis of prescription fertilization of rice in Baoting county was provided through the research on the best ratio of nitrogen,phosphorus and potassium fertilizer.[Method] The effect of the different fertilization program on yield components and yield of rice Shennong 326 variety was experimented with the optimal regression design(3414) and the recommended fertilization for rice was determined.[Result] With the increment of nitrogen,phosphorus and potassium fertilizer,the available panicle and grain number per spike were firstly increased and then decreased.The rate of seed-setting was decreased with the increment of nitrogen and phosphorus fertilizer.The nitrogen,phosphorus and potassium fertilizer had no signification effect on grain weight.The multiple linear regression analysis concluded that the highest yield was 7 977.75 kg/hm2,the appropriate application rate of nitrogen,phosphorus and potassium fertilizer was 211.20,69.90,183.60 kg/hm2.[Conclusion] In the experimental condition,the nitrogen fertilization could result in the best efficiency;then,the phosphorus and last the potassium.Combined with local production practice,the recommended application rate of nitrogen,phosphorus and potassium fertilizer was 150 ～ 180、 60 ～ 75、105 ～ 135 kg/hm2,the rational proportion of nitrogen,phosphorus and potassium fertilizer was 1∶(0.40 ～ 0.50)∶(0.70 ～ 0.90) in Baoting county of Hainan province.