晚稻肥料利用率试验研究及优化建议OA

Taking the late rice variety BoⅡYou 629 planted in Qiaotou Town,Chengmai County,Hainan Province as the research object,field comparative experiments were conducted to explore the effects of optimized fertilization(N2P2K2)and conven-tional fertilization(CON)on rice yield and fertilizer utilization rate.Six treatments were set up in the experiment,including no fertilization treatment,nutrient deficiency treatments,and optimized fertilization treatment,and the rice yield,agronomic effi-ciency,and nutrient uptake amounts of nitrogen,phosphorus,and potassium were determined.The results showed that there was no significant difference in rice yield between optimized fertilization(N2P2K2,5 497.5 kg·hm‒2)and conventional fertili-zation(5 485.5 kg·hm‒2),while the nitrogen fertilizer utilization rate(35.7%)and phosphorus fertilizer utilization rate(13.1%)under optimized fertilization were significantly higher than those under conventional fertilization(31.5%and 4.4%,respec-tively),and there was no significant difference in the potassium fertilizer utilization rate between the two fertilization modes.Optimizing fertilization achieved a stable rice yield by reducing the application rates of nitrogen and phosphorus fertilizers(N application reduced by 28.0%and P application reduced by 80.0%),indicating scientific fertilizer input and improved fertilizer utilization efficiency.This study provides technical support for the green production of rice in Hainan.