养分管理对水稻产量及氮肥吸收利用的影响OA

This study mainly focused on the soil nutrient and fertility conditions in the rice-planting region of Jinhua.Under the background of quantitative application of phosphorus fertilizer(P2O5 54 kg·hm-2)and potassium fertilizer(K2O 90kg·hm-2),the effects of nutrient management on rice yield and nitrogen fertilizer absorption and utilization were systematically evaluated.Four treatments were established:no nitrogen fertilizer(PK),low nitrogen fertilizer(N1PK),medium nitrogen fertilizer(N2PK)and high nitrogen fertilizer(N3PK)with N application rates of 0,90,120,and 150 kg·hm-2,respectively.Results indicated that compared with PK and N3PK treatments,the rice yield significantly(p＜0.05)increased in the N2PK treatment,reaching 9 204.60 kg·hm-2,which increased by 34.78％compared with PK treatment.Regarding N fertilizer absorption and utilization efficiency,the N2PK treatment showed significantly higher values compared with the N3PK treatment,with nitrogen fertilizer utilization rate,nitrogen fertilizer agronomic efficiency,and nitrogen fertilizer partial productivity being 65.00％,19.80 kg·kg-1 and 76.71 kg·kg-1,respectively.In terms of economic benefits,the N2PK treatment yielded the highest output value of 26 344.68 yuan·hm-2,representing an increase of 6 402.63 yuan·hm-2 compared with the PK treatment.In conclusion,under the background of quantitative application of phosphorus and potassium fertilizers,he medium nitrogen level treatment(N2PK)not only significantly increased rice yield and optimized the absorption and utilization efficiency of nitrogen fertilizer,but also brought the best economic benefits.This result provides an important theoretical basis and practical guidance for the rational use of nitrogen fertilizer in the rice-growing area of Jinhua.