Fitting Analysis of Nitrogen Release from Stable Fertilizer for Paddy Field and Rice Nitrogen Absorption in Growth Period

Zhao Mingxuan; Wang Xin; Zhang Chang'ai; Shan Shengdao; Yu Wenhao

doi:10.14083/j.issn.1001-4942.2025.04.016

Abstract：In rice production,if the nutrient supply of fertilizers is consistent with the nutrient demand of crops,the nutrient absorption of crops would be promoted,and then the crop yield and fertilizer utilization rate could be increased.In this study,the stable fertilizer for paddy field,compound fertilizer,controlled-release fertilizer and slow-release fertilizer were used as test materials to measure the nitrogen release amount in hydro-static water,the nitrogen release ratio at hydrostatic water stage,and the nitrogen absorption amount and ratio of potted rice at different stages after fertilization,and then the fitting degree between nitrogen release ratio and nitrogen uptake ratio of rice at different stages was analyzed by grey correlation analysis.The results showed that the relational degree of nitrogen release ratio at hydrostatic water stage of the four fertilizers with the nitro-gen uptake ratio at different growth stages of rice were 0.85,0.70,0.78 and 0.71,respectively,and the rela-tional degree of stable fertilizer for paddy fieldincreased by 21.43％,8.97％and 19.72％compared with com-pound fertilizer,controlled-release fertilizer and slow-release fertilizer,respectively.Based on the relational degree from large to small,the four fertilizer could be ranked as stable fertilizer for paddy field,controlled-re-lease fertilizer,slow-release fertilizer and compound fertilizer,which was consistent with the order of rice yield in the pot experiment.The rice yield of stable fertilizer for paddy field increased by 60.93％,21.63％and 56.51％compared with compound fertilizer,controlled-release fertilizer and slow-released fertilizer,respec-tively.The results of this study indicated that the stable fertilizer for paddy field was more suitable for rice pro-duction than the other three fertilizers in the pot experiment conditions.