Journal of Zhejiang Agricultural Sciences ›› 2026, Vol. 67 ›› Issue (2): 288-292.DOI: 10.16178/j.issn.0528-9017.20240486

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Effects of nitrogen reduction combined with organic fertilizer application on yield,nitrogen use efficiency and soil fertility in double-cropping rice system

MA Liya1(), HU Zefan1, ZHANG Yuanyuan2, YE Tingyun1, WANG Feng3, CHEN Zhaoming3()   

  1. 1.Rui′an Municipal Bureau of Agriculture and Rural Affairs,Rui′an 325200,Zhejiang
    2.Pujiang Municipal Bureau of Agriculture and Rural Affairs,Pujiang 322200,Zhejiang
    3.Institute of Environment,Resource,Soil and Fertilizer,Zhejiang Academy of Agricultural Sciences,Hangzhou 310021,Zhejiang
  • Received:2024-06-20 Online:2026-02-28 Published:2026-03-07

Abstract:

A field experiment was conducted in southern Zhejiang to investigate the effects of different fertilization methods on double-cropping rice yield,nitrogen use efficiency,and soil fertility. Four treatments were established:no nitrogen fertilizer (T1),conventional nitrogen application (T2),20% nitrogen reduction (T3),and 20% nitrogen reduction combined with organic fertilizer (T4). Results indicated that compared with T1,treatments T2,T3,and T4 increased early rice yield by 47.6%-58.5% and late rice yield by 46.0%-52.5%. Compared with T2 treatment,T3 treatment showed no significant difference in the yield of early rice,late rice,and total yield,whereas T4 treatment significantly increased early rice yield,with no significant difference in late rice yield or total yield. In terms of nitrogen uptake,no significant difference was observed between T3 and T2 treatments in grain,straw,or total nitrogen uptake for both early and late rice. T4 treatment significantly increased straw and total nitrogen uptake in early rice than those of T2 treatment,as well as grain and total nitrogen uptake in late rice. Nitrogen use efficiency for both early and late rice in T3 and T4 treatments was significantly higher than that in T2 treatment,with T4 treatment being significantly higher than T3 treatment. Compared with T2 treatment,T4 treatment significantly increased soil pH value,total nitrogen,and available phosphorus content,while no significant changes were detected in soil available nitrogen,organic matter,or available potassium content. Therefore,combining 20% nitrogen reduction with organic fertilizer (T4 treatment) can maintain rice yield while improving nitrogen use efficiency and soil fertility.

Key words: double-cropping rice, organic fertilizer substitution, yield, nitrogen use efficiency, soil fertility

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