Effects of organic fertilizer application on yield and nitrogen fertilizer utilization in mid-season rice-ratooning rice
A field experiment was conducted to study the effects of organic fertilizer application on yield,nitrogen fertilizer utilization and soil fertility of the mid-season rice-ratooning rice to provide technical and theoretical support for high yield and high economic return of mid-season rice-ratooning rice in paddy field.Two rice cultivars,Zhunliangyou 608(ZLY 608,2018)and Jingliang-youhuazhan(JLYHZ,2019)were selected and four treatments were set as follows:planting azolla(OM1),planting green manure and straw return(OM2),pig manure application with 15%chemical fertilizer reduction(OM3)and chemical fertilizer application(CK).Rice yield,yield components,nitrogen utilization and soil fertility were examined.Compared with CK,organic fertilizer application significantly increased the yield of mid-season rice-ratooning rice by 12.0%～25.0%and 16.7%～26.3%in main season and ratooning season,respectively(P<0.05).Organic fertilizer application significantly increased the number of grains per panicle in the main season and productive panicle in the two seasons(P<0.05).Organic fertilizer application significantly increased the dry matter accumulation at each stage by 27.0%～83.3%(P<0.05).Organic fertilizer application significantly increased the nitrogen partial factor productivity(NPFP)by 41.1%in the main season and 33.0%in the ratoon season in OM3(P<0.05).However,the nitrogen use efficiency(NUE)of mid-season rice-ratooning rice was decreased by 21.4%～32.9%,13.2%～22.7%in the main season and ratoon season,respectively(P<0.05).To some extent,organic fertilizer application significantly improved the soil fertility in the mid-season rice-ratooning rice system(P<0.05).Compared with CK,OM1 significantly increased the alkaline nitrogen content,OM2 significantly increased the available phosphorus,available potassium,organic matter and total potassium,OM3 signifi-cantly increased the alkaline nitrogen,available phosphorus,organic matter and total phosphorus(P<0.05).In conclusion,organic fertilization significantly improves the yield,nitrogen utilization and soil fertility in mid-season rice-ratooning rice system,and the performance of the three modes is in the order of OM3>OM2>OM1.
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