Effects of Replacing Chemical Fertilizer with Biogas Slurry on the Annual Yield and Soil Nutrients of the Rice-Oilseed Rape Rotation System
This study aims to explore the effects of different proportions of biogas slurry replacing chemical fertilizer on the annual yield and benefits and the soil nutrients of the rice-oilseed rape rotation system in the middle and lower reaches of the Yangtze River.In two typical rice-oilseed rape rotation areas(L1 and L2),four treatments including conventional fertilization(B0)and biogas slurry replacing 15%(B15),30%(B30),and 45%(B45)chemical fertilizer were designed,and the crop yield components,topsoil nutrients,and annual yield and benefits were compared among different treatments.The results showed that the annual yields(15.03-15.10 t/hm2)and annual benefits(5.12×104-5.24×104 yuan/hm2)of B15 and B30 were higher than those of other treatments.B15 and B30 showed significantly higher pods per plant(467.1-515.7 pods/plant),seeds per pod(15.6-17.4 seeds/pod),and effective panicles(314.1×104-357.1×104 panicles/hm2)than B0.Moreover,replacing chemical fertilizer with biogas slurry improved the acidity and alkalinity of topsoil,increasing pH by 2.2%-8.1%.However,it had no significant effect on the content of organic matter,available phosphorus,and available potassium in topsoil.Therefore,the suitable proportion of biogas slurry replacing chemical fertilizer in the growing period of oilseed rape in the rice-oilseed rape rotation system is 15%-30%,and the long-term effects of the replacement remain to be studied.
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维普
