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通过田间试验,研究沼肥替代部分化肥后对杂交水稻产量、土壤肥力及农田养分表观平衡的影响。结果表明,相比减量施肥处理,随配施沼肥用量的增加,水稻产量呈先升高后下降的趋势;施用沼肥后农田有机质、有效磷、速效钾含量明显增加,氮、磷养分出现盈余,钾素亏缺降低;沼肥用量为16.50 t/hm2时可减少30%的化肥用量。施用沼肥可以减少化肥投入,提高土壤养分含量,维持土壤养分平衡。
Field experiments were conducted to study the effects of partial replacement of biogas fertilizer on the yield, soil fertility and apparent nutrient balance of the hybrid rice. The results showed that the yield of rice increased first and then decreased with the increase of the amount of biogas fertilizer applied compared with the reduced fertilization treatment. The contents of organic matter, available phosphorus and available potassium in the farmland increased obviously after application of biogas fertilizer. The contents of nitrogen and phosphorus A surplus appears, and the deficiency of potassium is reduced. When the amount of biogas fertilizer is 16.50 t / hm2, the dosage of fertilizer can be reduced by 30%. The application of biogas fertilizer can reduce input of fertilizers, increase soil nutrient content and maintain soil nutrient balance.