[Objective] The research aimed to explore suitable improvement measures for middle-low yield field.[Method] An experiment was carried out to study the effects of agricultural residue on soil nutrient and crop yields.[Result]Compared with no fertilizer and chemical fertilizer,fertilizer with straw and biogas residue had a more significant effect on reducing soil bulk density and increasing soil organic matter and available P. The treatment of fertilizer and straw could increase available K obviously. Under d...
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