... enrichment of mixture ==> 混合物的浓缩 enrichment of soil ==> 土壤加肥 enrichment plant ==> 浓缩工厂 ...
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推荐稻草还田及有机肥加化肥结构，是高产条件下维持土壤硫素肥力的较佳施肥结构。
Straw and organic matter plus chemical fertilizer constitutions are recommend as optimum to sustains and increase soil sulfur fertilization.
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