Film - covered can increase effective fertility of soil, advance nutrient absorption, strengthen photosynthesis.
促进养分吸收，增强光合作用，提高生物产量和经济系数；
Management of potassium resources refers to the rational application of potassic fertilizers and also includes the preservation of potassium fertility in the soil and its effective use.
钾素资源管理不仅指钾肥的合理施用，也包含了土壤中钾素肥力的保持和有效利用。
On the basis of the researches of others, the writer enough considered soil fertility on different soil types, amply calculated soil effective coefficient.
在已有研究的基础上，充分考虑了不同类型土壤的肥力特征，详细地计算了土壤有效系数。
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