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；
Crop rotation is a simple and effective technique used in organic agriculture to reduce the need for pesticides and improve soil fertility.
轮作是应用于有机农业上的一种简单而有效的技术，能减少农药的使用和提高土壤肥力。
A team of UK scientists says a recently discovered hormone could potentially form the basis of an effective and less risky fertility treatment.
英国的一组科学家称，以近期发现的一种激素为基础，可能产生一种不孕症的新疗法，这种方法不但有效，且风险很低。
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