由土壤养分平衡方程和最小限制因子定律，讨论了因时因地制定施肥策略的必要性。
Based on the balance equation of soil nutrient and the law of the minimum limiting factor, some general principles are proposed for making fertilizer application tactics.
玉米秸秆还田可以培肥地力，平衡土壤养分。
Corn straws as fertilizers may make the soil fertile and balance the nutrients.
土壤养分的平衡分析结果表明，成都平原耕地土壤管理宜采取“稳氮、控磷、增钾”的施肥方法和严格控制各种点源和非点源污染物进入土壤。
The balance analysis results of soil nutrient indicated that the fertilization methods of cropland management in Chengdu Plain were firming nitrogen, controlling phosphorus and increasing potassium.
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