基于江苏省4市526份农户调查数据，构建无约束和有约束两个模型，将要素细分为家庭供给和社会供给两类，分析要素供给主体差异对化肥施用量的影响，结果表明：家庭化劳动力投入量、承包地面积和社会化灌溉支出、机械服务支出和租入土地面积均显著影响化肥施用量；但仅有社会灌溉支出对化肥具有较强的替代能力，且能有效弥补家庭小型水利设备的投资不足，而社会化机械服务和雇工因其替代成本过高导致其对化肥的替代并不可行。%This passage selects 526 households survey data of four cities in Jiangsu province, constructs two models with and without constrains, subdivides elements into two types of family and social supply and analyzes the effect on fertilizer amount of different factor input. Results show that the labor and land factors from family and irrigation, machine and land factor from society play a role on fertilizer application. But only irrigation funded by the society can substitute fertilizer, which effectively makes up the investment of small water conservancy facilities, while it is not feasible to substitute fertilizer with machine and labor factors funded by society because of its high replacement cost.
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