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在农田生态系统中,较易实现定量控制的是物质循环中的定量调节与控制.用经济学的观点和方法,根据资源特点,科学投入,在保护资源的基础上,充分发挥其生产能力,努力达到最大经济效益,这就是定量调节与控制的目的。各种农产品及投入的生产资料的定量标准,均按其所含氮(N),五氧化二磷(P_2O_5)氧化钾
In the agroecosystem, quantitative control is easier to achieve quantitative control in the material cycle of quantitative regulation and control.Using economics point of view and methods, according to the characteristics of resources, scientific input, based on the protection of resources, give full play to its production capacity, Efforts to achieve maximum economic efficiency, which is the purpose of quantitative regulation and control. All kinds of agricultural products and input of the means of production of quantitative standards, according to their contained nitrogen (N), phosphorus pentoxide (P_2O_5) potassium oxide