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农业生产由多种复杂环节组成。环节之间又相互衔接、彼此联系而形成一个整体多级的生态系统。其中物质转化的形式关系到生产潜力发挥的情况。在能量循环过程中,原来是一级转化的废料,可能会成为二级转化的原料,二级转化的废料,可以成为三级转化的原料,以此类推。这种一级或多级转化的情况是科学水平和社会经济效益的反映。随着科学技术发展,物质转化的经济效率就会越来越高。“秸秆还田”是农业生态系统的一个环节,是肥田增产的措施之一。由于还田方式不同,所产生的经济效益也相差悬殊。其中最简单的方式就是燃烧成灰还田。每百斤秸秆燃烧后
Agricultural production consists of a variety of complex links. Links between the link and link each other to form a multi-level overall ecosystem. One of the forms of material transformation relates to the production potential of the situation. In the energy cycle process, the original is a transformation of waste, may become a secondary conversion of raw materials, secondary conversion of waste, can become a three-stage conversion of raw materials, and so on. This one or more levels of conversion is a reflection of the scientific level and socio-economic benefits. With the development of science and technology, the economic efficiency of material transformation will be higher and higher. “Straw returning” is a link in agro-ecosystem and one of the measures to increase production of fertilizers. Due to the different ways of returning to the fields, the economic benefits produced are also quite different. One of the easiest ways is to burn ash back into the field. After a hundred jins of straw burning