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我国自古以农桑立国,在农业生产上积累了丰富的经验。因时制宜、因地制宜、因物制宜的三宜理论,就是古代农学中具有丰富的朴素唯物论和辩证法思想的理论之一。经过几千年农业生产实践证明,它具有宏观指导意义。农业的丰收与否,其重要的因素之一是能否因地制宜、合理使用土地。汉成帝时,氾胜之总结了农业生产经验,作书十八篇,对于节候、辩土、施肥、选种、下种、御旱
Since ancient times, our country has established a rich experience in agricultural production. One of the theories of ancient theory of agriculture that is rich in simple materialism and dialectical thought in ancient agronomy is the theory of appropriateness and appropriateness in accordance with local conditions and appropriate measures. After several thousand years of agricultural production practice has proved that it has the macro-guiding significance. One of the important factors of whether or not the harvest of agriculture is good is whether land can be rationally used according to local conditions. Han Cheng Di, pan-win summed up the experience of agricultural production, writing eighteen, for the node, soil, fertilization, selection, under the kind of drought