We had researched the
returning field of straws for more 10 years, the result showed the returning field of straws made the
organic
substance and the compound-body of organic substance and inorganic substance increase, the mostly physics character and structure of soil have more improved, the contents of quick result K, quick result P, availability P, full N had more improved, the biology vitality of soil boosted up, productivity had increased, ripe had increased production. The mode of
returning field of straws saved labour and improved effect. At present it was used much. But it had the flaws that influenced the farmers field busywork rotten produced organic acid, animalcule disputed the fertilizer with seedling, broadcasted diseases etc. The returning field of straws can settle effectively these problems, but straws caboodle would occupy place, spend more labour, these two modes all did not full utilize the coarse albumen and biology matter energy. So the using of straws must turn to the mode of substance cycle using, energy multilevel conversion.