近几年来,国外耕作制度的发展概括起来有两个明显的趋向:一是在种植制度上熟制由少到多;二是在耕作次数上由多到少。这一方面是由于人口的增加耕地面积相对减少,对粮食、饲料和工业原料等要求不断增加,迫使人们除扩大耕地和提高单产外,为寻求新的增产途径,积极发展多熟种植;另一方面为了减少能源的消耗,保持水土,降低成本,努力寻求新的耕作方法来代替传统的耕作法,推广少耕和免耕法。国外的耕作制度就熟制来说,在全世界范围,一年一熟的面积占多数。本世纪70年代以后,多熟制在许多国 In recent years, there have been two clear trends in the development of the foreign farming system. The first is that as few as many are cultivated in the planting system, and the second is the number of times of cultivation being less. On the one hand, due to the relative reduction of arable land due to the increase of population, the demand for food, feedstuff and industrial raw materials is constantly increasing, forcing people to expand their cultivated land and increase their yield. In order to seek new ways of increasing production, In order to reduce energy consumption, maintain soil and water, reduce costs, and strive to seek new methods of farming instead of the traditional farming methods, promote tillage and no tillage. Farming system abroad As far as cooked food is concerned, the area of ​​one-year-olds accounts for the majority in the world. After the 70s of this century, more cooked in many countries