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我国大部分地区位于温带,部分地区处于亚热带、热带,无霜期长,雨量充沛,农业自然条件十分优越,适合栽种的农作物种类繁多,尤其在长江以南地区,几乎一年四季都有农作物生长。我国农民在长期生产实践中,由于掌握了自然规律和各种农作物的生育特性,为了争取作物的及时播种和利用作物的种间互助,充分利用土地、阳光,以提高单位面积年产量,各地区农民早就因地制宜地创造了多种多样的间作与混作,它在我国农业
Most parts of China are located in temperate zone, with some areas in subtropical zone, tropical zone, long frost-free period and plenty of rainfall. Agricultural natural conditions are very good. There are many kinds of crops suitable for planting, especially in south of the Yangtze River. In the long-term production practice, peasants in our country have grasped the laws of nature and the reproductive characteristics of various crops. In order to win the timely sowing of crops and use their mutual assistance among crops and make full use of land and sunshine to increase the annual output per unit area, Farmers have long ago created a wide range of intercropping and mixing practices according to the local conditions and it is in agriculture in our country