随着世界人口的逐年增长和各方面对粮食、饲料需要量的急剧增加,七十年代以来,间套复种不仅在地少人多的东南亚、南亚、西亚、亚洲东部及拉丁美洲许多国家中发展较快,而且随着土地费用和农产品价格的提高,以及受世界能源短缺的影响,北美和欧洲一些传统进行一年一作的国家也开始重视间套复种和与其有关的科学研究工作. With the world population growing year by year and the sharp increase in the demand for food and feed in various fields, it has not only been found in the less developed countries in Southeast Asia, South Asia, West Asia, eastern Asia and Latin America since the 1970s The development is fast and with the increase in land costs and agricultural prices and the impact of the world’s energy shortages, some of the traditional year-by-year North American and European countries have begun to value cropping and related scientific research.