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前言随着世界性人口爆炸,能源短缺,耕地减少等问题的日益严重,如何经济地利用有限的耕地,已成为世界农业科技发展突出的研究课题。新中国成立40多年来,农业科学技术有了显著的发展,生产条件也有了明显的改善。为解决我国的粮食问题,在中国共产党领导下,已将计划生育工作纳入基本国策,全面有效地限制了人口的过速增长;农业上大力提倡多熟(即利用间作、套种和复种)种植,以提高单位面积产量和产值。复种指数已从1952年的130.9%,增加到1984年的147.6%,在1978年达到高峰时为151.0%,
Preface With the worldwide population explosion, the shortage of energy and the reduction of cultivated land are increasingly serious. How to use limited cultivated land economically has become a prominent research topic in the world agricultural science and technology development. Over the past 40 years since the founding of New China, there has been notable progress in agricultural science and technology, and production conditions have also been significantly improved. In order to solve the food issue in our country, under the leadership of the Communist Party of China, family planning work has been incorporated into the basic national policy, which has effectively and completely limited the excessive growth of population. In agriculture, we vigorously promoted the cultivation of multiple crops (inter-cropping, interplanting and multiple cropping) In order to improve production and output per unit area. The multiple cropping index has risen from 130.9% in 1952 to 147.6% in 1984 and reached 151.0% at the peak in 1978,