间、套、复种是我国劳动人民在数千年生产实践中积累起来的宝贵经验,是充分利用地力和空间,争取生长季节的有效措施。北京市郊区几次粮食产量大幅度提高,都与耕作制度的改革有关。一、京郊耕作制度改革的新动向为了进一步挖掘土地潜力,加速实现农业机械化的进程,郊区广大贫下中农积极开展耕 It is an invaluable experience accumulated by thousands of years of production practice among the working people in our country and is an effective measure to make full use of the earth’s force and space for the growing season. A few substantial increases in grain output in the suburbs of Beijing have been related to the reform of the farming system. I. New Trends in the Reform of the Tillage System in the Outskirts In order to further tap the potential of the land and speed up the process of agricultural mechanization, the vast majority of poor and middle-aged peasants in the suburbs actively develop tillage