农作物的间、混、套、复种在我国农业生产上有着悠久的历史。无产阶级文化大革命以来,辽宁省贫下中农从当地实际出发,在三大革命运动实践中对间、混、套、复的作物安排,栽培技术不断地改进、丰富、提高,创造出以玉米为主的宽档间种,并实行以间为主间中有套,以间为主间中有复,将合理密植提高到了一个新的阶段。目前已成为我省提高产量的重要途径之一。推广间、混、套、复种是农作制度的改革,涉及许多问题,如宽档间种能不能增产,怎样才能增产,如何因地制宜推广等。为此,我们于1970～1971年进行了调查研宪,现根据调查材料,提出我们一些不成熟的看法,仅供参考. Crops, mixed, sets, multiple cropping in China has a long history of agricultural production. Since the Great Proletarian Cultural Revolution, the poor and middle peasants in Liaoning Province, proceeding from the actual conditions of the country, have continuously improved, enriched and improved crop arrangements and cultivation techniques in the three major revolutionary campaigns in order to create a corn-based Wide range of species, and the implementation of the main inter-between sets, between the main room complex, the rational close planting to a new stage. Nowadays it has become one of the important ways to increase output in our province. The promotion of intercropping, mixing, multiplication and multiple cropping is a reform of the farming system and involves many issues such as whether the wide variety can increase production, how can the production increase and how to promote it according to local conditions. For this reason, we conducted a constitutional investigation and constitutional investigation in 1970-1971. Based on the survey materials, we now present some unwise opinions about us for reference purposes only.