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三茬套种是北京地区粮食生产中的主要种植方式。一般上茬播种小麦、中茬套种玉米、下茬套种豆类。近几年,有些农民改中茬套种玉米为大豆;下茬套种豆类作物为玉米,经试验证明,效果很好。主要优点(一)充分利用时空条件中茬大豆生长初期正值小麦收获、玉米播种和幼苗生长阶段,光照和通风条件良好,又为大豆生长创造了良好的田间环境条件。在小麦收获前,大豆进行增粗生长,而下茬玉
Three cropping intercropping is the main planting method in grain production in Beijing. In general crop sowing wheat, stubble intercropping corn, intercropping beans under cover. In recent years, some farmers in the stubble intercropping corn as soybeans; next intercropped legumes crops for corn, the test proved that the effect is very good. The main advantages (a) make full use of space-time conditions stubble soybean positive growth in wheat harvest, corn sowing and seedling growth stage, good light and ventilation conditions, but also for the growth of soybean to create a good field environmental conditions. Before the wheat harvest, soybeans grow thick, while the next crop jade