Grain and grass composite planting method for intercropping alfalfa with wheat and corn

The invention discloses a grain and grass composite planting method for intercropping alfalfa with wheat and corn. The invention provides the composite planting method for intercropping the alfalfa with the wheat and the corn, and matched technologies such as intercropping belt width regulation and control, a farming method, a fertilizing amount and grain and grass harvesting and utilization are specified. The characteristics of biological nitrogen fixation and long earth surface covering time of alfalfa are utilized, the alfalfa is compositely planted with winter wheat, corn and other grain crops to achieve the effects of reducing the chemical fertilizer application amount, improving light energy and land utilization efficiency and increasing the crop yield, and the problems of grassland soil drying in traditional alfalfa planting, excessive fertilization in food crop production and the like are effectively relieved. The grain and grass composite planting method has wide popularization and application prospe