不少研究者认为—在非黑钙土地区,多年生豆科牧草,其中包括杂三叶,在覆盖作物下比无覆盖具有生存优势。这首先表现为杂草较少并在间播三叶草的当年,产量有保证。等认为,覆盖作物给种子萌发初期及幼苗期,创造了良好的条件,遮挡了太阳的直射,降低了气温等。但是,三叶草产量的高低,在很大程度上取决于正确的选择和利用覆盖作物。 Many researchers believe that - in non-Chernozem regions, perennial legumes, including miscellaneous trilobes, have a survival advantage over covered crops over no cover. This is first manifested as less weeds and in the year of intercropping clover, yield is guaranteed. The authors believe that covering the crop with seed germination early and seedling stage, creating good conditions, blocking the sun’s direct sunlight, reducing the temperature and so on. However, the level of clover production depends largely on the correct choice and utilization of cover crops.