确定推广某项措施,要从这一措施的经济效益、生态效益和社会效益来考虑,特别是社会效益的好坏,更要引起重视。只从经济效益出发,推广棉田间作瓜类作物是不科学的,从生态效益和社会效益考虑,棉花不宜与瓜类作物间作。从生态效益来看,棉花与瓜类作物间作,会加重病虫害发生危害。首先,枯萎病是棉花和瓜类共生的病害。虽能用药剂处理种子,解决种子带菌问题,但土壤带菌还是无法解决。在有枯萎病的地块,实行棉花与瓜类作物间作,给病菌提供了互相侵染的机会,菌源越积越多,造成病害越来越重。在没有病的地块推广这种间作方式,因种子带 Determine the promotion of a measure, from the economic benefits of this measure, ecological and social benefits to consider, especially the social benefits of good or bad, but also to pay attention. Only from the economic benefits, promotion of cotton fields for melons crops is unscientific, from the ecological and social benefits, cotton and cucumber crops should not intercropping. From the ecological point of view, cotton and melon crops intercropping, pests and diseases will increase the harm. First, blight is a disease of symbiosis between cotton and melons. Although the seeds can be treated with agents to solve the problem of seed carrying, but the soil can not be solved. In wilt plots, the implementation of intercropping of cotton and melon crops, to bacteria provide an opportunity for mutual infection, accumulating more bacteria, causing more and more serious diseases. Popularize this intercropping method in the disease-free plots, because of the seed band