Greenhouse cultivation and management method of high-yield watermelons growing with multiple crops in one year

The invention discloses a greenhouse cultivation and management method of high-yield watermelons growing with multiple crops in one year. The method is characterized in that the greenhouse technology is improved; the planting distance ratio is made to be reasonable; the continuous fruit setting technology is adopted, vegetative growth and reproductive growth are adjusted, watermelon fruit setting and watermelon seedling growth are controlled, the fruit setting number and the weight of a single watermelon are increased, and the yield per plant is guaranteed; nutrient and water management is conducted, wherein base fertilizer is applied to the whole layer, organic fertilizer and inorganic fertilizer are combined, nitrogen fertilizer, phosphorus fertilizer, potassium fertilizer, calcium fertilizer and magnesium fertilizer are in coordination, topdressing is conducted after watermelons are harvested, the amount of fertilizer is determined according to the yield, drop irrigation is conducted with a small amount of