1. Full firepower, sufficient water and short timeThe strong firepower keeps the water boiling all the time, and enough water ensures that it will not cool down by adding water in the middle. In boiling water, the oxidase in vegetable quickly loses its activity and there is almost no oxygen in boiling water, thus increasing the oxidative loss of vitamin C and other nutrients.2. Refueling with salt

1. Temperature is not suitableMelon vegetables suffer from high temperature and cold injury during their growing period, especially low ground temperature, which causes root dysplasia and reduces their absorption ability, resulting in insufficient nutritional supply of melon strips and melon melon.Temperature is very important for greenhouse cultivation. When the daytime temperature in greenhouse