Maybe the root system is not repaired in time, or growth is weak, affecting the supply of water and fertilizer caused by plowing and loosening the soil, strengthen the management of water and fertilizer, foliar spraying Bi-Protect plus urea aqueous solution with potassium dihydrogen phosphate, but also can be added to alginate, humic acid, amino acids and other foliar fertilizers with spraying, you can promote the root of the strong seedling, regulate the growth of the enhancement of the resistance to adversity disease resistance, and promote the heart of the vegetable green quickly, growth and robust. At the same time, pay attention to pests and diseases observation and control