Generally speaking, there are two reasons for bread garlic. First, it is cultivated too early, and the ground temperature is very high after film mulching, which affects the growth of roots. Second, nitrogen fertilizer is applied in a partial way, and a small number of growers think that it will work if it is fertilizer, and they do not apply fertilizer according to the law of garlic's fertilizer demand! Garlic should use potassium sulfate15-15-15-17-17/18-. Root rot of dead seedlings after turning green or harm of underground pests.