The big bell-mouth period of corn is a critical period for the growth and development of corn, and it is a stage where vegetative growth and reproductive growth go hand in hand. In order to ensure high yield and stable production of corn, the following management techniques must be mastered: 1, scientific fertilizer. The big bell-mouth period is a period in which corn needs the most amount of fertilizer and needs the greatest fertility. At this time, the farmer should be instructed to top-dress fertilizer according to the soil fertility and seedlings, topdressing 20-30 kg of urea per mu and covering the soil after fertilization. 2, cultivator soil. By cultivating the soil can improve the permeability of the soil, thicken the plant base soil layer, promote root growth, and prevent plant lodging. At the same time, weeds can be removed to ensure water conservation. 3, timely watering. Maize big bell-mouth period is the key period of water demand. After fertilization, watering can change the microclimate in the field, which is beneficial to corn pollination and improve the seed setting rate. 4, control of pests and diseases. At this time, the occurrence of pests and diseases should be investigated at any time in the field. It was found that corn glutinous rice cakes were prepared with 1.5% sodium sulphite granules, 0.5 kg/mu, and the control effect was good. At the same time, we must also pay attention to the inspection of armyworm and aphids. We must be diligent in checking and early prevention and treatment of corn, small spot disease, and rust. Injection Solution,Compound Vitamin B Injection,Astragalus Polysaccharide Injection,Sulfamonomethoxine Sodium Injection Sichuan Aibang Weiye Biological Engineering Co., Ltd. , https://www.aibangpharm.com