Pouring frozen frozen water to seal frozen water must be "certain" and "secondary". "Determined" is based on the amount of soil moisture decided not to pouring frozen water. Generally, the absolute water content of sandy loam is less than 15%, the loam is less than 17%, and frozen water should be poured when the clay is below 20%. “Two kinds of fitness†means timely watering and appropriate amount of watering, and generally it is appropriate to connect the groundwater. The overwintering of fertilizer for wintering can increase the nutrient content of the soil. It can be used as a spring fertilizer for winter, and it can promote weak and strong growth. Generally, 10 kg of urea or 20 kg of ammonium sulfate can be applied to the soil, and the fertilizer can be added with water. The cold weather in the northern part of the cold-proof area is very unfavorable for safe wintering of the seedlings. Therefore, the cover should be used to prevent cold and ensure that the seedlings can safely pass winter. Coverage can generally be carried out after all the soil in the plough layer is frozen. Covers are organic fertilizers that are organic and broken down. Cooking Wine,Rice Cooking Wine,Onion Ginger Cooking Wine,Sour Cooking Wine Chinese Seasoning (Shandong) Trading Co.,Ltd , https://www.zt-trading.com