Appropriate application of ammonium bicarbonate in winter, the temperature is low, ammonium bicarbonate is not easily decomposed, is conducive to improving fertilizer utilization; ammonium bicarbonate is ammonium nitrogen fertilizer, can be directly absorbed into the crop after application into the soil, fertilizer efficiency is fast, is a typical "rapid fertilizer" , can provide nitrogen nutrition to crops in time. Some people have experimented with applying ammonium bicarbonate in winter wheat fields, which is 1 to 1.5 times more effective than in hot season. Avoid application of urea urea belongs to ammonium ammonium fertilizer, can not be directly absorbed by the crop after application into the soil, need to be converted into ammonium nitrogen under the effect of urease secreted by urea bacteria in the soil for root absorption. Here, the rate of urea conversion mainly depends on the soil temperature at that time. Under normal conditions, all the urea applied to the soil is converted to ammonium nitrogen, which takes 7 to 10 days at a ground temperature of 10°C, 4 to 5 days at 20°C, and only 2 to 3 days at 30°C. It can be seen that crops are topdressed in winter or early spring. If urea is used, it will often affect the growth of crops because of slower fertilizer effect. The application of phosphorus and zinc fertilizers to the absorption of phosphorus and zinc is significantly affected by temperature and light. Low temperature in winter, lack of light, easy to induce winter crops lack of phosphorus, zinc, should be appropriate increase in phosphate fertilizer and zinc fertilizer. In addition, phosphorus can enhance the cold resistance of plants, and the increase of phosphate fertilizer also helps prevent crops from freezing.
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