Winter and spring low temperature season, crop fertilization has a lot of attention:
　　 1. Suitable ammonium bicarbonate: The temperature in winter is low, and ammonium bicarbonate is not volatile and decomposes, which is beneficial to improve fertilizer utilization.
　　 2 , avoid applying urea: Urea belongs to the ammonium amide fertilizer. After being applied to the soil, it can not be absorbed and utilized by the crop. It needs to be converted into ammonium nitrogen in the soil to be absorbed by the root system. The ground temperature is 10 when required ° C 7-10 days, when the need to 20 ° C 4-5 days, when the need to 30 ° C 2-3 days. It can be seen that crops are topdressed in winter or early spring, which tends to affect crop growth and reduce fertilizer efficiency because of slow fertilizer effect.
　　 3. Increased application of phosphorus and zinc fertilizers: In winter, the temperature is low and the light is insufficient. It is easy to induce phosphorus and zinc deficiency in wintering crops. Phosphate fertilizer and zinc fertilizer should be added appropriately.
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