Winter and spring low temperature season, crop fertilization has a lot of stress: 1 should be applied to ammonium bicarbonate: low temperature in winter, ammonium bicarbonate is not volatile decomposition, is conducive to improve fertilizer utilization; 2 avoid urea: urea is an amido ammonium fertilizer, after application to the soil Can not be absorbed and utilized by crops, need to be converted into ammonium nitrogen in the soil under the action of urea-secreted urea, which can be absorbed by roots. It takes 7-10 days at ground temperature of 10 °c and 4-5 at 20 °c. It takes 2-3 days at 30 °c. 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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