Which fertilizers should not be applied at low temperature

Affected by the low temperature in winter, some fertilizers are more suitable for application, while some fertilizers are not suitable.

It is suitable to apply ammonium bicarbonate in winter. The temperature is low and ammonium bicarbonate is not easy to volatile and decompose, which is beneficial to improve fertilizer utilization. Ammonium bicarbonate is an ammonium nitrogen fertilizer, which can be directly absorbed and used by crops after being applied to the soil. The fertilizer is fast and belongs to a typical "quick fertilizer". , Can provide nitrogen nutrition for crops in time. According to experiments, topdressing ammonium bicarbonate in winter wheat fields can increase the fertilizer efficiency by 1 to 1.5 times in the hot season.

Do not apply urea Urea belongs to acylammonium nitrogen fertilizer. After it is applied to the soil, it cannot be directly absorbed and utilized by crops. It needs to be converted into ammonium nitrogen under the action of urease secreted by urea bacteria in the soil to be absorbed by the roots. The rate of urea conversion mainly depends on the soil temperature. If all the urea applied to the soil is converted into ammonium nitrogen, it will take 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 topdressing crops in winter or early spring, if urea is applied, will often affect crop growth due to slow fertilizer effects.

Increased application of phosphorus and zinc fertilizers The absorption of phosphorus and zinc by crops is significantly affected by temperature and light. Low temperature in winter and insufficient light can easily induce phosphorus and zinc deficiency in over-wintering crops. Phosphate and zinc fertilizers should be appropriately increased. In addition, phosphorus can enhance the cold resistance of plants, and increased application of phosphorus fertilizer is beneficial to prevent and control crop freezing damage.

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