In winter, the temperature is low, the ability of microorganisms in the soil is weakened, and the rate of converting fertilizers becomes slower. In order to meet the needs of vegetable growth in winter, quick-effect fertilizers should be applied. Nitrogen fertilizer can use ammonium bicarbonate. Phosphate fertilizer can use superphosphate. Potassium fertilizer can use potassium chloride (potassium sulfate should be used in the late growth period for crops such as potato and tomato). Note that it is best not to apply ammonium bicarbonate in greenhouse vegetables, use ternary compound fertilizer to prevent ammonia poisoning.
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