Fertilization of winter vegetables should be based on quick effects

        In winter, the temperature is low, the activity of microorganisms is weakened, and the fertilizers that need to be converted have a slow effect. However, vegetables need sufficient fertilizers to grow in winter. The solution to this contradiction is to apply quick-acting fertilizers.

        Ammonium bicarbonate can be used as nitrogen fertilizer, superphosphate can be used as much as possible as phosphorus fertilizer, potassium chloride can be used as potash fertilizer (but potassium sulfate should be used in the middle and late growth stages of crops that avoid chlorine, such as potatoes and tomatoes), 45% triple compound fertilizer can be used as compound fertilizer, and decomposed human feces and urine can be used as farmyard manure. This is because, compared with urea, ammonium bicarbonate is an ammonium nitrogen fertilizer, which can be directly absorbed and utilized by crops after being applied to the soil. Unlike urea, which is affected by low temperatures and has a slow fertilizer effect, thus affecting crop growth, it is an acyl ammonium nitrogen fertilizer, which needs to be converted into ammonium nitrogen by the action of urease secreted by urea bacteria in the soil before it can be absorbed by the roots. Superphosphate contains 14% to 20% effective phosphorus pentoxide (80% to 95% of which is soluble in water), and is a water-soluble quick-acting phosphate fertilizer, and its fertilizer effect is faster than calcium magnesium phosphate.