Fertilizer in winter should choose quick-acting fertilizer
In winter, the temperature is low, and the ability of microbes to move is weakened. The fertilizers that need to be converted have a slow effect, and the winter sowing crops need to have sufficient fertilizers. The solution to the conflict is to catch up with available fertilizers.
Nitrogen fertilizer can use ammonium bicarbonate; Phosphorus fertilizer should use superphosphate as possible; Potassium fertilizer can use potassium chloride (but potato and tomato and other chlorine crops should use potassium sulfate in the late growth stage); 45% can be used for compound fertilizer. Compound fertilizer; farmyard manure available for human fecal urine.
This is because, compared with urea, ammonium bicarbonate belongs to ammonium nitrogen fertilizer and can be directly absorbed and utilized by crops after application to soil, unlike urea (which belongs to ammonium ammonium fertilizer and needs urease secretion from urea bacteria in soil. The transformation into ammonium nitrogen can only be absorbed by the root system.) Fertilizing is affected by the low temperature and the effect of the fertilizer is slow to affect crop growth.
Superphosphate contains 14% to 20% of effective phosphorus pentoxide (80% to 95% of which are soluble in water). It is a water-soluble, quick-acting phosphate fertilizer. Its fertility is faster than that of calcium, magnesium and phosphate fertilizers. However, we must pay attention to the greenhouse vegetable is best not to use ammonium bicarbonate, and switch to 45% ternary compound fertilizer to prevent ammonia harm. Phosphorus is easily absorbed by the clay and fails to cure. When used as top dressing, superphosphate extract (5% to 10% concentration) may be used or concentrated in the root-intensive soil layer in the early stage of the crop.
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