Zinc humic acid urea belongs to simple fertilizer, only contains nitrogen, does not contain phosphorus and potassium, and can be mixed with other fertilizers such as diammonium phosphate, superphosphate, potassium chloride and potassium sulfate, so as to meet the various nutrients of crops. The demand can also play a synergistic role between fertilizers to improve fertilizer efficiency. However, urea cannot be mixed or applied with alkaline fertilizers such as plant ash, calcium magnesium phosphate, etc., because urea must be converted into ammonium nitrogen after being applied to be absorbed and utilized by crops. Under alkaline conditions, most of the nitrogen will become ammonia and volatilize. The correct way is that urea and alkaline fertilizer should be staggered for 3 to 4 days in summer and autumn, and staggered for 7 to 8 days in winter and spring. In addition, urea is also not suitable for application in combination with ammonium bicarbonate.
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