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First, it is selected according to the application method. If it is used for flushing, drip irrigation or foliar spraying, it is recommended to use fertilizers such as potassium humate or ammonium humate, or to produce humic acid with the lowest molecular weight, highest activity and direct absorption by plants. Potassium fulvate or ammonium fulvic acid. If it is used for base fertilizer application, it is recommended to choose ammonium humate or ammonium nitro-humate, and pay attention to burying it in the soil. Because ammonium humate is a combination of humic acid and ammonium bicarbonate, it is easy to volatilize. Apply or spray.
Second, choose according to crop category and cost. For field crops, it is recommended to choose humic acid compound (mixed) fertilizer, which is not only convenient to apply, but also cost-effective; for vegetables and fruit trees, you can choose humic acid organic fertilizer, humic acid organic-inorganic compound fertilizer or humic acid trace element fertilizer. The organic matter in these fertilizers can reach 20% to 45%, which can effectively improve the taste and color of crops. Although humic acid can be used in the whole growth period of crops, for economic reasons, it can be applied 1 or 2 times in the key periods after crop transplanting, pre-flowering, expansion, and color-changing period, and the expansion period and color change. The combination of spraying effect will be better.
Second, choose according to crop category and cost. For field crops, it is recommended to choose humic acid compound (mixed) fertilizer, which is not only convenient to apply, but also cost-effective; for vegetables and fruit trees, you can choose humic acid organic fertilizer, humic acid organic-inorganic compound fertilizer or humic acid trace element fertilizer. The organic matter in these fertilizers can reach 20% to 45%, which can effectively improve the taste and color of crops. Although humic acid can be used in the whole growth period of crops, for economic reasons, it can be applied 1 or 2 times in the key periods after crop transplanting, pre-flowering, expansion, and color-changing period, and the expansion period and color change. The combination of spraying effect will be better.
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