First, the humic acid fertilizer is selected according to the application method.
If used for rinsing, drip irrigation or foliar application, it is recommended to use potassium humate, ammonium humate or potassium folate, ammonium folate. If used as a base fertilizer, it is recommended to choose ammonium humate or ammonium nitro-humate, and pay attention to bury it in the soil. Since ammonium humate is a mixture of humic acid and ammonium hydrogencarbonate, it is easily volatilized.
Second, humic acid fertilizers are selected based on crop preferences and growth nodes.
Taking fruit trees as an example, phosphate fertilizer and potassium fertilizer are applied in autumn, nitrogen fertilizer is applied in spring, phosphorus fertilizer and potassium fertilizer are applied in germination and differentiation, nitrogen and potassium fertilizer are used, and fruit is expanded in calcium and micro-fertilizer.
Finally, humic acid fertilizers are selected based on crop type and cost.
Humic acid fertilizer is divided into humic acid simple fertilizer, humic acid compound fertilizer, humic acid organic fertilizer, humic acid organic-inorganic compound fertilizer and humic acid trace element fertilizer according to the type and quantity of nutrients.
For field crops, it is recommended to choose humic acid compound fertilizer, which is convenient to use and economical and efficient. For vegetables and fruit trees, you can choose humic acid organic fertilizer, humic acid organic-inorganic compound fertilizer or humic acid trace element fertilizer, organic matter in these fertilizers. Up to 20% to 45%, can effectively improve the taste and color of crops.