How to choose a more suitable humic acid fertilizer? Experts give 3 suggestions.

The first step is to select humic acid fertilizers according to the application method. If it is used for flushing, irrigation or leaf surface spraying, it is recommended to use chemical fertilizers such as potassium humate and ammonium humate, or use humic acid with a smaller molecular weight. Potassium fulvic acid or ammonium fulvic acid is made of fulvic acid that can be immediately adsorbed by green plants as raw material. Fulvic acid has good water solubility, high vitality, and also has a chelating effect on medium and micro elements. Therefore, it is especially suitable for flushing, irrigation or leaf surface spraying, and potassium fulvic acid has a strong drought resistance; if it is used as a base fertilizer, it is recommended to choose chemical fertilizers such as ammonium humate or ammonium nitro humate. It should be paid attention to burying it in the soil. Since ammonium humate is a combination of humic acid and ammonium bicarbonate, it is very easy to disperse. It is not recommended to irrigate or spray the leaves. In addition, in the soil with a higher pH value Sodium humate cannot be used in the layer (saline-alkali land).

Step 2: Select humic acid fertilizers according to crop hobbies and growth and development nodes. Taking fruit trees as an example, the key to fertilizing in autumn is phosphate fertilizer and potassium fertilizer, the key to fertilizing in early spring is nitrogen fertilizer, the key to budding and splitting is phosphate fertilizer and potassium fertilizer, and the fruit is approaching. In the Pengda period, key nitrogen and potassium fertilizers are required. Therefore, when using humic acid fertilizers, high-nitrogen, high-phosphorus, high-potassium or balanced humic acid fertilizers should be selected according to the factors required for the growth and development stage of crops; in addition, Fertilizers should also be combined with the hobbies of crops. For example, some crops are potassium-loving, such as corn, wheat, tobacco, cotton, sugarcane, etc. For potassium-loving crops, potassium humate fertilizers can also be used. Phosphorus or zinc-loving, etc. The same is true when choosing humic acid fertilizers for crops.

Step 3: Select humic acid fertilizers according to the type of crops and cost. Humic acid fertilizers can be divided into: humic acid simple chemical fertilizer, humic acid compound (mixed) fertilizer, humic acid organic fertilizer, Humic acid organic-inorganic compound fertilizer, humic acid medium micro-element fertilizer, etc. It is recommended to choose humic acid compound (mixed) fertilizer for farmland crops, which is convenient to use and has high cost performance; for vegetable trees and fruit trees , You can also choose humic acid organic fertilizer, humic acid organic-inorganic compound fertilizer or humic acid medium micro-Ransu fertilizer, the organic matter in these fertilizers can also reach 2045%, which can effectively improve the taste and quality of crops. Color; if it is used for flushing or spraying on the surface of leaves, it is recommended to choose a water-soluble fertilizer containing humic acid or fulvic acid. Although this type of fertilizer is expensive, it has good effect and good effect, so it is more valuable for additional use. High crops. Although humic acid can be used in the whole growth period of crops, due to economic development considerations, it can also be applied 1-2 times in each of the four critical periods of crop transplanting, before flowering, Pengda, and color change. , The combined spraying effect of Pengda period and color change period will be better.

After doing the above 3 steps, choosing a good humic acid fertilizer is not a problem.