Humic acid fertilizer is an important fertilizer that we often talk about. So what exactly does humic acid fertilizer do? How should it be used? Here is an introduction to the function and application of humic acid fertilizer.
Humic acid fertilizer effect
1. It can improve the utilization rate of nitrogen fertilizer
Nitrogen fertilizer is an indispensable fertilizer for plant growth. It is mainly based on urea and carbon amine. When urea and carbon amine are applied to the ground, they will soon be lost with the air and water. The actual nitrogen nutrients that crops can absorb and use are only 30. %. The aromatic nucleus, hydroxyl, carboxyl and other acidic functional groups in humic acid can react with nitrogen to form a very stable new ion group. These complexes stay in the soil for a relatively long time, and gradually decompose and release nitrogen, allowing plants Slowly absorb.
2. It has a synergistic effect on phosphate fertilizer
After the quick-acting phosphorus fertilizer is applied to the soil, the phosphorus element will be fixed by the metal ions in the soil, so that the quick-acting phosphorus will be converted into late-acting phosphorus or invalid phosphorus. The aromatic nucleus, hydroxyl, carboxyl and other acidic functional groups in humic acid can react with phosphorus to make it soluble phosphorus, which increases the activity of phosphorus and is easily absorbed by plants. According to statistics, after adding humic acid fertilizer, the fertilizer effect of phosphorus fertilizer can be The relative increase is 5-10%.
3. It has a synergistic effect on potash fertilizer
The functional groups in humic acid can also absorb and store potassium ions, which can not only prevent potassium ions from being lost with water in sandy soil, but also prevent the fixation of potassium in clayey soils, which can increase the utilization rate of potassium fertilizer by about 5%.
4. It has the effect of retaining water and fertilizer
Humic acid interacts with calcium ions in the soil to form a flocculent precipitated gel, which can cement the soil together, turning the soil particles into small reservoirs and fertilizer reservoirs that retain water and fertilizer, increasing soil voids and improving Improve the soil water and fertilizer retention capacity.
How to use humic acid fertilizer and matters needing attention
First, choose humic acid fertilizer according to the application method. If it is used for flushing, drip irrigation or foliar spraying, it is recommended to use potassium humate, ammonium humate or potassium fulvic acid and ammonium fulvic acid. If used as a base fertilizer, it is recommended to choose fertilizers such as ammonium humate or ammonium nitrohumate, and pay attention to burying it in the soil when applying it, because ammonium humate is a combination product of humic acid and ammonium bicarbonate, which is easy to volatilize, so it is not recommended to wash Shi or leaf spray. In addition, do not use sodium humate in soils with higher pH (saline soil).
Second, choose humic acid fertilizers according to 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, phosphate fertilizer and potassium fertilizer are applied for germination and differentiation, and nitrogen fertilizer, potassium fertilizer, calcium fertilizer and micro-fertilizer are needed in the fruit expansion period. In addition, fertilization should be combined with the preferences of the crops. For example, fruit trees, solanaceous fruits and vegetables, tobacco, sugar cane, etc. are potassium-loving crops, and the effect of applying potassium humate fertilizer.