Humic acid slowly available fertilizer and preparation method thereof

Abstract

The invention discloses a humic acid slow release fertilizer and the preparation method, which uses the lignite as raw material, the preparation method is as follows: first adding the lignite and the nitric acid first to the reactor, agitate, enabling to react, and filtrate after stirring for 20 to 40 minutes; then adding strong ammonia into the filtered materials; adjusting the pH to 7 to 9, finally adding nitrogenous fertilizer, the phosphate fertilizer and the potassium fertilizer into the humic acid after the adjustment of pH value and stirring for 30 to 45 minutes. The humic acid slow release fertilizer has nitrogen of different morphas, and the ions have both the absorption state and ionized state, thus can satisfy the short-term and the long-term demand of the crops to the nutrients. The raw material is the cheap humic acid which is an inexpensive non-pollution high polymer organic compound with no side effects to the soil and no residues after the application of the fertilizer. The humic acid slow release fertilizer has the advantages of simple preparation method, needing no large-scale equipment, and low cost.

Description

technical field [0001] The invention relates to a slow-acting humic acid fertilizer prepared from lignite and a preparation method thereof. Background technique [0002] The role of fertilizers in agricultural and forestry production is beyond reproach and plays an irreplaceable role. However, in recent years, the increased yield of grain per unit of chemical fertilizer has decreased significantly with the increase of chemical fertilizer application, and the utilization rate of fertilizer has been very low. Therefore, research on slow / controlled release fertilizers has attracted more and more attention. [0003] There are many types and quantities of slow / controlled release fertilizers, but the current market is mainly coated controlled release fertilizers, which use urea or compound fertilizers with different contents as the core of the fertilizer, and use different binders to spray on the surface. Sulfur, calcium magnesium phosphate fertilizer or different types of polyet...

AI Technical Summary

Problems solved by technology

This method has played a great role in the slow release of nutrients, and can achieve the purpose of slow release or controlled release, but the disadvantages are also obvious, first of all, the cost is high, various coating materials are very expensive, and the production process is complicated. The production conditions require strict control; secondly, in the production process, various coating materials, adhesives and sealing substances remain in the soil and are difficult to degrade in the short term. According to data, adhesives and sealing agents account for a large proportion of slow / controlled release fertilizers. 3-10%, or even higher

Although the residues have no effect in a short period of time, long-term application will leave a large amount of residue in the soil, and the risk of long-term application has not been correctly evaluated

Images