Preparation method of acidic soil conditioner containing water-soluble humic acid

Abstract

The invention relates to a preparation method of an acidic soil conditioner containing water-soluble humic acid. The pH value of the acidic soil conditioner is 3.5-5.5, the humic acid in the soil conditioner is water-soluble humic acid, and the acidic soil conditioner is prepared by mixing low rank coal with citrate and water, and heating and reacting the obtained mixture. The preparation method uses the citrate to activate the low rank coal to obtain the acidic soil conditioner, and the activation rate of the water-soluble humic acid is as high as 60% or more. The prepared acidic soil conditioner containing water-soluble humic acid can effectively improve the agglomerate structure of the soil, and also can adjust the pH value of alkaline soil and activate and chelate medium and trace elements in the soil in order effectively increase the crop yield.

Description

technical field [0001] The invention relates to a preparation method of an acidic soil conditioner containing water-soluble humic acid, and belongs to the technical field of soil conditioners. Background technique [0002] The area of ​​alkaline soil in my country is close to 100 million hectares, about 1.47 billion mu, and nearly 500 million mu of farmland is abandoned every year due to production reduction, which makes the area of ​​cultivated land decrease year by year. The pH value in alkaline soil is high, which reduces the activity of large, medium and trace elements such as phosphorus, potassium, calcium, magnesium, silicon, iron, etc., resulting in obstacles to crop nutrient absorption. The secondary salinization is intensified, and the compaction is serious, resulting in a large area of ​​waste of soil resources. 80% of the saline-alkali land in our country has not been effectively developed and utilized. If these saline-alkali land can be utilized and developed, i...

AI Technical Summary

Problems solved by technology

The most widely used humic acid in agriculture is mineral humic acid extracted from low-rank coal, but humic acid in low-rank coal is insoluble in water, so direct application of low-rank coal will not have a significant effect on current crops. There are currently two ways to convert humic acid in low-rank coal into water-soluble humic acid: one is to react with alkali and insoluble humic acid, and the produced humic acid is water-soluble humic acid, but this method gets Humic acid is a macromolecular humate with poor stability and is easy to flocculate under acidic conditions and hard water conditions

The second is to extract water-soluble humic acid by first alkali extraction and then oxidation, and the prepared water-soluble humic acid has strong acid resistance and hard water resistance, but the steps of this method are relatively complicated, requiring alkali extraction, oxidation, separation, etc. steps, industrialization is more difficult

[0004] Chinese patent document CN1188095A discloses a coal-based acid derivative micro-fertilizer and its preparation method, which uses one of low-rank coal peat, lignite, and weathered coal to degrade through deep processing, acid hydrophilization, anti-hardening treatment, and then add N , P, K macroelement nutrients and Mn, Fe, B, Zn, Mo trace elements to produce products. This method uses nitric acid to oxidize low-rank coal into water-soluble humic acid. The steps are cumbersome, and nitric acid will affect low-rank coal The problem of peroxidation occurs, and the nitrogen dioxide produced during the nitric acid oxidation process will cause serious environmental pollution, so this method is difficult to apply in industrialization

This method uses powdery material ultrasonic cavitation reaction method to convert humic acid in low-rank coal into soluble humic acid. The equipment is complicated, the investment is high, the cost is high, and the noise pollution is serious.

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