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Humic acid is traditional chemical NPK fertilizer promoters

November 15, 2022

Humic acid is traditional chemical NPK fertilizer promoters. Humic acid can promote the absorption of NPK in crops, which can not only reduce costs but also improve soil

1. Synergistic effect on nitrogen fertilizer

Nitrogen fertilizers are mostly urea, and ammonium nitrogen is unstable and volatile. After mixing with humic acid fertilizer, because humic acid contains functional groups such as carboxyl and phenolic carboxyl groups, it has strong ion exchange capacity and adsorption capacity, which can reduce the loss of ammonium nitrogen. Urea is an amide nitrogen fertilizer, and the nitrogen contained in it needs to be decomposed and converted into ammonium carbonate by the urease secreted by urea bacteria before it can be absorbed by plants. If urea is applied to the calcareous soil, the ammonium bicarbonate produced by the decomposition of urea will also cause volatilization loss due to alkalinity, which is one of the reasons why the nitrogen utilization rate of urea fertilizer is not high. Adding humic acid to urea has obvious synergistic effect on urea. First, the activity of urease is inhibited to slow down the decomposition of urea and reduce volatilization; second, humic acid can form a complex with urea, gradually decompose and release nitrogen, prolong the fertilizer effect of urea, and at the same time, the biological activity of humic acid can promote the root system of plants Development and nitrogen metabolism in the body, promoting nitrogen absorption.

Humic acid is traditional chemical NPK fertilizer promoters

2. Synergistic effect on phosphate fertilizer

When fast-acting phosphorus fertilizers are applied to the soil, soluble phosphorus is easily fixed by the soil. In acidic soil, phosphorus is mainly fixed by free iron and aluminum ions; in calcareous soil, phosphorus is mainly fixed by calcium, resulting in the conversion of available phosphorus into delayed phosphorus or even ineffective phosphorus, and the utilization rate of phosphorus in the current season is only 10-20% . After adding humic acid fertilizers, it can restrain the fixation of water-soluble phosphorus in the soil, slow down the transformation of fast-acting phosphorus to late-acting and ineffective states, and humic acid can also increase the moving distance of phosphorus in the soil and promote the absorption of phosphorus by the root system.

3. Synergistic effect on potassium fertilizer

Humic acid contains functional groups that can absorb and store potassium ions, which can not only prevent its loss with water in sandy soil and leaching soil, but also prevent the fixation of potassium in cohesive soil. Some parts of humic acid are small-molecule humic acids such as fulvic acid, which have a dissolution effect on minerals such as potassium silicate and potassium feldspar, which can slowly decompose them, increase the release of potassium, and increase the content of available potassium.