Organic Acids And Why You Should Be Using Them

By Tom Sharp

Over time, a substantial amount of curiosity has been triggered in organic acids and their use in agriculture. Organic acids are produced from ancient deposits of organic substance that have decomposed for many generations. This material is decomposed a good deal more than the humus that is so preferred in the soil.

This type of soil is a rich brown to black and often originates in close proximity to coal deposits in the earth's crust and begins as peat, brown coal, soil, or leonardite. it is a tremendously big and complex molecule, at the molecular level, without any identifiable structure. Organic acids can be simplified into three different parts: humic, humin and fulvic.

Humic acid is the most frequently obtainable form of organic acid and is full of humic, fulvic and humin fractions. This is typically an unrefined product that has been mined, crushed and separated for proper dimension. The name humic "acid" is in fact a misnomer since it contains a pH of 11 or higher. gardening specialists will speak of humic acid as "humate". It is manufactured in a dry granular type as well as in the form of a liquid. Dry humic can compliment most dry fertilizer blends by mixing at a rate of 20 - 40 pounds per acre.

When blended with dry phosphate fertilizer, humic attracts microbes to the prills and enhances degradation of the waxy protective coating. This speeds up the rate at which the nutrients become available for plant use. Humic also acts like a chelating agent to protect phosphate from being tied up in the soil. This happens because humic has an enormous number of binding sites where nutrients can attach themselves and are protected until needed by a plant.

Liquid humic is commonly added to liquid nitrogen (UAN 32) or to liquid phosphate (10-34-0). UAN 32 is a very popular fertilizer used to top-dress winter wheat in northern Utah and Southern Idaho. The addition of humic to the fertilizer will minimize burning of the leaves and reduce the amount of nitrogen that can volatilize. It is not uncommon to use over 80 available units of nitrogen with the addition of humic on irrigated winter wheat. This is normally done as early as possible in the spring and usually in conjunction with an herbicide application using a ground rig.

Fulvic acid is beyond doubt acidic, containing a pH below 7 and is fairly easy to extort from the raw humic. It is generally a transparent to amber colored liquid and the actual fulvic ratio can differ between manufacturers. Quite a few herbicides and foliar nutrients act in response to the addition of fulvic to the spray tank. Fulvic, in general, is extremely active in the plant and the soil but is only a small proportion of the general humic.

Humins are the most difficult to extract but are the most stable in the soil and provide more direct plant activity than fulvic. Since they are so difficult to extract, the best way to apply humin to the soil is by using the full humic acid in its raw form.

Organic acids affect the soil by elevating the H2O holding capacity, gathering stable organic matter to the soil, and increasing the nutrient holding capacity. When mixed directly to the nutrients being applied, organic acids intensify effectiveness and are eco-friendly. A detailed study completed by the University of Idaho, proposes that organic acids offer an economic return to growers in virtually every trial. - 32395

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