Abstract
Three organic acid compounds were evaluated for preventing precipitation of salts and/or removing salts indrip irrigation systems and soils. Three experiments were conducted to measure drip emitter clogging, ponded infiltrationand soil salinity change. All acid compounds included maleic acid, a form of dicarboxylic acid. The first organic acid wascomposed of polymaleic acid, maleic acid, surfactant blend, and inert ingredients. The second was an anionic polymerwith maleic acid as the organic acid. The third included a soap and was a 1:1 stoichiometric equivalent of an organiccarboxylic acid and an amine base. The first and third organic acid significantly reduced drip emitter clogging comparedto a water-only treatment. The third organic acid was significantly better than the first for reducing clogging. The thirdorganic acid and water-only treatments significantly reduced soil sodicity below the drip irrigation laterals during thestudy. Ponded infiltration tests with organic acid in water were also conducted. All three organic acid treatments producedsignificantly lower infiltration rates than the water-only treatment. This may have occurred because salt precipitates inthe soil were removed and pores were clogged.
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