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Fluid Journal : Spring 2016
16 The Fluid Journal Spring 2016 The Fluid Journal • Official Journal of the Fluid Fertilizer Foundation • Spring 2016 • Vol. 24, No. 2, Issue #92 Carl Bruice Summary: Due to economic response considerations, urea-sulfuric acid (USA) fertilizers should be used only for immediate response as a band application and only comprise a small portion of the total amendment needed. More economical sources, such as elemental sulfur and/or gypsum, should be selected for broadcast applications to provide the majority of sodium remediation activity. True fluid calcium and acid containing fertilizers offer use flexibility, convenience and near-immediate results when used properly. Avariety of specialty fluid fertilizers are currently available on the market today that not only provide essential plant nutrients but play dual roles as water and/or soil amendments. They represent two unique product groups: fluid fertilizers containing calcium and fluid fertilizers containing acids. Though all fertilizers that contain either urea or ammoniacal nitrogen have a net acidic soil reaction, for the sake of this discussion, only the acid fertilizer will be presented. Their role Fluid calcium fertilizers can be an effective tool to remedy soils that seal from being irrigated with water that is too pure (very low dissolved salts) and as an aid to bulk soil amendments such as gypsum in mitigating high sodium content in agricultural soils or irrigation water. Agricultural land supplied with irrigation water originating from melting snow-pack, results in soils frequently forming structural crusts that impede water filtration. This is a chronic Fluid Fertilizers As Soil And Water Amendments ▼ DOWNLOAD problem on the east side of California’s San Joaquin Valley. As very low salinity water passes through the soil, calcium ions are stripped from cation exchange sites. Reduced soil calcium diminishes A variety of specialty fluid fertilizers are currently available. Table 1. Infiltration rate as influenced by various physical and chemical treatments (Lindcove, 1986) Treatments Avg. Infiltration Rate (inches/hour) Calcium nitrate, undisturbed 0.18 a Gypsum, disturbed 0.17 a Gypsum, undisturbed 0.15 ab Polyacrylamide, disturbed 0.11 bc Polyacrylamide, undisturbed 0.11 bc Control, disturbed 0.10 bcd Control, undisturbed 0.09 cd Non-ionic surfactant, disturbed 0.08 cd Non-ionic surfactant, undisturbed 0.06 d LSD .05 0.05 Numbers followed by the same letter are not significantly different (P = 0.05)