Abstract
Data from four solubility studies for liquid fertilizer solutions containing three or more plant nutrients are presented on equilateral triangles. Isoconcentration contour lines indicate the maximum solubility of the nutrients as the sum of the plant food components, i.e., total plant nutrient = %N + %P2O5 + %K2O.
One study was based on an ammoniated phosphoric acid (80% polyphosphate level)-urea-potassium chloride-water system. The base solution was a nominal 11-37-0 grade, with one-fifth of the total phosphate derived from wet-process phosphoric acid and the remainder from electric-furnace acid. Two of the studies were with nonchloride sources of potash, and the fourth study was with ammonium sulfate as a source of sulfur and supplemental nitrogen.
All solubility data were measured at 0°C. However, estimates of solubility at other temperatures can be made by proper use of temperature-solubility factors. Also given are areas on the figures indicating precipitating salts, as determined by petrographic examinations.
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Shaffer, H.B. Solubility studies in multicomponent fertilizer solutions. Fertilizer Research 15, 89–99 (1988). https://doi.org/10.1007/BF01049190
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DOI: https://doi.org/10.1007/BF01049190