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Fluid Journal : Fluid Journal 1999-2001
2 Fluid Journal Fall 2000 Mg sourc s M ces Mg sources Mg sources Mg sources Fertilizer magnesium sources are not all that common. The most common is K- Mag (potassium-magnesium sulfate) containing 20-22% K20, 10-11% Mg, and 2 1-22% S. It is available in several grades, including a new readily available and highly soluble, less abrasive premium grade. Diamond K of Richfield, Utah has developed a system for delivery of fluidized K-Mag through sprinkler or drip irrigation systems. Another fluid source is magnesium chloride, containing 7.4% Table 1. Quality, profit, and yield response of Russett Burbank potatoes to magnesium applications in the Columbia Basin, Hoyum, 1989-1997. Mg rate, lb/A Value, $/ton 0-2.5 20 + Quality Specific gravity 1.0784 1.0824 5 %>6oz. 57.16 62.15 3 %US #1s 51.59 70.55 5 % internal discoloration (IBS) 2.39 1.76 - % hollow heart brown center 1.73 1.57 - Total premium/ton on usable tons $13 Yield Tons/A 31.43 33.20 % usables 80.46 85.35 Usable tons/A 25.29 28.34 Increase in usable tons/A = 3.05 Profits 3.05 ton/A usable potato increase x $90/ton base = $274.50/A increase Premium/A ($13 x 28.34 tons/A) = $368.42/A increase Cost of Mg application/A = ($38.85) Net $ increase/A = $604.07 magnesium and 22.7% chloride. It is compatible with UAN and ammonium thiosulfate when mixed with UAN first. It is not compatible with any solution containing phosphorus. Dr Hoyum is vice president of marketing at IMC Global. U
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