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Fluid Journal : Fluid Journal 1999-2001
2 Fluid Journal Fall 1999 significantly to applied Cl. Varieties showing the greatest sensitivity to Cl deficiencies logically showed the greatest yield responses to applied Cl. Yield responses did vary dramatically among varieties. Cimarron produced an additional 23 bu/A at a Marion County location in 1997, where soil Cl levels were very low at 7 lbs/A-2 ft. Leaf deficiency symptoms were pronounced. Twelve of 16 varieties responded significantly at that location that year. Conversely, where soil test Cl was higher at the Saline County location in 1997 (22 lbs/A-2ft), applied Cl had no effect on yield. Plant Cl concentrations were 0.29 percent. The positive impact of Cl fertilization on wheat grain yield in these studies was apparently nutritional, since leaf disease pressure was low at every site. Return per acre. Increased net return among the varieties in Figure 1 ranged from $4 to $52/A. Average of 16 varieties over both locations was $16/ A, pricing Cl at $0.25/lb and wheat at $3/bu. Chloride levels. Chloride fertilization significantly increased plant Cl concentrations each year for all varieties. Significant differences in plant Cl were noted between varieties both with and without Cl fertilization, suggesting varieties differ in Cl uptake. Lower soil Cl levels produced lowest plant Cl concentrations in all varieties, often less than 0.10 percent. Catching on Data continue to mount showing that Cl is a nutrient that can add wheat yield, cut production costs per bushel and increase profits where a good fertility program is already in place. Winter wheat, spring wheat and barley have responded to Cl fertilization from Texas to the Canadian Prairies and into the Pacific Northwest. Dr. Lamond is professor and Roberson is a graduate student in the Department of Agronomy, Kansas State University Rector is field agronomist for Ag Services, Hillsboro, KS.
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