Synopsis High rates of chloride had little effect on the percentage of other elements in corn leaf tissue in field experiments, whereas total absorption of phosphorus, nitrogen, and magnesium was affected in pot experiments. Stalk rot incidence was decreased with increased potassium chloride applications but not with increased potassium sulfate and potassium metaphosphate applications.

Synopsis High concentrations of chloride attained in row fertilization had adverse effects on corn growth, maturity, and yield. Broadcasting or mixing the chloride with soil tended to alleviate these effects. Low chloride applications, common in hill or row fertilization with KCI, were not detrimental but generally beneficial.

Synopsis Most efficient utilization of potassium by alfalfa and alfalfa‐orchardgrass was obtained when potassium was evenly split and applied in early spring and after the first cutting. Efficiency was reflected by (1) less applied potassium needed for maximum yield, (2) good potassium recovery by the plant, and (3) favorable distribution of potassium in the plant throughout the growing season.

Synopsis Application of 2.5 pounds of Cu per acre corrected the deficiency on both high and low organic matter soils. Applications made at planting on February 15 or March 15 were equally effective where the deficiency was not severe; but on soils with severe deficiency applications after February 15 did not give maximum yields. Three common Cu compounds gave similar results. Cu level in the plant was not affected greatly by the rate but was affected by date of application of Cu and by other micronutrients.

Synopsis Annual application of 200 pounds of N and 83 pounds of K per acre resulted in the highest orchardgrass yields and best recovery of N, P, and K by the plant. The K level in the plant at which yields fell below the maximum was positively related to the rate of N applied.