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Relation of Soil Potassium and Magnesium to Magnesium Nutrition of Citrus¹

ABSTRACT

Soil and leaf analyses were made in connection with six field experiments involving orange trees fertilized with potassium and/or magnesium. Experimental plots were located in 6 orchards in 4 southern California counties.

The concentration of magnesium in spring-cycle leaves was correlated with the degree of leaf symptoms characteristic of magnesium deficiency. Addition of magnesium fertilizer resulted in a marked increase in leaf magnesium and a disappearance of deficiency symptoms. Potassium fertilization accentuated magnesium deficiency. Deficiency symptoms were associated with leaf magnesium concentrations of 0.20% or less. The ratio of exchangeable K/Mg in the soil (particularly the 18- to 30-inch depth) was highly correlated with the percent magnesium in the leaves.

¹ Paper No. 921. Department of Soils and Plant Nutrition, University of California Citrus Experiment Station, Riverside, Calif. Paper presented before Div. IV., Soil Science Society of America, Davis, Calif., Aug. 16, 1955. This work was supported in part by a grant from the American Potash Institute.

² Senior Laboratory Technician, Assistant Chemist, and Chemist, respectively, in the Experiment Station.

Received for publication September 16, 1955. Accepted for publication January 3, 1956.