Relation of Soil Potassium and Magnesium to Magnesium Nutrition of Citrus1
- R. C. McColloch,
- F. T. Bingham and
- D. G. Aldrich2
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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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