The Interaction of Kind of Soil Colloid, Fertility Status, and Seasonal Weather Variation on the Cation Content of Turnip Leaves
1956
Army, T. J. | Miller, E. V.
In a study of the effect of environmental factors on cation content of turnip greens, seasonal weather variations from spring to fall were shown to be of similar importance to soil and fertilizer factors. Divalent cation content of leaves was greater in spring than in fall. Monovalent cation content was significantly higher in the fall than in the spring. The magnitude of the seasonal effects on cation concentration was modified by the type of clay mineral predominating in the soil and by the percentage soil saturation with Ca and Mg. The critical level of divalent cation saturation was higher on montmorillonitic than kaolinitic soil. Evidence was obtained for a sharp increase in divalent ion availability between 66% and 76% divalent base saturation on the montmorillonitic soil. A higher lime level would be required in fall than in spring especially on montmorillonitic soils.
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