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Growth and Chemical Composition of Crownvetch as Affected by Lime, Boron, Soil Source, and Temperature Regime¹

Crownvetch (Coronilla varia L.) was grown in environmental chambers at three temperature regimes using lime and boron applications separately and in combination on Gilpin shaly silt loam soil from north and south exposures. Temperature regimes were (TI) 18.3 C day — 12.8 C night; (T2) 23.9 C day — 18.3 C night; and (T3) 29.4 C day — 23.9 C night. Liming increased both root and top growth in all instances There was a significant plant growth response to temperature regime, soil from different exposures, lime, and temperature x lime interaction. Application of boron increased yields of plants grown on soil from the northern exposure but not on soil from the southern exposure. Application of boron, with or without lime, increased boron content of crownvetch, but lime applications reduced the amount of uptake. The T2 temperature regime was optimum for top growth but T1 was optimum for root growth. Soil pH ranged from 4 to 5.6 by the end of the study; growth of crownvetch did not appear to be impaired at these low pH values when lime had been applied.

Liming increased Ca but reduced P, K, Mg, Mn, Zn, B, Na, and Cu concentrations of plants. Application of boron to soil increased B and Fe concentrations of plants, especially at T2 and T3. Phosphorus concentration of plants was higher at T2 and T3 than at T1; however, Fe, Al, and Mg concentrations generally decreased with increasing temperature.

Key Words: Slope • Exposure • Aspect

² Research Investigations Leader and Agronomists, ARS, USDA, Morgantown, W. Va., respectively.

Received for publication August 17, 1972.