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Limestone, Dolomite, and Calcium Silicate Slag for White Clover Pastures on Red and Yellow Soils¹

ABSTRACT

An experiment has been conducted on five red and yellow podzolic soils since 1949 to study the effects of three kinds and four levels of lime on white clover seed and forage yields. The exchangeable calcium in the soil and soil pH as well as percentage of protein and calcium in the clover forage were used as measures of treatment effect. Other experiments were carried on to determine the availability of phosphorus in calcium silicate slag as measured by white clover forage yields. The design of the experiment was a split plot in which the whole plots were three kinds of lime, viz. calcium silicate, calcitic and dolomitic limestone, and the sub plots were rates of lime, viz. none, 1,000, 2,500, 4,000, and 6,000 pounds per acre. Lime applied at 1,000, 2,500, and 4,000 pounds per acre progressively increased clover forage and seed yields on Prentiss f.s.l., Bowie f.s.l., and Stough v.f.s.l. over a 3-year period. On Loring and Richland silt loams, rates of lime up to 6,000 pounds per acre produced progressive increases in forage and seed production. Lime added at 1,000 to 4,000 pounds per acre produced an annual increase of protein in the clover forage from 36 to 190 pounds per acre. The calcium in the plant material was also increased by additional increments of lime. There was a progressive increase in soil pH and exchangeable calcium at all locations as the rates of lime increased. There was little difference among the three liming materials for increasing the pH and base content of the soil. Likewise, there was little difference among the three liming materials for increasing the forage and seed yields. Mean forage yields at all experimental sites showed a similar response to phosphorus contained in 4,000 pounds calcium silicate slag as to the phosphorus in 250 pounds of superphosphate applied with 4,000 pounds of calcitic limestone. The calcium silicate contained 1.3% P₂O₅.

¹ Contribution from Mississippi State College Agronomy Department.

² Agronomist, Mathieson Chemical Corp., formerly Associate Agronomist, Mississippi Agr. Exp. Sta.; and Research Assistant, respectively.

Received for publication November 27, 1953.