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Effect of Placement of Phosphorus and Lime on the Growth of a Ladino Clover-Orchardgrass Sward¹

High exchangeable Al in subsoils has been suspected as a cause of limited persistence of ladino clover on some soils of the Southeast. The effect on a ladino-orchardgrass sward of rather thorough incorporation of P and limestone into one such soil was studied. Mixing was by means of a rototiller, one furrow at a time, and extended as deep as 45 cm, compared with broadcast application, followed by disking to 15 cm. Two levels of each material were used, the soil test suggested level and 3 times the soil test level. Deep incorporation resulted in no detectable benefit with either material, and appeared to reduce residual P. Subsoil Al was sharply reduced by liming, but it appeared that mixing to a depth of 15 cm was adequate for these plants on this soil.

Key Words: Trifolium • Exchangeable Al • Residual P • Banded P

² Professor of Soil Science, North Carolina State University at Raleigh. The author wishes to express appreciation to J. R. Piland and J. W. Gilliam for the plant analyses; to the staff of the Soil Testing Laboratory, North Carolina Department of Agriculture for the soil analyses; and to D. D. Mason and L. A. Nelson for the statistical treatment of the data.

Received for publication September 6, 1969.