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ABSTRACT
Concentration of soil solution Al in mineral soils was related to the percent Al saturation of the effective CEC. In organic soils, however, the concentration of Al in the soil solution was more related to the amount of exchangeable Al than to percent Al saturation. Soils with increasing organic matter content had a lower content of soil solution Al at a given pH.
Liming increased the growth of corn on mineral soils when the Al saturation was greater than 70%. On all soils except one, corn responded to liming when the concentration of soil solution Al was greater than 0.40 meq/liter. Soybeans responded to liming on mineral soils when the Al saturation was greater than 30%. On all soils soybeans responded to liming when the concentration of soil solution Al was greater than 0.20 meq/liter.
1 Contribution from the Dept. of Soil Science, North Carolina State Univ. Agr. Exp. Sta. Published with the approval of the Director as paper no. 3105 of the Journal Series. Taken in part from the Ph.D dissertation of the senior author. Presented before Div. S-4, Soil Science Society of America, Nov. 11, 1968, at New Orleans, La.
2 Former graduate assistant and now, Assistant Professor of Soils, Auburn Univ. and Professor of Soil Science, North Carolina State Univ.
Received for publication February 16, 1970. Accepted for publication August 20, 1970.
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