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The Effect of HPAN and IBMA on the Fixation and Availability of Potassium in Several Ohio Soils¹

ABSTRACT

Solutions of K salts with and without conditioner were added to four soils in sufficient solution to bring the soils approximately to field capacity. The conditioners were HPAN (hydrolized polyacrylonitrile) and IBMA (isobutylene maleic acid). The treated soils were incubated for several days, oven-dried at 68°C., and K fixation against extraction with NH₄OAc was determined. The results indicated that K fixation was reduced by the conditioner treatments.

In a pot experiment, using corn and Sudangrass as assay plants, K was added at 2 levels with and without conditioner on 2 Ohio soils. High levels of N and P were added to all pots so that they would not be limiting factors. The yield and K content of corn and Sudangrass were greater on pots treated with conditioner and K than on pots treated with either alone. Possible explanations for the reduction in K fixation and greater availability of K resultant from treatment with conditioners are presented.

¹ Contribution from the Department of Agronomy, Ohio State University and Ohio Agr. Exp. Sta. Published by permission of the Director as Journal Article No. 56–55. Presented before Div. IV, Soil Science Society of America, Aug. 16, 1955, Davis, Calif.

² Research Assistant at Ohio State University and Ohio Agr. Exp. Sta., Assistant Chemist at California Citrus Exp. Sta., and Chairman, Department of Soil Science, University of Minnesota, respectively.

³ HPAN and IBMA conditioners and financial support were given for this study by the Monsanto Chemical Company.

Received for publication October 31, 1955. Accepted for publication May 31, 1956.