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The Influence of Liming on Several Properties of Soil Potassium in a Loam Podozl¹

ABSTRACT

Both immediate and long-term effects of liming on some soil K properties were determined. Experimental conditions closely simulated field environment but the complicating factor of differential plant removal was avoided. The soil (pH 4.5) was treated with 0, 0.8, 1.6, 3.2, 4.8 and 8 ton per acre of hydrated lime and sampled at intervals during a 6-year period.

Total K, which was high (1.42%) in relation to exchangeable K (66 ppm.), did not change after liming. Exchangeable K was significantly reduced by nearly the same extent (17%) with all liming rates above 0.8 ton per acre.

Potassium released by a water-equilibration procedure was influenced by liming, the response pattern being greatly affected by time and rate of lime. The heavier treatments effected first an increase in equilibrated K values, then a progressive decrease over succeeding years to a 50% depression at the end of the experiment. With the lighter rates (0.8 and 1.6 ton per acre) substantial depressions occurred initially, becoming progressively greater with time.

Water-equilibrated K was shown to be closely related to plant content (total %), in a short-term plant growth experiment.

¹ Contribution No. 1062 from the Research Station, Canada Dept. of Agr., Kentville, Nova Scotia. Presented before Div. IV, Soil Science Society of America, Chicago, Ill., Dec. 8, 1960.

² Plant Nutritionist and Soil Scientist, Canada Dept. of Agriculture. The former is now at the Research Station, Charlottetown, Prince Edward Island.

Received for publication January 27, 1961. Accepted for publication May 1, 1961.