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Response of Cotton to Lime on Georgia Soils¹

ABSTRACT

The value of light broadcast applications of ground limestone for cotton fertilized with non-acid forming fertilizer has been pointed out. Soil pH is not a reliable criterion to determine when liming is necessary when the reaction falls in the range studied, pH 5.5 to pH 6.3. However, under more extreme conditions of acidity or alkalinity it is to be expected that pH values could be successfully used for this purpose. Exchangeable calcium appears to be a somewhat more reliable method for determining the lime needs of soils. With soils of low base-exchange capacity such as those studied, a high degree of saturation with calcium representing a pH of 6.5 or above, is needed to supply adequately the needs of cotton for calcium.

¹ Contribution from the Georgia Agricultural Experiment Station, Experiment, Ga. Published with the permission of the Director as Journal Paper No. 182.

² Associate Agronomist.