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Soil Reactions at Various Depths as Influenced by Time Since Application, Placement, and Amount of Limestone

ABSTRACT

The results of several experiments show that limestone, either mixed with the plow layer or added to the surface of soils, has reduced appreciably the acidity of lower horizons. At least, in the case of surface applications, the reduction in acidity of the lower layers seems to have been due to continuing disintegration and solubility of the limestone and not to a movement of exchangeable bases to lower levels at the expense of the upper.

The soil tests and the increase in yields of grassland show that surface application is a very efficient method of adding limestone to permanent turfs.

It is estimated that about 300 pounds of limestone per acre annually, will maintain a given pH in the plow layer of similar soils not receiving physiologically acid fertilizers.

The depth and degree to which acidity was reduced in the lower levels of soil were influenced by the amount of limestone and by the lapse of time since its application.

¹ Storrs Agricultural Experiment Station, Storrs, Connecticut.