Soil Studies in Sal forests of Dehra Dun Division

Abstract

The paper describes the results of a soil investigation carried out in Dehra Dun Forest Division of Uttar Pradesh during 1956 amd 1957. It has been observed that both fine and coarse-textured soils which are acidic and non-calcareous support good sal growth provided the conditions of moisture supply, aeration and drainage are satisfactory. The soil conditions favourable for advanced sal growth are not necessarily suitable for its adequate natural regeneration. Coarse-textured and excessively bouldery soils with deficient moisture retention as well as those with high accumulation of organic matter in the top layer do not offer congenial medium for the establishment of recruitment. Clayey soils with poor permeability also interfere with the establishment of natural regeneration unless appropriate measures to promote structure and improved seed bed condition are adopted. Calcium status does not appear to be much critical for the reaeneration and advanced growth of sai under the local conditions. Dense root development of the associated flora in the top layer competes strongly for moisture and nutrients and is detrimental to regeneration. Apart from biotic influences and frost attack the dense overhead canopy and undergrowth are other additional factors which adversely affect regeneration.