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Spatial Dependence of Soil Sodicity and Tree Growth in a Natric Haplustalf

Central Soil and Water Conservation Research and Training Inst., Research Centre, Sector 27-A, Madhya Marg Chandigarh-160019, India

H. S. Gill

Central Soil Salinity Research Inst., Karnal-132 001, India

J. Richter and R. Anlauf

Institüt für Bodenkunde, Herrenhäuser Str. 2, D-3000, Hannover 21, Federal Republic of Germany

*Corresponding author.

ABSTRACT

A precise knowledge of the spatial variability of salt-affected soils is a prerequisite to optimizing their land use and maximizing biomass production. This study was conducted to investigate inherent variation in pH, sodium adsorption ratio, P, and K of a Typic Natric Haplustalf, growth of Shisham (Dalbergia sissoo Roxb. ex DC.), and their interdependencies. Root-zone soil was sampled on a 6 by 6 m grid at 162 locations (18 rows by 9 columns) of a field at 0.3-m depth increments up to 1.2 m, and analyzed. Depending on the depth and soil properties, trend variation ranged from 14 to 47% (overall average of 27%) of the total variance. Corresponding component of the tree-height heterogeneity varied from 16 to 20% during the four observation years. Ten to 74% of the remaining soil variability, depending on soil layer and properties, was isotropically spatially structured. Thus, on an average, about 30% of the total soil variability was structured. Similarly, the structural component of tree-height variation ranged from 35 to 46% of the sill during 4 yr. Therefore, 33% (average of 4 yr) of the tree-height variance was structured. Spatial correlations of soil properties with tree growth were elaborated through cross semivariograms. Spatially sensitive statistical procedures for the assessment of land qualities, technologies, and soil-plant relationships are recommended.

Received for publication April 28, 1989.