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Spatial Dependence of Soil Sodicity and Tree Growth in a Natric Haplustalf
Author(s) -
Samra J. S.,
Gill H. S.,
Richter J.,
Anlauf R.
Publication year - 1990
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1990.03615995005400050005x
Subject(s) - dalbergia sissoo , spatial variability , soil science , mathematics , soil water , sodium adsorption ratio , spatial dependence , biomass (ecology) , environmental science , agronomy , statistics , biology , drip irrigation , irrigation
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.