Op. Agrawal et al., GEOSTATISTICAL ANALYSIS OF SOIL-SALINITY IMPROVEMENT WITH SUBSURFACE DRAINAGE SYSTEM, Transactions of the ASAE, 38(5), 1995, pp. 1427-1433
Spatial variability of soil salinity and hydraulic conductivity at Sam
pla Farm of the Central Soil Salinity Research Institute (CSSRI), Karn
al (Haryana), India was studied using a geostatistical approach. Measu
rements were taken at distances of 50, 150, and 200 m along the X-axis
and at intervals of 12.5 m for the first 300 m and then at intervals
of 25 m from 300 to 375 m along the Y-axis. Variograms and autocorrelo
grams were utilized to identify the degree of dependency of soil salin
ity between pairs of measurements. Cross-semivariograms yielded better
structured spatial variability than semivariograms for all three year
s (1984, 1987, and 1990) of observation. Decreasing soil salinity was
validated by the jack-knifing method. Mapping of soil salinity and hyd
raulic conductivity did show the effect of drain spacing in confirmati
on with varied range of hydraulic conductivity and soil texture in the
region.