Division of Soil Science and Agricultural Chemistry, Indian Agricultural Research Institute, New Delhi
*Present address: Deputy Commissioner (Soil Conservation), Department of Agriculture, Ministry of Agriculture and Irrigation, Krishi Bhavan, New Delhi
Data on seven soil characteristics for 10 soil profiles belonging to the same soil series were statistically processed to characterise their profile trends along depth. Trend equations were employed and suitability of each equation was judged on the basis of adequacy test and significance of t-values for partial regression coefficients and that of F-values for multiple correlation coefficients. Variation in character values due to different locations of soil profiles was tested by analysis of variance technique.
The study enabled to see the magnitude of changes of declining and increasing values and also the differences in predicted and real values. There were specific profile trends for percentages of sand, silt, clay, organic carbon and iron oxide, while values for per cent CaCO3 and pH, were too much scattered and no specific profile trend could be established in most of the character values, there were no significant differences due to location and thus homogeneity of the soil series as well as field sampling was confirmed.
Profile trends, statistical characterisation
