Sampling Volume Effects on Determining Salt in a Soil Profile1
- H. M. Hassan,
- A. W. Warrick and
- A. Amoozegar-Fard2
The effects of soil sampling volume for determining salt present were investigated in situ. Six 2.2-m2 plots were hand sprinkled over a 5-d period with a total of 10 cm of water containing 1000 mg/L of chloride as CaCl2. Soil samples were taken at three locations within each plot at 10-cm increments to 100 cm and at 20-cm increments to the 160-cm depth. Two different samplers, 7.9- and 2.1-cm diameter, were used. The salt concentration was measured on a 2:1 extract. The measurements for the larger samples were less variable than the smaller samples. The coefficient of variability (CV) for the total chloride recovered was 8 and 14% for the large and small samples, respectively. In order to compare favorably to the known amount added, the effective radius of the sampling tool was critical. The CV for the chloride concentration calculated in the soil water ranged from 5 to 54% and 12 to 199% for large and small samples by depth.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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