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Sampling the Unsaturated Zone in Irrigated Field Plots¹

ABSTRACT

Data obtained from samples from each of 10 holes/plot for one plot from each of three soils were subjected to statistical analysis and used to formulate plans for sampling the 1.5- to 4.5-m depth of 48 experimental plots that had received animal manures. The statistical analysis of these three plots suggested that 10 holes/plot and 10 samples/hole would provide plot means within about 20% of the true means for nitrate and chloride concentrations and electrical conductivity of saturation extracts, EC_e, except for one soil which had residual salts in highly variable concentrations at the 3.0- to 4.5-m depth. The sampling procedure developed gave satisfactory results when statistical analysis of the effects of manure treatments, soils and irrigation levels on nitrate, chloride and EC_e were measured.

¹ Contribution from the Dep. of Soil Science and Agric. Eng., Univ. of California, Riverside, CA 92502. The financial support of the USDA through cooperative Agreement no. 12-14-100-10432(41), the National Science Foundation through Grant GI-43664, and of Western Consumers Industries, Inc., through a grant-in-aid, is hereby gratefully acknowledged.

² Professor of Soil Science, Staff Research Associate, and Statistician, respectively, of the Univ. of California, Riverside.

Received for publication September 15, 1975. Accepted for publication December 29, 1975.