Variations of moisture retention properties and bulk densities of soils between and within soil-mapping units in central Oregon Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/0v8383174

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  • The objective of this study was to estimate the bulk densities and points on the moisture-tension curves and to determine their associated variances for some of the selected mapping units in Central Oregon. These variances will produce informations concerning the precision of the mean and the optimum sampling schemes, for other similar soils. Disturbed and undisturbed samples taken from random locations have been analyzed separately for the 0.1-, 0.5-, 1.0-, 5-, 10- and 15-bar moisture percentages and bulk density for the two depths. From the bulk-density values, 0.1- and 15-bar percentages, the amount of moisture held between 0.1 and 15 bars was calculated. Variances among and within locations in a particular mapping unit were calculated also. According to the data which were obtained, it appears that Deschutes and Redmond soils practically, are very similar in their bulk density and moisture retention properties. Therefore, due to these similarities, it would be expected that the irrigation scheduling would be about the same for a specific crop. The variances among and within locations were of the same order of magnitude. Using these variances it was calculated that the optimum number of sites per location for bulk density and 15-bar percentage was 2, as used in this study. The limits about the mean for a mapping unit which would include different percentages of randomly selected locations within a mapping unit are presented in this thesis. It could be noticed that the mean for the mapping unit may be a rough estimate for a given location; therefore, the number of samples required to estimate the true mean of a location, within different percentages and 5 percent significance level are presented also.
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