Kayastha, Baban P., authorTerwilliger, Charles, Jr., advisorEverson, A. C., 1920, committee memberJohnson, Donald D., committee member2021-12-072021-12-071965https://hdl.handle.net/10217/234090Covers not scanned.Print version deaccessioned 2021.Ponderosa pine, one of the most valuable species In the Montane zone of northern Colorado, needs to be studied as to its relationships with soil factors. This study, dealing with soil and growth relationships in ponderosa pine, is a basis for evolving methods which will eventually lead to site quality classification. Nineteen plots were selected in the study area. Three pine trees were measured and soils were described on each plot. Soil samples collected from each horizon were analyzed for partical size distribution in the laboratory. Soil and tree data were analyzed statistically in three steps. In the first step a correlation analysis was made using two dependent and five independent variables. Dependent variables were five-year growth index and total height index and independent variables consisted of various methods of expressing depth and texture factors. In the second step the dependent variable used was five-year growth index and independent variables consisted of new methods of expressing depth and texture factors. In the third step a multiple regression analysis was made using the best depth and the best texture factor selected from the first and second step and five-year growth index. Five-year growth index was a better measure of potential growth index than total height index. All methods of expressing depth of A horizon were significant. Methods of expressing depth to C were not significant. All methods of expressing texture as percentage were significant. Effective depth of A horizon and percent silt plus clay to the G horizon accounted for 36 percent of total variability in growth of Ponderosa pine.masters thesesengCopyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright.Yellow pinesGrowth (Plants)SoilsText