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Thesis (M.S.)—University of Nebraska—Lincoln, 1944. Department of Agronomy.


Copyright 1944, the author. Used by permission.


In 1912 a series of rotation experiments were initiated at the Scotts Bluff Field Station in the Platte valley of western Nebraska. The rotation experiments were conducted on Tripp very fine sandy loam, a Chestnut soil which occupies nearly level or gently undulating stream terraces. Tripp soils have good surface and internal drainage and are among the most productive irrigated soils in the area. During the course of the investigation a number of reports on crop yields have been published. The results obtained have definitely established the value of legumes and manure for the production of irrigated crops. No data has been published showing the influence of the rotation experiments on the chemical properties of the soil. Accordingly, it was the purpose of this study to compare the influence of different cropping and manuring practices on some chemical properties of Tripp very fine sandy loam after thirty years of experiment.

The chemical properties studied were total nitrogen, oxidizable material, nitrification rate, soluble phosphorus, cation exchange capacity, exchangeable potassium and sodium, pH, and soluble salts.

Advisor: H.F. Rhoades