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Thesis (M.S.)--University of Nebraska--Lincoln, 1958. Department of Agronomy.


Copyright 1958, the author. Used by permission.


The plots sampled in this study were located at Lincoln, Nebraska, on the Agronomy Farm. Nine of the replications sampled in this study have been established for 19 years and are apparently the oldest continually subtilled and plowed plots in the world. The other four replications were 14 years old. These plots were sampled and the samples analyzed to determine whether subtilling as compared to plowing had produced any differences in readily oxidizable matter, carbon, and nitrogen. The plots were located on a soil classified as Sharpsburg silty clay loam which is typical of many eastern Nebraska soils in fertility and texture. The plots selected were from two rotations, one consisting of corn, oats, and wheat and the other consisting of sweetclover, oats, wheat, and corn. The data were analyzed together so as to better estimate the effects of subtillage over more general conditions than would be possible by confining measurements to one rotation or to one crop. The plots were part of a series established to study the effect of stubble-mulching in relation to erosion, moisture conservation, and crop yield.

Advisor: T. M. McCalla.