Date of this Version
Thesis (M.S.)--University of Nebraska--Lincoln, 1953. Department of Agronomy.
A series of crop rotations experiments were initiated in 1912 and continued until 1951 at the Scotts Bluff Field Station in Nebraska. The purpose of these rotation experiments was to compare the influence on crop yields resulting from the various cropping and manorial systems. The influence of the various systems was determined by comparing: (i) crop yields of 2-, 3-, 4-, and 6-year rotations with those of continuous cropping, (ii) crop yields from rotations which included alfalfa with those from similar rotations without alfalfa, and (iii) crop yields from rotations which included applications of manure with those from similar rotations without manure.
Soil moisture is an important factor in the production of plants. Water infiltration rates were determined on all plots. The data obtained for the infiltration of water into the soil suggests that an optimum level of organic matter, supplied as manure, may exist for maximum water infiltration. From the results obtained on these experimental plots a beneficial effect from alfalfa on the infiltration of water into the soil did not occur until the alfalfa had been growing for two years.
Advisor: Andrew P. Mazurak.