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Thesis (M.S.)—University of Nebraska—Lincoln, 1954. Department of Agronomy.


Copyright 1954, the author. Used by permission.


The object of this study was to determine the effects of calcium sulfamate and sodium sulfanilate on certain agronomic characteristics and on rust development on spring wheat, barley, and oat varieties.

Four spring wheat varieties, Centenario, Mida, Rushmore, and Nugget were planted in a split plot design with varieties as the main plots. Two spring barley varieties, Feebar and Custer, and two oat varieties, Nemaha and Kanota were planted in a separate experiment in a split-split-plot design, with crops as the main plots and varieties as the subplots. In both experiments the treatments consisted of aqueous solutions made with calcium sulfamate and sodium sulfanilate at two concentrations which were applied immediately after pollination, and 4 to 7 days later a second application was made to half of the previously treated plants.

High doses of calcium sulfamate injured the plants by reducing yield, germination, kernel weight, and total weight of the plant (straw and grain). This injury was the most severe on the wheat and oats. The germination of wheat was reduced slightly more than 50 percent, oats by 62 percent, and barleys by 14 percent. The high doses of calcium sulfamate reduced rust infection in all three crops.

Sodium sulfanilate increased the yields and kernel weights in all three crops and the germination of seed was not affected. This chemical gave no control of rust except in the case of Custer barley.

Another experiment was planted with Mida spring wheat and treated at six stages of growth with aqueous solutions of calcium sulfamate and sodium sulfanilate. The stage of growth at which the chemicals must be applied appeared to play an important role in their use. Calcium sulfamate injured the plants when applied at tillering stage, immediately after bloom, and seven or nine days after bloom. When this chemical was applied at bloom and boot stages no injury was apparent, and the yields were higher than that for the check.

Sodium sulfanilate did not injure the plants at any stage or give any rust control. On the other hand the yields and kernel weights were increased considerably when this chemical was applied at one week after bloom which suggests that this chemical although it does not control rust has some stimulative effect.

Advisors: L. P. Reitz and J. E. Livingston