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Responses of Some Semi-Dwarf Spring Wheats to Nitrogen and Phosphorus Fertilizer¹

A breeding program that utilized semi-dwarfs of Norin 10 origin, was commenced at Logan, Utah, in 1953. The ultimate aim was the production of a short, high-yielding, disease-resistant, good milling, hard red spring wheat.

Yields of three varieties of hard red spring, semidwarf wheat increased proportionately more than those of three tall, hard red springwheats as a result of applying nitrogen early in the growing season. During a 4-year study, yield, height, lodging, percent protein, and sedmimentation values were all increased, except in very fertile soil, by the addition of nitrogen. Yield increases were primarily due to the production of more tillers. No increases were evident in the number of kernels per spikelet, per head, or in kernel weight. Added phosphorus gave no significant increase in any measured character. Net dollar returns from semi-dwarfs were nearly double those from tall, hard red spring wheats when both were fertilized with nitrogen.

² Research Agronomist U. S. Department of Agriculture. (Appreciation is expressed for the assistance given by L. P. Reitz during the planning and execution of this experiment.)

Received for publication May 24, 1965.