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Soil Water and Nitrogen Influence on Growth and Fruiting of a Cytoplasmic Male-Sterile Corn Hybrid and Its Fertile Counterpart¹

The grain yield and several yield components of a cytoplasmic, male-sterile, single cross, corn hybrid and its fertile counterpart were measured in relation to imposed soil water tension regimes and applied nitrogen levels. The male-sterile strain consistently yielded more grain than its fertile counterpart, primarily because of the greater number of second ears produced. A maximum soil water tension of nearly 6 bars, imposed during the fruiting period, significantly accentuated the observed difference in ear production. At the 6-bar maximum soil water tension imposed during fruiting, the ear length and diameter of male-sterile corn were significantly greater than those of the male-fertile; however, at the 0.3 bar maximum soil water tension imposed during fruiting, ear dimensions of the two strains were similar. Although the sterile strain consistently produced a greater number of ears under all conditions of these experiments, reduced levels of nitrogen and soil water more seriously affected ear diameter and length of the fertile strain.

² Associate Agronomist, Mississippi Agricultural Experiment Station, (presently Research Soil Scientist, Southern Peidmont Conservation Research Center, Watkinsville Georgia) and Research Soil Scientists, Soil and Water Conservation Research Division, ARS, USDA, State College, Mississippi, respectively

Received for publication May 31, 1966.

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