Soil Water and Nitrogen Influence on Growth and Fruiting of a Cytoplasmic Male-Sterile Corn Hybrid and Its Fertile Counterpart
1966
Bruce, R. R. | Sanford, J. O. | Myhre, D. L.
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.
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