2. Yields of sterile and fertile hybrids.

Cytoplasmic sterility has no detrimental effect on yield of grain. In 1950 this was corapared in 12 hybrid combinations made on sterile and fertile single crosses and grown in a replicated yield test. The sterile crosses averaged 154 bushels and the fertile 145 in grain yields. The range in average yield of the steriles was 109 to 196 bushels compared with a range of 89 to 167 for the fertiles. The difference of 9 bushels in the averages is not significant, but is suggestive that the steriles might have a somewhat higher yielding ability. A regional test of three hybrids, comparing steriles and fertiles, in five locations showed two of the pairs higher in yield for the sterile.

D. F. Jones