Agronomic Response of Three Height Classes of Spring Wheat, Triticum aestivum L., Compared at Different Yield Levels1
- F. H. McNeal,
- M. A. Berg,
- V. R. Stewart and
- D. E. Baldridge2
‘Centana’ (Cnt) plus short, medium, and tall selections of Norm 10/Brevor, 14//6*Centana were grown in yield nurseries at 22 Montana locations in 1969 and 17 locations in 1970. The study was designed to determine the magnitude of the genotype by environment interactions of the three height classes when grown under Montana conditions. Such information is needed to help define the limitations, if any, of semidwarf spring wheats. Agronomic data from each location are reported within one of six yield levels, each level separated by 673 kg/ha (10 bu/acre), with the location average yield determining the yield level assigned.
Medium Cnt had the highest grain yield at all yield levels, except at one location which yielded less than 1352 kg/ha (20 bu/acre). Short Cnt was consistently lowest of the four entries in grain yield and test weight. Short Cnt increased only 29.3% in plant height from the second to sixth yield level, whereas other varieties increased more than 48%. The grain:straw ratio was highest for short Cnt and lowest for Centana and tall Cnt.
The data suggest that breeding efforts for Montana spring wheat should emphasize the development of single gene dwarfs (semidwarfs), and that 2-gene dwarfs (short selectious) generally should be avoided.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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