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Publication Date
1977
Description
A cultivar of the cool-season grass species smooth bromegrass (Bromus inermis Leyss.), designed to be more efficient in water use for summer pasture, was selected from a source nursery of 37,000 plants grown under near optimum moisture and fertility. From this nursery 69 genotypes superior for regrowth were placed in the greenhouse and tested for regrowth, net carbon dioxide exchange (NCE) rates, and other characteristics relevant to regrowth. On the basis of performance 32 genotypes were selected and vegetatively reproduced for inclusion in a field test, again under optimum conditions of moisture and fertility. Two harvests were made in the season of establishment and four in the following season. A correlation of 0.94** was obtained between regrowth (as measured by yield) and water use efficiency, but low correlation with NCE was found. Genotypes showing superior water use efficiency as well as acceptable agronomic characteristics were. included in a synthetic cultivar, 'SD 5'. In a comparative test under irrigation this cultivar has been superior to 'Lincoln', the standard smooth bromegrass cultivar presently in use in South Dakota, in regrowth and water use efficiency as indicated by total seasonal yields.
Citation
Gross, D F. and Ross, J G., "Improving water use efficiency of smooth bromegrass by selecting for regrowth" (1977). IGC Proceedings (1977-2023). 29.
(URL: https://uknowledge.uky.edu/igc/1977/sess2/29)
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Improving water use efficiency of smooth bromegrass by selecting for regrowth
A cultivar of the cool-season grass species smooth bromegrass (Bromus inermis Leyss.), designed to be more efficient in water use for summer pasture, was selected from a source nursery of 37,000 plants grown under near optimum moisture and fertility. From this nursery 69 genotypes superior for regrowth were placed in the greenhouse and tested for regrowth, net carbon dioxide exchange (NCE) rates, and other characteristics relevant to regrowth. On the basis of performance 32 genotypes were selected and vegetatively reproduced for inclusion in a field test, again under optimum conditions of moisture and fertility. Two harvests were made in the season of establishment and four in the following season. A correlation of 0.94** was obtained between regrowth (as measured by yield) and water use efficiency, but low correlation with NCE was found. Genotypes showing superior water use efficiency as well as acceptable agronomic characteristics were. included in a synthetic cultivar, 'SD 5'. In a comparative test under irrigation this cultivar has been superior to 'Lincoln', the standard smooth bromegrass cultivar presently in use in South Dakota, in regrowth and water use efficiency as indicated by total seasonal yields.
