Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 23:594-596 (1983)
© 1983 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Quality Traits in Forage Sorghum Harvested at Early Head Emergence and at Physiological Maturity1

J. F. Pedersen, F. A. Haskins and H. J. Gorz2

Information about the extent of variation in quality traits among plants sampled at the same developmental stage but on different dates would be useful to forage researchers. The primary purpose of this study was to obtain such information for five forage sorghum [Sorghum bicolor (L.) Moench] cultivars. Percent dry matter, crude protein, and in vitro dry matter disappearance of leaf, stem, and whole plant samples were determined for field-grown samples harvested on three different days during early head emergence (EHE) and once during physiological maturity (PM) for each cultivar. Orthogonal comparisons between EHE and PM sampling stages and among the EHE samples were made. Results of the 2-year study indicated that statistically significant differences existed among EHE samples and between EHE and PM samples. However, differences among EHE samples were generally much smaller than those between EHE and PM samples and may be of little importance for some applications.

Key Words: Protein • Digestibility • Dry matter • IVDMD • Sorghum bicolor

1 Contribution from the USDA-ARS, and the Dep. of Agronomy, Nebraska Agric. Exp. Stn., Lincoln. Published as Paper No. 6861, Journal Series, Nebraska Agric. Exp. Stn.

2 Former graduate research assistant, Univ. of Nebraska, now assistant professor of agronomy, Auburn Univ.; George Holmes professor of agronomy; and supervisory research geneticist, USDA-ARS, and professor of agronomy, Univ. of Nebraska, Lincoln, NE 68583.

Received for publication April 21, 1982.




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