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Published in Crop Sci 13:215-219 (1973)
© 1973 Crop Science Society of America
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Performance of 2-dwarf and 3-dwarf Grain Sorghum Hybrids Harvested at Various Moisture Contents1

Jan A. Windscheffel, R. L. Vanderlip and A. J. Casady2

Experiments were conducted at three locations in Kansas to see if in producing combine (3-dwarf) varieties the potential grain yield of sorghum [Sorghum bicolor (L.) Moench] had been reduced. Harvesting was done at three moisture contents, and effects on lodging, threshing loss, grain yield, and stover yield were determined. Isogenic (2-dwarf and 3-dwarf) ‘RS 650’ and ‘RS 702’ hybrid grain sorghums differing by one gene (Dw3) were used. The tall, 2-dwarf sorghum was found to yield 12.7% more threshed grain, 11.6% more total grain, and 22.1% more stover than the short, 3-dwarf plants. The 2-dwarf sorghum lodged significantly more than the 3- dwarf in late season wind storms at three of the locations. Harvesting sorghum at about 26% grain moisture yielded 8.4% more total grain and 7.4% more stover than harvesting at 14% grain moisture. Threshing losses were significantly higher when the grain was harvested at high moisture. Threshing losses were significantly lower for the 2-dwarf than for the 3-dwarf grain sorghum.

Key Words: Sorghum bicolor (L.) Moench • High moisture harvest • Lodging • Height

1 Contribution No. 1295, Agronomy Department, Kansas Agricultural Experiment Station, Manhattan, 66506 in cooperation with Agricultural Research Service, USDA. Part of a thesis submitted by the senior author in partial fulfillment of requirements for the M.S. degree.

2 Former Graduate Research Assistant and Associate Agronomist, Agronomy Department, Kansas State University; and Research Agronomist, ARS, USDA, respectively, Manhatttan, Kans. 66506.

Received for publication July 27, 1972.




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