Performance of 2-dwarf and 3-dwarf Grain Sorghum Hybrids Harvested at Various Moisture Contents
1973
Windscheffel, Jan A. | Vanderlip, R. L. | Casady, A. J.
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.
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