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Daily manual agitation of the selling bag during anthesis more than doubled average self-seed set of 162 crested wheatgrass clones in 1966 and more than tripled selling in 1967 and 1968. Increasing the number of spikes per bag from 5 to 10 only slightly decreased the number of seeds per spike. As spikes per bag were increased from 5 to 20, the number of seeds per bag increased 2.2 times; and the number of seeds per spike declined by 45%. Bag agitation was more essential to selfing in bags with 20 spikes than in bags with either 5 or 10 spikes. Daily agitation of bags with 10 spikes is recommended as an efficient method of selling crested wheatgrass
Key Words: Self-fertility Interannual correlation Agropyron desertorum Pollination
2 Research Geneticist, Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture.
Received for publication January 13, 1969.
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