The growth and miserotoxin content of Columbia milkvetch (Astragalus miser) plants that were clipped in late May were determined at weekly intervals until early July. Groups of Columbia milkvetch plants were collected from 2 sites (near Lac du Bois, 11 km North of Kamloops, British Columbia) at weekly intervals for 7 weeks during May-July, 1984. Six groups of 20 plants were harvested on the first day of the trial (a control group and 5 groups which would be subjected to clipping again). The aerial portion of the plant was excised at the base just above the crown. At weeks 3, 4, 5, 6, and 7 one group of previously clipped plants and a new control group of 20 plants were harvested.
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