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The paper reports the subsequent impact of herbicides on seed production, a key factor affecting persistence of annual legume species... Seed yield was assessed by collecting all pods/burrs and free seed from the soil surface within one 0.2 m 2quadrat per plot using a vacuum harvester... Other factors to consider include (a) general adaptation of each species/line to the shallow duplex soil and 350mm rainfall zone as this will influence potential seed yield, and (b) secondary effects of herbicide use; for instance, a legume will generally benefit from reduced weed competition if it is tolerant of the herbicide used to kill/suppress the weeds...
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