include, among other factors, nutritive content, 
productive efficiency, resistance to grazing and 
climatic extremes and the objectionable char- 
acteristics already discussed. Of course, the 
plant must be sufficiently palatable so that live- 
stock will eat it in quantity. When we know 
which species to favor, techniques must be de- 
veloped to shift vegetation composition toward 
an abundance of these selected species. Once 
this is done, we will begin to achieve the full 
productive potential of our rangelands. 
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69 
