First Sentence:
Weeds exist as a category of vegetation because of the human ability to select for desirable traits among the various members of the plant kingdom.
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Key Phrases - Statistically Improbable Phrases (SIPs):
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triazine ban, individual plant weight, weed control tactics, weed control procedures, moisture extraction profiles, total plant density, atrazine ban, ryegrass density, herbicide decomposition, herbicide entry, reciprocal yield law, forest vegetation management, other triazine herbicides, weed abundance, plant growth analysis, herbicide selectivity, herbicide movement, annual weed species, rolling cultivators, herbicide absorption, many weed species, following herbicide application, atrazine use, weed evolution, competitive ruderals
Key Phrases - Capitalized Phrases (CAPs):
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United States, Oregon State University, University of California, Great Basin, Low Roots, North America, New York, National Research Council, None Roots, Environmental Protection Agency, Great Britain, John Wiley, Arthropod Species Plant Attacked, Central Valley, Department of Agriculture, Soybean Giant, Weeds of California, Weeds Present Change, Absorbed Usual Concentration, American Naturalist, American Society of Agronomy, Arthropod Species Change, Corn Belt, Julian Days, None Foliage
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