ED YOUNG / AGSTOCKUSA / SCIENCE PHOTO LIBRARY ED YOUNG / AGSTOCKUSA / SCIENCE PHOTO LIBRARY
Crop spraying. Farmer on a vehicle spraying herbicide amongst rows of grape vines, Vitus sp.. Herbicides are a requirement of modern agriculture because weeds which gain a foothold in the uniform habitat provided by large fields of a single crop can spread rapidly. The weeds compete with the crop plants for light and soil nutrients and so can affect the size of the harvest. Photographed near Fresno in California, USA.
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