ANDREW SACKS / AGSTOCKUSA / SCIENCE PHOTO LIBRARY ANDREW SACKS / AGSTOCKUSA / SCIENCE PHOTO LIBRARY
Applying fertiliser. Liquid manure or sludge being injected into a field of stubble by a Terra-Gator tractor and tank system. This organic fertiliser is usually applied to farmland before planting to replenish nutrients that have been lost from the soil. Photographed in Michigan, USA.
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