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acre aerial application Agri Agricultural Engineering Agricultural Research Service amount animals areas automatic average baler bales barn buildings capacity changes chines conveyor corn cost cotton cows crop dairy developed dollars drier drying duction economic efficiency eggs electric equipment facilities farmers farmstead feed feet fertilizer field field capacity forage forage harvester fruit fuel gasoline grain handling handtrucks harvesting heat horsepower ical improved inches increased industry irrigation labor land less livestock load machine machinery man-hours manufacturers materials mechanical ment methods milk million moisture move needed nomic operation packing percent plant plow potatoes poultry pounds reduce refrigeration refrigerator cars Research rural seed seedbed silage silo soil storage stored structures sumer surface temperature thousand tillage tion traction engine tractor trailers trucks tural unit usually vegetables wheels windrow workers