Grisso, Robert D.Alley, Marcus M.Thomason, Wade E.Holshouser, David L.Roberson, Gary T.2014-04-172014-04-172011-08-01http://hdl.handle.net/10919/47448Discusses the two basic variable-rate application technologies, map-based and sensor-based, for fertilizer, lime, weed control, and seed.16 pagesapplication/pdfenVirginia Cooperative Extension materials are available for public use, re-print, or citation without further permission, provided the use includes credit to the author and to Virginia Cooperative Extension, Virginia Tech, and Virginia State University.Machinery EconomicsSpraying equipment -- CalibrationSowing -- Equipment and suppliesWeeds -- ControlFertilizers -- ApplicationExtension publicationhttp://pubs.ext.vt.edu/442/442-505/442-505_PDF.pdfSprayingSpreadingSowing ratesSeed broadcastersWeed controlFertilizer distributors