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RDA analysis using fertilizer dose and herbicide load as explanatory variables on 21 countries where comparable data were available. AT, Austria; BE, Belgium; BU, Bulgaria; CH, Switzerland; CZ, Czech Republic; DE, Germany; DK, Denmark; ES, Spain; FL, Finland; FR, France; GR, Greece; HU, Hungary; IT, Italy; NL, The Netherlands; PL, Poland; PT, Portugal; RO, Romania; SE, Sweden; SK, Slovakia; SL, Slovenia; UK, United Kingdom.
