[Experimental work with sugar beets 1992]

abonos almacenamiento beta vulgaris chemical control clima climat climate control de enfermedades control de plagas cosecha crop yield cultivation cultivo disease control engrais ensayos de variedades escarda fertilizers harvesting harvesting date irrigation lutte antiravageur lutte chimique pest control plantas azucareras pratique culturale rendement des cultures rendimiento de cultivos riego stockage storage suecia sugar crops sweden variety trials weed control