Variability of sugar beet plants traits in the canopy, yielding and root quality as influenced by environment-technological factors

abonos nitrogenados application foliaire application rates azucares beta vulgaris calidad canopy caracteres de rendimiento composante de rendement couvert crop yield cropping systems cubierta de copas date de semis dose d'application environmental factors facteur du milieu factores ambientales fecha de siembra fertilisation fertilizer application field experimentation foliar application harvesting date indice de surface foliaire leaf area index nitrogen fertilizers plant anatomy plant population quality racine remolacha azucarera rendement des cultures rendimiento de cultivos roots sistemas de cultivo sowing date statistical methods stems sucres sugarbeet sugars tallos tige weather yield components