Effects of shading on dry matter partitioning and yield of field-grown sunflower [dry matter: radiation quotient]

aerial parts contenido de materia seca crecimiento croissance crop yield dry matter content etapas de desarrollo de la planta feuille grain granos growth helianthus annuus hojas leaves oil crops ombrage plant developmental stages plantas oleaginosas radiation rendement des cultures rendimiento de cultivos shading stems tallo tige umbria