Cotton seed yield, viability and seedling vigour as affected by plant density, growth retardants, copper and manganese

cobre copper cottonseed crop yield cuivre ensayo de semillas essai de semences gossypium graine de coton growth inhibitors inhibidores del crecimiento manganese manganeso rendement des cultures rendimiento de cultivos retardateur de croissance seed seed longevity seed testing semence semillas viabilidad viabilidad de la semilla viability