Une étude a été conduite en Argentine, consistant à appliquer du KNO3 à raison de 9 kg/ha/pulvérisation deux ou trois fois à une semaine d’intervalle à partir de l’apparition de la première fleur. Les deux traitements foliaires ont significativement augmenté le rendement en fibre de coton, le pourcentage de fibre, le micronaire et la longueur des fibres (Tableaux 1 et 2), par rapport à la parcelle témoin non traitée. Sur les paramètres testés, aucune différence statistiquement significative n’a été observée entre les nombres de pulvérisations de KNO3 (à savoir deux ou trois) effectuées.
Tableau 1. Effet du dosage du nitrate de potassium en application foliaire sur le rendement en fibre de coton, l’efficacité d’utilisation de l’engrais, le pourcentage de fibre et l’indice de graines.
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Tableau 2. Effet du dosage du nitrate de potassium en application foliaire sur le micronaire, la longueur des fibres, l’uniformité de la longueur et la résistance des fibres.
