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Le nitrate de potassium s’est avéré être la source de K foliaire préférée dans le coton.

 Cinq sources de potassium pour la fertilisation foliaire ont été comparées dans le cadre de cette étude. Les doses de N et K appliquées étaient équivalentes à 11,2 kg de KNO3/ha dans 93 litres de solution/ha. Pour le contrôle et les autres traitements que le KNO3, 1,5 kg de N/ha d’urée a été appliqué pour égaler le taux de N fourni par le traitement au KNO3. Au total, 5 pulvérisations ont été appliquées à 2, 4, 6, 7 et 8 semaines après le début de la floraison. Le traitement au KNO3 a donné le meilleur rendement de lin (Figure 1).

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Figure 1 : Effet des applications foliaires de cinq sources de K sur le rendement du coton (kg lin/ha).

Autor

Miley, W.N., D.M. Oosterhuis, et L.D. Janes. 1994. Effets de l’application foliaire de cinq engrais potassiques sur le rendement et la qualité du coton. Arkansas Soil Fertility Studies 1993. Arkansas Agri. Exp. Sta. Research Series 436 : 62-66.

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