Potassium nitrate proved to be the preferred foliar K-source in cotton

Five sources of potassium for foliar fertilization were compared in this study. Dose rates of N and K applied were equivalent to 11,2 kg KNO3/ha in 93 liters of solution/ha. For the control and other treatments than KNO3 1,5 kg N/ha as urea was applied to equal the N rate supplied by the KNO3 treatment. In total 5 sprays were applied at 2, 4, 6, 7 and 8 weeks after the start of flowering. The KNO3 treatment resulted in the greatest lint yield (Figure 1).

Figure 1.Effect of foliar applications of five K sources on cotton yield (kg lint/ha).

Author

Miley, W.N., D.M. Oosterhuis, and L.D. Janes. 1994. Effects of foliar application of five potassium fertilizers on cotton yield and quality. Arkansas Soil Fertility Studies 1993. Arkansas Agri. Exp. Sta. Research Series 436: 62-66.

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