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).


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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