In a study in Argentina 9 kg KNO3/ha/spray was applied two or three times, at a weekly interval, starting at first flower appearance. Both foliar treatments increased significantly lint yield, lint percentage, micronaire and fibre length (Tables 1 and 2), when compared to the untreated control plot. On the parameters tested, there was no statistically significant difference between the numbers of KNO3 sprays (i.e. 2 or 3 sprays) applied.
Table 1. The effect of foliar applied potassium nitrate dose rates on lint yield, fertilizer use efficiency, % lint and the seed index.
Table 2. The effect of foliar applied potassium nitrate dose rates on micronaire, fibre length, length uniformity and fibre strength.