Celem niniejszego badania była ocena wpływu doglebowego i dolistnego nawożenia potasem na plon bawełny nieoczyszczonej oraz na jakość włókien bawełny w stanie Goiás w południowo-wschodniej Brazylii. Wzrost plonu bawełny obserwowano zarówno w przypadku doglebowego nawożenia potasem (w postaci KCl), jak i oprysku dolistnego (w postaci KNO3), bez interakcji między sposobami stosowania. Przy czterech opryskach dolistnych azotanem potasu w odstępach 10-dniowych i dawce 8 kg KNO3 na oprysk uzyskano maksymalnie pięcioprocentowy (200 kg plonu/ha) wzrost plonu bawełny nieoczyszczonej (zob. Rysunek 1). Nie odnotowano wpływu dawki i sposobu nawożenia na jakość włókien bawełny w badanej odmianie Delta Opal.
Rysunek 1. Wpływ zwiększania dawki azotanu potasu na plon bawełny nieoczyszczonej.
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