Echer, F. R., Foloni, J. S. S., & Creste, J. E. (2009). Potassium sources in covering fertilization on cotton II - Nutritional status evaluation of crop. Semina: Ciências Agrárias, 30(4Sup1), 1145–1154. https://doi.org/10.5433/1679-0359.2009v30n4Sup1p1145