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