Echer, Fábio Rafael, José Salvador Simoneti Foloni, and José Eduardo Creste. 2009. “Potassium Sources in Covering Fertilization on Cotton II - Nutritional Status Evaluation of Crop”. Semina: Ciências Agrárias 30 (4Sup1):1145-54. https://doi.org/10.5433/1679-0359.2009v30n4Sup1p1145.