Petter, F. A., F. R. Andrade, A. M. Zuffo, M. M. de S. Monteiro, L. P. Pacheco, and F. A. de Almeida. “Doses and Time of Potassium Application on Corn Agronomic Performance Cultivated in a ‘Cerrado’ Area at Piaui State, Brazil”. Comunicata Scientiae, vol. 7, no. 3, Dec. 2016, pp. 372-8, doi:10.14295/cs.v7i3.1218.