@article{articleb3717124,
title   = {Optimum size in grid soil sampling for variable rate application in site-specific management},
author = {Nanni, Marcos Rafael and Povh, Fabrício Pinheiro and Demattê, José Alexandre Melo and Oliveira, Roney Berti de and Chicati, Marcelo Luiz and Cezar, Everson},
year = {2011},
doi = {10.1590/S0103-90162011000300017},
journal   = {Scientia Agricola}
}