Use of samples in a grid and of a geographical information systems to evaluate the variability of soil chemical parameters in the direct planting system.H. de Oliveira, Marcelo de Carvalho Alves, W. M. Silva et al.|Unknown|2000Cited by 0
Produtividade do algodoeiro em rotação com soja no sistema plantio direto.F. M. Fernandes, L. A. Staut, F. M. Lamas et al.|infoteca-e (Brazilian Agricultural Research Corporation)|2001Cited by 0