Aquino, R.E. de, Campos, M.C.C., Soares, M.D.R., Oliveira, I.A., Franciscon, U., Silva, D.M.P. and Cunha, J.M. 2016. Chemical soil attributes evaluated by multivariate techniques and geostatistics in the area with agroforestry and sugarcane in Humaitá, AM, Brazil . Bioscience Journal . 32, 1 (Jan. 2016), 61–72. DOI:https://doi.org/10.14393/BJ-v32n1a2016-29421.