Evaluating the residual effects of sludge in root distribution and heavy metals in sugar cane crop - Silva, P. F. C.; Fante Junior, L.; Pilotto, J. E.; Rodrigues, J. A.; Boaretto, Antonio Enedi; Oliveira, J. C. M. de; Berton, R. S.; Zotelli, H. B. (International Sugar Journal, 2000)