@ARTICLE {UTULU: 1986, title = {Persistence and downward movement of some selected herbicides in the humid and sub-humid tropics}, author = {Utulu, S. N. and Akobundu, I. and Fayemi, A. A. A. }, journal = {Crop Protection}, year = {1986}, volume = {5}, pages = {129--136}, issn = {0261-2194}, }