@ARTICLE {RISASI:1998,
title = {Assessment of N availability of roots of selected woody species and maize},
author = {Risasi, E. L. and Kang, B. and Opuwaribo, E. E. },
journal = {Biological Agriculture and Horticulture},
year = {1998},
volume = {16},
number = {1},
pages = {87--96},
issn = {0144-8765},
}