Catholique;
De;
Bukavu;
(UCB);
DR;
Congo;
University;
Nairobi;
Kenya;
of;
Applied;
Physical;
Chemistry--lSOFYS;
Faculty;
Bioscience;
Engineering;
Ghent;
Coupure;
6539000 Gent;
Belgium;
Soil;
Biology;
and;
Fertility;
the;
International;
Institute;
Tropical;
Agriculture;
(TSBF-CIA;
T);
Agro-forestry;
Center;
(ICRAF);