The shrub species Tithonia diversifolia is widely distributed along farm boundaries in the humid and subhumid tropics of Africa. Green biomass of tithonia has been recognized as an effective source of nutrients for lowland rice (Oryza sativa) in Asia and more recently for maize (Zea mays) and...

Efforts to overcome declining soil fertility on smallholder farms in western Kenya must be consistent with the reality of low utilization of inorganic fertilizers. Likewise, organic inputs alone cannot supply adequate nutrients. The use of two organic resources, Tithonia diversifolia (tithonia) and ...

The authors hypothesize that trees can rapidly root into subsoil and capture NO₃ that may have accumulated in the subsoil horizons of agricultural soils of high anion sorption capacity. The vertical distribution of root length and inorganic N (NO₃ and NH₄) to 3.95-m soil depth was therefore...

The growth rates of 29 multipurpose trees grown in an agroforestry arboretum in Kenya for 6 years at a sub-humid to semi-arid climatic zone are presented. Species such as Grevillea robusta, Sesbania grandiflora, leucaena, Cassia siamea and Sesbania sesban, some of which were outside their...

Data are presented on the growth rates of 29 multipurpose species or varieties (Acacia albida, A. holosericeae [A. holosericea], A. salicana [A. salicina], A. saligna, A. stulmanii [A. stuhlmannii], A. tortilis, Balanites aegyptica [B. aegyptiaca], Cassia siamea, Casuarina equisetifolia, Grevillea...