The plot size varied across treatments: 6 × 11 m for sole Leucaena and
annual crop systems, 10 × 11 m for the narrow-alley and 15.6 × 11 m for
the wide-alley agroforestry systems. Crop and Leucaena yields were measured
leaving sufficient border on all sides from net plots of 32 m 2 for sole
Leucaena and annual crops, 73 m 2 in the narrow-alley system and 54 m 2 in
the wide-alley system. The annual crop system was pearl millet (Pennisetum
glaucum (L) Br.)/pigeonpea (Cajanus cajan L. Millsp) intercrop in the 1984
and 1986 cropping seasons, castor (Ricinus communis) in the 1985 and
groundnut (Arachis hypogea L.) in the 1987 cropping season.