An experiment was conducted to evaluate the growth and production of Acacia albida under agroforestry at Mafiga, Morogoro, Tanzania. The design used was a split plot, in randomized complete blocks and replicated four times. Three main plots were included: (1) trees intercropped annually with maize, (2) trees intercropped annually with beans) (3) tree monoculture maintained under clean weeding. Each main plot was subdivided into four subplots representing different tree densities: (1) no trees, (2) trees planted at 4 m × 4 m, (3) 5 m×5 m spacing, (4) 6 m× 6 m spacing. At the age of 6 years, the A. albida was assessed for height, diameter growth, volume and biomass production. The mean height and diameter at breast height of the trees at this age were 8.4 m and 10.7 m, respectively. Height growth was not affected either by intercropping or by tree spacing, but diameter growth was significantly reduced at 4 m×4 m tree spacing. Volume production varied from 9.9 m3 to 24.9 m3 ha1 and total biomass production from 12.4 to 28.3 ton ha1. Intercropping did not significantly influence tree volume and biomass production. However, spacing significantly influenced productivity with higher values obtained under close tree spacing and lower production under wide spacing. Food crop yields were low, varying from 200 to 400 kg ha1 for beans and 300 to 950 kg ha1 for maize. The yields were, however, not significantly affected by the presence of the trees, even at the closest spacing of 4 m × 4 m.
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DOI:
https://doi.org/10.1016/0378-1127(94)90292-5Skor altmetrik:
Jumlah Kutipan Dimensi:
Tahun publikasi
1994
Penulis
Bahasa
English
Kata kunci
agroforestry, biomass, crop yield, growth, intercropping, yields
Geografis
Tanzania
