Millet production under pruned tree crowns in a parkland system in Burkina Faso |
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| Authors: | J Bayala Z Teklehaimanot S J Ouedraogo |
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| Institution: | (1) Département Productions Forestières, INERA, 04 BP 8645 Ouagadougou 04, Burkina Faso;(2) School of Agricultural and Forest Sciences, University of Wales, Bangor, Gwynedd, LLL57 2UW, UK (Author for correspondence |
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| Abstract: | As a tree management tool, three treatments of crown pruning (total-pruning, half-pruning and no-pruning) were applied to
Vitellaria paradoxa (karité) and Parkia biglobosa (néré) in agroforestry parkland systems in Burkina Faso. The area under each tree was divided into four concentric tree influence
zones (Zones A: up to 2 m from the tree trunk, B: up to half of the radius of the tree crown, C: up to the edge of the tree
crown and D: up to 2 m away from the edge of the tree crown). Millet production under these zones and outside was assessed
during two cropping seasons over the study period of three years and the results showed that tree crown pruning had significant
effect on millet production and the highest millet grain yield and total dry matter were produced under total-pruned trees
(507 ± 49 and 2033 ± 236 kg ha−1 year−1, respectively). Light transmission, transpiration and soil nutrient status under the trees were also analysed in relation
to millet production. The results of the analysis showed that total-pruned trees gave the highest millet production due to
the reduction by crown pruning of the effects of large tree crowns on PAR transmission below crowns and rates of transpiration
by trees. Soil was more fertile closer to the tree trunks than outside tree crowns. This may also be one of the reasons why
millet overall performed better under Zone B than outside tree crowns. The higher production of millet under Zone B than under
Zone A, the zone closer to the tree trunk, may be due to lower light intensity and more intense competition for water between
trees and crops under Zone A. It was concluded that at least in the short term millet production could be improved by crown
pruning of both karité and néré, but long term effects may depend on the ability of the trees to maintain the amelioration
of soil fertility and on how quickly the trees recover from pruning.
This revised version was published online in June 2006 with corrections to the Cover Date. |
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| Keywords: | light intensity Parkia biglobosa soil nutrient status transpiration tree-crop interaction Vitellaria paradoxa |
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