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PHOTOSYNTHESIS AND BIOMASS PRODUCTION BY MILLET (PENNISETUM GLAUCUM) AND TARO (COLOCASIA ESCULENTA) GROWN UNDER BAOBAB (ADANSONIA DIGITATA) AND NÉRÉ (PARKIA BIGLOBOSA) IN AN AGROFORESTRY PARKLAND SYSTEM OF BURKINA FASO (WEST AFRICA)

Published online by Cambridge University Press:  13 February 2012

JOSIAS SANOU ,
JULES BAYALA ,
PAULIN BAZIÉ  and
ZEWGE TEKLEHAIMANOT
JOSIAS SANOU*
Affiliation:
Institut de l'Environnement et de Recherches Agricoles (INERA)/Département Productions Forestières, 03 BP 7047 Ouagadougou 03, Burkina Faso
JULES BAYALA
Affiliation:
World Agroforestry Centre (ICRAF), ICRAF-WCA/Sahel Node, BPE5118 Bamako, Mali
PAULIN BAZIÉ
Affiliation:
Institut de l'Environnement et de Recherches Agricoles (INERA)/Département Productions Forestières, 03 BP 7047 Ouagadougou 03, Burkina Faso
ZEWGE TEKLEHAIMANOT
Affiliation:
School of the Environment and Natural Resources, University of Bangor, Gwynedd LLL57 2UW, UK
*
Corresponding Author: E-mail: josiassanou@yahoo.fr
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Summary

Photosynthesis and biomass production by millet (Pennisetum glaucum) and taro (Colocasia esculenta) grown under baobab (Adansonia digitata) and néré (Parkia biglobosa) was studied at Nobéré (Burkina Faso) with the aim of optimising parkland systems productivity. Millet yielded the highest biomass under Baobab and the lowest biomass was recorded in the zone close to the tree trunk of néré. In contrast, the biomass of taro was higher in heavy shaded zones under néré and the zone close to baobab's trunk. The two crops showed an increasing trend of photosynthesis rate (PN) from tree trunk to the open area. However, the increase in the PN of taro from tree trunk to the open field was lower compared to that of millet. By increasing its leaf area index (LAI) under shade, taro displayed higher biomass production under tree compared to the open area while an opposite trend was observed in millet. The high millet biomass production under baobab could be explained by light availability and the reduction of temperature under shade compared to the open field. The adaptation of taro to shade by increasing its LAI and thus avoiding drastic reduction in PN under shade resulted in better biomass production under heavy shade. Therefore, it was concluded that by replacing millet with taro under dense tree crowns the productivity of agroforestry parkland systems could be increased.

Type
Research Article
Information
Experimental Agriculture , Volume 48 , Issue 2 , April 2012 , pp. 283 - 300
Copyright
Copyright © Cambridge University Press 2012

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