Abstract
<i>Jatropha curcas L.<i/> (JCL), an oleaginous species traditionally used as live fence, is massively planted in Africa to produce biofuel. However, the influence of many factors on its productivity remains scientifically unknown. This study aimed to assess the effect of subsoiling (factor 1 : subsoiling and control) and plant material provenance (factor 2 : Casamance and Diobass) on its development and productivity. The results have shown two years after planting that plant provenance had a significant effect on growth variables, plant above ground architecture and fruits number. The Casamance provenance has generally produced the highest values. Subsoiling did not have a significant effect on most of the studied variables, except for low primary branches number and fruiting branches number. Even more, subsoiling appeared to enhance JCL growth. These results have allowed to understand the importance of provenances but also of soil preparation on the performances of JCL and to identify priority areas for research.
Highlights
Jatropha curcas L. (JCL ou pourghere), originaire d’une zone couvrant le Mexique, l’Amerique centrale, le Bresil, la Bolivie, le Perou, l’Argentine et le Paraguay, est un arbuste de [5,6,7] m qui appartient a la famille des Euphorbiaceae (USDA ANGRPNGRLBM, 2007)
The results have shown two years after planting that plant provenance had a significant effect on growth variables, plant above ground architecture and fruits number
Jatropha curcas infromation from Germplasm Resources Information Network - (GRIN) [Online Database]
Summary
La plantation du materiel vegetal de l’etude, compose de deux provenances (facteur 1 : Casamance et Diobass), a ete realisee en 2008. Les plants de JCL ont ete irrigues durant 12 mois, a raison de deux arrosages de 8 L/plant/semaine pour leur assurer une bonne alimentation hydrique. Le sous-solage a semble augmenter le diametre des deux provenances (Casamance : 12 Æ 1 cm dans la parcelle sous solee et 11 Æ 0,8 cm dans le temoin ; Diobass : 10 Æ 0,7 cm pour le travail du sol et 8 Æ 0,6 cm pour le temoin). Hauteur totale La hauteur totale des plants de JCL a egalement significativement (p = 0,0012 ; tableau 1) varie en fonction de la provenance, avec une moyenne de [1,8] m (Æ 0,004) pour la provenance Casamance et [1,5] m (Æ 0,004) pour la provenance Diobass. Par contre elle est restee invariable (97 %) chez la provenance Casamance, quel que soit le traitement
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