Modelling the growing space of parkia biglobosa benth for agroforestry project
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Parkia biglobosa is a leguminous tree that plays a significant role in the socio-economic wellbeing of people especially in rural communities of sub-Saharan Africa. The trees are maintained on farms by farmers because of the benefits derived from them. Its inclusion in agroforestry practice is often limited due to inadequate information on appropriate growing space or planting distance. Agroforestry practice often requires the determination of planting distance in the form of alleys to reduce the effect of canopy cover. Therefore, in this study, the growing space requirement of P. biglobosa for agroforestry project was determined. The dataset used consists of 288 trees measured from the P. Biglobosa plantation in Markurdi, Nigeria. Quantile egression technique was used to establish a simple relationship between tree crown width (Cw) and diameter at breast height (dbh) of the species. This relationship was used to estimate the growing space required for the establishment of agroforestry project. The limiting density and stand basal area were also estimated. The result shows that the relationship of the form: Cw = 2.674 + 0.095dbh, explained 56.2% of the variation in crown width with a mean bias of 0.985. Also, the study shows e.g., that P. biglobosa trees of 10 cm dbh would each require 3.2 m of growing space with limiting density and basal area of about 982 trees/ha and 6.06 m2 /ha, respectively. Furthermore, trees of 50 cm dbh would each require 6.6 m of growing space with a limiting density and basal area of about 232 trees/ha and 35.86 m2 /ha, respectively. In agroforestry practice, alleys are predetermined from the onset of the project, and as such, information from this study could be used to determine the planting distance and the limiting density of the species. Thus, arable crops can be integrated between the alleys.
Keywords: Crown width; quantile regression; limiting density; stand basal area; Parkia biglobosa
ID: 3474105