Growth Performance Of Two Evergreens And Three Deciduous Indigenous Trees Of Ethiopia On Degraded Land At Tulu Korma

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A study was conducted on young trees of Prunus africana (Hook. f.) Kalkman,rnPodocarpus falcatus (Thunb.) Mirb., Millettia ferruginea (Hochst.) Baker, Cordiarnafricana Lam., and Croton macrostachyus Del., planted and maintained within the landrnholdings of the Center for Indigenous Trees Propagation and Biodiversity Development.rnThe Center is located at 47 Km west of Addis Ababa, along the highway to Ambo. Fromrna mixed stand of young trees planted 5 months before the start of this study, 200 seedlingsrnof P. africana, 185 seedlings of each of P. falcatus, C. africana, and M. ferruginea, andrn110 plants of C. macrostachyus were randomly selected and tagged with labeled metalrntags. These were followed up for 8 months from October 2005 to May 2006 by assessingrnparameters such as height, diameter growth, survival, relative growth rate, tip dieback andrndamage by browsers. During the study period, care and management activities such asrnwatering at intervals of 3 days during the dry months, weeding, hoeing the seedlings,rnmulching, dung application, fencing and guarding were carried out. Guarding was donernregularly, but other activities were done when necessary. Data on plant height wererncollected every 45 days; root collar diameter measurements were done at the end of thernexperiment; extent of survival and mortality and damage by browsers were inspectedrnevery month. Relative growth rates were calculated for the plant height taking the periodrnof time between two successive measurements. Data were subjected to One Way Analysisrnof Variance (ANOVA) and Tukey’s Honest Significant Difference Test at P = 0.05.rnGrowth performances of all species varied significantly regardless of the similarrntreatments administered. Consequently, for variables such as height, survival, relativerngrowth rate in plant height, and tip dieback M. ferruginea performed better compared tornall the other species; C. africana was good in root collar diameter increase, but ca 31.4%rnexperienced dieback at the tip. Prunus africana was good in height increment, but carn14.5% of the seedlings was damaged by browsing animals. C. macrostachyus was good inrnrelative growth rate of seedling height, but 6.4% of the stock was damaged by tip dieback.rnPodocarpus falcatus was lowest in all the parameters measured, but was very good inrnterms of percentage survival. Overall, seedlings survival of the studied species wassignificantly higher during the period of rainfall and months of well-watering than duringrnthe dry and months less-watering. Soil analysis of the study site yielded a value of 1.3rnppm for available P, 0.071% of total N, and 1.6% of organic C. The values for available Prnand total N were below the standard minimum values, while that for organic C wasrnsomewhat marginal, thus warranting the classification of the site as degraded.

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Growth Performance Of Two Evergreens And Three Deciduous Indigenous Trees Of Ethiopia On Degraded Land At Tulu Korma

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