Effect of Training on Branches Strength of Thomson Navel Orange

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Abstract

To evaluate the effect of training from on strength of branches of Thomson prange on poncirus rootstock, an experiment was conducted in Astara Citrus Station during 2008-2014, using factorial on the basis of randomized complete block design with five replications. The first factor was crotch angle (45, 65 degree and check) and number of branches (3, 4 and 5) was considered as the second factor. In the first two years, budding plants were produced and during the growth of buddingplants in the third year, treatments were applied. Trees were transplanted to the land according to the planting plan at the end of the third year. Heavy snow in February 2013 broke many of the branches in all treatment so that the perfect analysis of data could not be done according to the plan. However, analysis by chi-square method showed only significant correlation between the number of bloken branches and up trunk diameter of crotch. No correlation was detected between number of broken nranches and number of branch and crotch angle. Correlation between broken branches due to heavy snow, crotch angle and branch number was not also observed pulling of remaining limbs showed significant difference between maximum stresses at breaking and crotch angle. Branches with 65 degree crotch angle could handle more pressure than those with 45 degree crotch angle.

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References

Ataya, E., and Koyuncu, F. 2013. A new approach for augmenting branching of nursery trees and its comparison with other methods. Scientia Horticulturae 160: 345-350. Farrell, R.W. 2003. Structural Features Related to Tree Crotch Strength. Thesis Master of Science of Virginia Polytechnic Institute and State University Blacksburg, VA, USA. 64pp. Harris, R.W. 1992. Arboriculture: Integrated Management of Landscape Trees, Shrubs and Vines, 2nd ed. Englewood Cliffs NJ: Prentice Hall, London, UK. 674 pp. Shigo, A.L. 1985. How tree branches are attached to trunks. Canadian Journal of Botany 63: 1391-1401. Warner, J. 1991. Rootstock affects primary scaffold branch crotch angle of apple trees. HortScince 26(10): 1266-1267.
Seed and Plant Production Journal
Volume 31, Issue 2
August 2015
Pages 187-192

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