University of Khartoum

Studies on Response of Guava (Psidium guajava L.)Trees to Different Pruning Techniques

Studies on Response of Guava (Psidium guajava L.)Trees to Different Pruning Techniques

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Title: Studies on Response of Guava (Psidium guajava L.)Trees to Different Pruning Techniques
Author: Hussein, Mudathir Abdalla
Abstract: This investigation was initiated to shed some lights on the response of guava crop to different pruning techniques carried out at both nursery and orchard conditions. Under nursery conditions, four pruning techniques were utilized, namely, removal of 20% and 40% of the total leaves, root pruning and the combination of removal of 30% of leaves plus root pruning. The results reaveled that all pruning techniques resulted in significantly greater increases in plant height and stem diameter than the control. No clear pattern was noted regarding other growth parameters in terms of number of leaves and relative growth rate; however, root pruning resulted in greater values than the rest of the treatments. Removal of 40% of leaves associated with greater values of both fresh and dry weights compared to the other treatments. No significant differences were noted among the treatments regarding CHO, N and C/N ratios. Under orchard conditions, techniques of fruit thinning, twig pruning and root pruning were used. Fruit thinning experiment consisted of four treatments, namely, thinning to one fruit per cluster, thinning 25% and 50% of fruits per cluster and control. Generally, thinning technique of 50% resulted in greater yield (number and weight of fruits) compared to the other treatments. No significant differences were noted in fruit quality (fruit weight and TSS) as well as the values of both fresh and dry weights of leaf samples among the treatments. weight and TSS were not significant among the treatments; however, the greatest values were associated with 40% twig pruning and the lowest with control. Generally, 40% twig pruning resulted in the greatest values of both fresh and dry weights of leaf samples collected at different times. the differences in the values of CHO, N and C/N ratios were not significant among the treatments. The detected levels of auxins and gibberellins in the leaves demonstrated that all pruning techniques tended to increase these levels. Generally, the aboveground pruning techniques resulted in greater increases than root pruning. Pruning carried out in mid June, mid July and mid August months showed variations in the recorded parameters. Pruning trees in mid June resulted in significantly greater number of flushes than control. Root pruning carried out in mid July resulted in significantly greater flushes compared to the other treatments. Mid August pruning showed no significant differences in the number of flushes among the treatments. Yield tended to vary among the treatments depending upon the time of pruning. No significant differences were noted in fruit quality (weight of fruit and TSS) among the treatments, regardless of month of pruning. Generally, it seems that guava at different stages of growth tended to respond to pruning techniques; however, this response varies with the time of pruning.
URI: http://khartoumspace.uofk.edu/handle/123456789/11759
Date: 2015-06-14


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