Journal of Horticultural Science & Ornamental Plants 3(1): 01-10, (2011)
Effect of Ringing and Amino Acids Application on Improving Fruiting of Le Conte Pear Trees
M.A. Fayek, T.A. Yehia, E.M.M. El-Fakhrany and A.M. Farag

Abstract: This study was conducted on 12 years Le Conte pear trees during three successive seasons. This investigation aimed to evaluate the effect of different tree ringing and amino acids foliar spray treatments to improve flowering, fruit set and fruit characteristics of Le Conte pear trees. Residual effects of the applied treatments which were measured in the second and third seasons of this investigation showed that main branches ringing and one g/L amino acids foliar spray with trunk ringing resulted in the highest significant number of floral spurs/m and number of flowers/spur. All the applied treatments significantly increased initial fruit set, final fruit set and yield compared to the control trees in both seasons of the study. Moreover, the highest significant level of fruit set, yield, fruit weight and number of seeds/fruit resulted from one g/L amino acids foliar spray treatment with or without main branches ringing in the two successive seasons. Similarly all of the applied treatments significantly increased fruit softening but not affected on other fruit characteristics during both seasons. Thus, in this study either to apply one g/L amino acids foliar spray treatment with or without main branches ringing could be recommended from results as they significantly increased productivity of Le Conte pears trees.


The influence of polyamines in increasing fruit set has been observed in apple (Malus domestica Borkh.) and Comice pear. Particularly in Comice pear, putrescine enhanced pollen tube ovule penetration and delayed ovule senescence without affecting flower ethylene production [9]. It has been suggested that polyamines reduce senescence rates in some plant tissues by antagonism with ethylene, possibly by competing for S-adenosylmethionine, a common precursor of both plant bio-regulators [7].


The general positive effects of amino acid foliar spray applications could be attributed to enhanced pollen tube ovule penetration and delayed ovule senescence which increases fruit set and yield. Similar findings were reported on pear [7, 9]. Also it was reported that direct effect of girdling increased yield per tree and fruit weight of Anna apple [12] and Canino apricot [13].

Girdling, Ringing, Binding