EFFECT OF SOME GROWTH REGULATORS ON GROWTH AND YIELD OF GUAVA TREES (Psidium guajava, L.) cv. Montakhab El-Sabahia

Document Type : Research articles.

Authors

1 Hort. Dept., Fac. of Agric. Fayoum, Univ. Egypt

2 Agric. Botany Dept., Fac. of Agric. Fayoum, Univ. Egypt

Abstract

A two- year trial was conducted during 2007 and 2008 seasons
on guava trees cv. Montakhab El-Sabahia. The trees were sprayed at
full bloom with one of the following solution: (1) tap water
"control",(2)50 ppm NAA at full bloom, (3)75 ppm GA3 at full bloom ,
(4) 150 ppm GA3 at full bloom (5) 75 ppm GA3 at full bloom and
three months later (6) 150 ppm GA3 and three months later (7) 75
ppm GA3 at full bloom and 5o ppm NAA three months later (8) 50
ppm NAA at full bloom+ 50 ppm nicotinic acid three months later
and (9) 75 ppm GA3 at full bloom +200 ppm L-cysteine three months
later. Conclusively, (75 ppm GA3 at full bloom +200 ppm L-cysteine,
three months later) and (50 ppm NAA at full bloom +50 ppm
nicotinic acid three months later proved to be the most effective
treatments in reducing fruit shedding either during June or preharvest drop as well as reducing fruit seed content. Besides, a
significant positive correlation was found between weight of 100
seeds on one hand and June drop and number of harvested fruits per
tree on the other one.

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