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

A two- year trial was conducted during 2007 and 2008 seasonson guava trees cv. Montakhab El-Sabahia. The trees were sprayed atfull 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 andthree months later (6) 150 ppm GA3 and three months later (7) 75ppm GA3 at full bloom and 5o ppm NAA three months later (8) 50ppm NAA at full bloom+ 50 ppm nicotinic acid three months laterand (9) 75 ppm GA3 at full bloom +200 ppm L-cysteine three monthslater. Conclusively, (75 ppm GA3 at full bloom +200 ppm L-cysteine,three months later) and (50 ppm NAA at full bloom +50 ppmnicotinic acid three months later proved to be the most effectivetreatments in reducing fruit shedding either during June or preharvest drop as well as reducing fruit seed content. Besides, asignificant positive correlation was found between weight of 100seeds on one hand and June drop and number of harvested fruits pertree on the other one.