Influence of naphthalene acetic acid (NAA) on yield and quality of wax apple (Syzygium samaragense)

The present study was conducted to investigate the effects of naphthalene acetic acid (NAA) on the yield and quality of wax apple. NAA at 0 (control), 10, or 30 ppm was applied to fruiting branches at small bud stage and again at petal fall stage on windless mornings with a truck mounted motorized sprayer until drip-off. Results showed that fruit length, fruit diameter, average fruit yield, and flesh thickness were highest at 30 ppm NAA treated branches compared to 10 ppm NAA treated and control branches. Crack/cluster decreased with increasing NAA concentrations. Lowest crack/cluster occurred in fruits treated with 30 ppm NAA. Number of seeds has no significance between treated and untreated fruits. Total soluble solids (TSS), pH, and vitamin C were also highest in 30 ppm NAA treated fruits and lowest in control fruits. Titratable acidity acid (TA) was decreased in treated fruits. From this experiment, we concluded that the spray of 30 ppm NAA has the best effects on fruit length, fruit size, and biochemical quality in wax apple fruits under field conditions.