GROWTH REGULATORS INFLUENCING YIELD AND QUALITY OF PINEAPPLE [ANANAS COMOSUS (L) MERR]R. Pal, S. K. Mahato, Binoy Chhetri and C. P. Suresh
An investigation was carried out at Horticultural Research Station of Uttar Banga Krishi Viswavidyalaya, Cooch Behar (West Bengal), India during 2009 and 2010 seasons to study beneficial effects of plant growth regulators on fruit characters and yield in pineapple cv. Kew as regulation of cropping is very essential in this crop. Plants were subjected to foliar spray of eight treatments (NAA at 10 ppm and Ethrel at 50, 100 and 150 ppm in alone as well as their combinations whereas control as water spray) with three replications in a Randomized block design. The herbs were sprayed after 5.00 p.m. during winter when the average number of leaves per plants was about 40 to 50 in numbers. Results revealed that application of Ethephon applications (50 ppm) causes an increase in flowering percentage causes early flowering and reduces duration of flowering while pineapple takes minimum days for fruit maturity on ethrel (Ethephon) at the rate of 100 ppm along with NAA (10 ppm) treatment. Fruit length, crown length, fruit girth, fruit weight, fruit crown ratio value, pulp weight, pulp peel ratio, pulp core ratio and pulp percentage were significantly increased by NAA application (10 ppm) as compared with control. Juice content was significantly increased and highest value was observed on spraying of Ethrel (100 ppm) along with NAA (10 ppm). Ethrel (50 ppm) with NAA (10 ppm) treatment showed an increase in TSS percentage and total sugar content. In respect of reducing sugar ethrel (150 ppm) treatment had the highest reducing sugar content while ethrel (100 ppm) was optimum for obtaining highest TSS acid ratio. However, growth regulators spray led to an increase in ascorbic content as compared with the other treatments and water spray (control) gave the lowest value. From overall observations Ethrel 50 ppm in combination with NAA 10 ppm for good quality fruits as well as higher yield while NAA 10 ppm can be recommended for maximum flowering, highest fruit weight as well as higher yield with optimum quality.
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