Abstract
Investigations were undertaken to explore the possibility of improving setting, retention and weight of fruits in ‘Early Seedless’ and ‘Calcuttia’ cultivars of lichi ( Litchi chinensis) by means of growth regulators. Indole acetic acid (IAA) at 20, 40 and 80 mg l −1, 2,4-dichlorophenoxy acetic acid (2,4-D) at 2,4 and 8 mg l −1 and gibberellic acid (GA 3) at 50, 100 and 150 mg l −1 were sprayed on panicles in the first fortnight of April, when 50–100% flowers had opened. All 3 growth regulators caused a favourable effect on fruit setting, fruit retention and weight of individual fruits, but IAA at 20 mg l −1 proved the best for enhancing setting, GA 3 at 50 mg l −1 for increasing retention and GA 3 at 100 mg l −1 for improving fruit weight. IAA and GA 3 should, therefore, be used in combination. Between the 2 cultivars tested, ‘Calcuttia’ proved superior to ‘Early Seedless’ in fruit setting, fruit retention and weight of individual fruits.
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