INFLUENCE OF GROWTH REGULATORS, COBALT AND SILVER IONS ON FRUIT DROP IN MANGO (MANGIFERA INDICA L.).

Abstract

Pre-mature fruit drop decreases mango yield The effect of aqueous sprays of l-naphthaleneacetic acid (NAA), gibberellic acid (GA3), silver nitrate (AgNO3) or cobalt nitrate 'Co (NO3)21. alone or in combination, on fruit retention in mango (cv. Sindhri) was studied. Spray was done - once when fruitlets were of pea-size and then two weeks later when fruitlets increased to marble-size. Compared to control, applications of Co (100 mg/L), Ag (100 mg/L) ions, NAA (20 mg/L) and GA3 (50 mg/L) enhanced fruit retention by 131, 127, 100 and 50%, respectively. No additive effect was observed when these chemicals were sprayed in combination.