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INFLUENCE OF GROWTH-REGULATORS, COBALT AND SILVER IONS ON FRUIT DROP IN
MANGO (MANGIFERA-INDICA L)
NAQVI SSM; ALAM SM; MUMTAZ S
Abstract: Pre-mature fruit drop decreases mango yield. The effect of aqueous
sprays of 1-naphthaleneacetic acid (NAA), gibberellic acid (GA3), silver
nitrate (AgNO3) or cobalt nitrate [Co (NO3)2], 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.
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