Effect of cobalt and silver ions and naphthaleneacetic acid on fruit retention in mango (Mangifera indica L.).
Naqvi S. S. M., Alam S. M., Mumtaz S.
Author Affiliation: Atomic Energy Agricultural Research Centre, Tando Jam, Sindh, Pakistan.
Australian Journal of Experimental Agriculture 30 : 433-435
Abstract : In an experiment at Tando Jam, fruits on 10-year-old trees of cultivars Sindhri and Langra were sprayed twice to run off with aqueous solutions containing 10, 15 or 20 mg NAA/litre, 50, 100 or 150 mg AgNO3/litre or 50, 100 or 150 mg Co(NO3)2/litre when they had attained pea (5-6 mm) and marble (10-15 mm) size. In a second experiment, whole trees of cv. Dasehari were sprayed twice with distilled water, 20 mg NAA/litre, 100 mg AgNO3/litre or 100 mg Co(NO3)2/litre when fruits attained pea and marble size. NAA, AgNO3 and Co(NO3)2 increased fruit retention at all concentrations tested. In Sindhri, Co(NO3)2, AgNO3 and NAA treatments increased yields by 106-165%, 89-146% and 94-155%, respectively, and in Langra by 100-135%, 98-138% and 95-118%, respectively. Spraying whole trees of Dasehari with 100 mg Co(NO3)2/litre, 100 mg AgNO3/litre or 20 mg NAA/litre increased yields by 129, 66 or 54%, respectively.