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An experiment was conducted on the effects of plant growth regulators (SA@100ppm, GA3@100ppm, NAA@200ppm) and micronutrients (ZnSO4 + Boric acid, ZnSO4 + Boric acid + CuSO4, ZnSO4 + Boric acid +MgSO4, ZnSO4 + Boric acid + CuSO4 + MgSO4 each at 0.4%) on fruit set, fruit drop and fruit retention in fifteen year old guava cv. L-49 under randomized block design with factorial concept was conducted at Fruit research station, Sangareddy, SKLTSHU, Telangana. Yield attributing parameters like fruit set (%), fruit retention (%) and fruit drop (%) were recorded. Among PGRs, NAA@200ppm has recorded significantly highest fruit set (71.08%), fruit retention (75.01%) and lowest fruit drop (25.16%). Among micronutrients, ZnSO4 @ 0.4% + Boric acid @ 0.4% + CuSO4 @0.4% + MgSO4 @0.4% has recorded significantly highest fruit set (68.06%), fruit retention(71.79%) and lowest fruit drop (33.62%). In interaction effects, NAA@200ppm and ZnSO4 @ 0.4% + Boric acid @ 0.4% + CuSO4 @0.4% + MgSO4 @0.4% has recorded significantly maximum fruit set (76.15%), fruit retention (78.25%). Minimum fruit drop percentage (21.75%) was recorded in the same treatment. NAA@200ppm and ZnSO4 @ 0.4% + Boric acid @ 0.4% + CuSO4 @0.4% + MgSO4 @0.4% was superior in improving the flowering parameters of guava cv. Lucknow-49.

indian journal of pure and applied biosciences

Effect of Pre Harvest Sprays of Plant Growth Regulators and Micronutrients on Fruit Set, Fruit Drop and Fruit Retention of Guava (Psidium guajava L.) cv. Lucknow-49