A field experiment was conducted during 2016-17 and 2017-18 at Instructional Farm, Krishi Vigyan Kendra, Jharsuguda in Guava (Psidium guajava L.)” with an objective to evaluate the effect of plant growth regulation practices (both cultural and chemical methods) on vegetative growth, flowering and yield. The soil of the experimental orchard is red laterite and the climatic condition of the region is sub-tropical dry climate having hot and dry summer and mild winter. The experiment consisted of 8 treatments viz.,T₁:Control,T₂: Shoot bending; T₃: 10 cm pruning with complete removal of old leaves, in April-May ; T₄: 50 % fruit thinning randomly by hand at an average fruit weight 15 -20 g in April-May ; T₅: Foliar spray of Naphthalene Acetamide (NAD) @ 50 ppm twice at 15 days interval during April-May ; T₆: Foliar spray of (2, 4-D) @ 60 ppm, twice at 15 days interval in the during April-May; T₇: Foliar spray of urea @ 15%, twice at 15 days interval during April-May and T₈: Foliar spray of Dinitro Ortho Cresol (DNOC) @ 10ppm, twice at 10 days during April-May. These 8 treatments were evaluated in randomized block design with three replications. From the experiment, it was found that untreated treatment (Control i.e. T₁) resulted tallest plant while minimum plant height was recorded in Bending (T₂). The canopy spread in East-West and North-South were recorded highest in T₃ (10 cm pruning). Number of days required for emergence of new shoot was recorded minimum of (18.00 & 19.2 days) shoot bending (T₂) and 10 cm pruning (T₃) respectively while it was highest (35.8 days) in the untreated control (T₁). Shoot bending (T₂) treatment took minimum days (43.5 days) while control plants (T₁) took maximum days (50.5days) for initiation of flowers in the new shoots. The period required for fruit maturity varied from 126.7 days in bending (T₂) to 134.5 days in control plants (T₁). Shoot bending (T₂) recorded highest number of fruits per plant during both the years and were significantly different from other treatments. From the mean data heaviest fruit (133.6 g) was obtained in T₅ (50 ppm NAD) followed by in129.7g in T₃(10 cm pruning) and 129.2 g T₆ (60 ppm 2,4-D) whereas lowest fruit weight was obtained in control (88 g). Similarly, 50 ppm NAD (T₅) gave highest fruit yield (8.80 kg/plant) closely followed by in T₃(10 cm pruning) with a yield of 7.88 kg/plant. The lowest yield was recorded in control (5.43 kg/plant).

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