Effect of Plant Growth Regulators on Growth and Yield of Guava (Psidium guajava L.) cv. Gwalior-27 in the Gird Agro-climatic Zone of Madhya Pradesh, India
Gourav N *
School of Agriculture Science, Vikrant University, Gwalior, Madhya Pradesh, India.
Arun Sahu
School of Agriculture Science, Vikrant University, Gwalior, Madhya Pradesh, India.
Sachin Kumar Singh
School of Agriculture Science, Vikrant University, Gwalior, Madhya Pradesh, India.
Jay Prakash Thakur
School of Agriculture Science, Vikrant University, Gwalior, Madhya Pradesh, India.
Hirdesh Kumar
School of Agriculture Science, Vikrant University, Gwalior, Madhya Pradesh, India.
Mandvi Srivastava
School of Agriculture Science, Vikrant University, Gwalior, Madhya Pradesh, India.
*Author to whom correspondence should be addressed.
Abstract
A field experiment was conducted during Mrig Bahar 2025–26 at the Guava Orchard, Vikrant University, Gwalior, Madhya Pradesh, to evaluate the response of guava (Psidium guajava L.) cv. Gwalior-27 to the foliar application of gibberellic acid (GA₃), naphthalene acetic acid (NAA) and their combinations. The experiment was laid out in a factorial randomised block design with nine treatments and three replications. The treatment schedule consisted of nine treatments: control (water spray), GA3 at 50 and 100 ppm, NAA at 50 and 100 ppm, and four combinations of GA3 + NAA. Significant improvements were observed in vegetative growth, flowering and yield attributes under combined PGR application. T₇ (GA₃ @ 100 ppm + NAA @ 100 ppm) recorded the highest plant height at 90 DAT (355.0 cm), number of leaves per plant⁻¹ (40.4), shoot length (42.6 cm), canopy spread (4.0 m), flowers per plant⁻¹ (405.0), fruit set (89.2%), fruits per plant⁻¹ (323.0), average fruit weight (210.0 g) and fruit yield (339.0 q ha⁻¹). This treatment also recorded the earliest flowering (35.2 days). The results indicate that the combined use of GA₃ and NAA, especially at 100 ppm each, may improve the growth and productivity of guava cv. Gwalior-27 in the Gird agro-climatic zone.
Keywords: Guava, Gwalior-27, gibberellic acid (GA₃), naphthalene acetic acid (NAA), plant growth regulators, vegetative growth, flowering, fruit set, yield