Vol. 9, Special Issue 10, Part J (2025)

The present experiment entitled, “Effect of GA3, NAA and Biofertilizers on seedling and root growth of custard apple with economics” was designed with an objective to study the effect of different concentration of PGR and biofertilizers on seedling and root growth of custard apple. The experiment was conducted at the student instructional field and Shed-net House, Department of Horticulture, School of Agricultural Sciences, G. H. Raisoni University Saikheda, Dist.- Pandhurna (M.P.) during Rabi Season of Year 2024. The experiment was laid out in RBD (Randomized Block Design) with 11 treatments including control, the detail of experiment are, T₁- Control, T₂- Gibberellic Acid @ 50%, T₃- Gibberellic Acid @ 75%, T₄- Gibberellic Acid @ 100%, T₅- Naphthalene Acetic Acid @ 50%, T₆- Naphthalene Acetic Acid @ 75%, T₇- Naphthalene Acetic Acid @ 100%, T₈- Azatobactor (5 ml/l of water), T₉- Azatobactor (10 ml/l of water), T₁₀- Azospirillum (5 ml/l of water) and T₁₁- Azospirillum (10 ml/l of water). The observation on seedling growth number of leaves per seedling at 60 DAS, number of leaves per seedling at 90 DAS, root parameters like length of primary roots (cm), length of secondary roots (cm), number of roots per seedling at 60 DAS, fresh weight of root (g) at 60 DAS, dry weight of root (g) 60 DAS, economics gross return (₹), net profit (₹) and            B:C Ratio. The result revealed that the maximum maximum number of leaves per seedling (6.23 at 60 DAS and 10.64 at 90 DAS), the longest primary (25.44 cm) and secondary (8.23 cm) roots, the highest number of roots per seedling (32.22 at 60 DAS), and the greatest fresh and dry root weights (12.21 g and 1.57 g at 60 DAS, respectively). These values were statistically at par with T₆ (NAA @ 75%) and T₃ (GA₃ @ 75 ppm), both of which also exhibited notable improvements over the control while the minimum value of all parameters was found under control.