Vol. 12, Issue 10 (2023)

Author(s):
Gurpreet Singh, Rajendra P Maury, DC Meena, Yogesh Choudhary, Pushplata Singh, Raj Kumar Gourav, MM Sharma and NK Verma

Abstract:
The investigation was carried out to study the effect of 2,4-D, NAA and GA₃ on growth, yield and fruit quality of kinnow (Citrus nobilis Lour x Citrus deliciosa Tenora.)” at Fruit Orchard, Sri Ganganagar (Rajasthan) during 2022-23. The experiment was laid down in Randomized Block Design which consisted 10 treatment combinations viz; Control (T₀), 2, 4 – D @ 15 ppm (T₁), 2, 4 – D @ 20 ppm (T₂),2, 4 – D @ 25 ppm (T₃), NAA @ 150 ppm (T₄), NAA @ 200 ppm (T₅), NAA @ 250 ppm (T₆), GA₃ @ 25 ppm (T₇), GA₃ @ 50 ppm (T₈) and GA₃ @ 75 ppm (T₉) and treatments were replicated three times. The various concentrations of 2, 4-D, NAA and GA₃ had significant effect on various vegetative growth, yield and quality parameters and the maximum height increment (31.71 cm), annual shoot growth (24.41 cm), tree canopy (35.73 cm³), fruit length (7.41 cm), fruit breadth (8.58 cm), highest fruit weight (192.45 g), maximum fruit volume (313.87 cm³), juice content (53.82%), lowest acidity (0.85%) and highest (48.22 mg/100 g) vitamin–C content in fruit juice was recorded in GA₃ @ 50 ppm (T₈) treatment. However, the minimum fruit drop (71.91%) and maximum fruit set(84.80%), fruit retention (28.09%), fruits per plant (587.16), highest fruit yield (91.99 kg/tree and (25.55 t/ha) were recorded in 2, 4-D @ 20 ppm (T₂) treatment. Whereas, inferior results were observed under control (T₀) treatment. The non-significant effects were observed in application of different levels of plant growth regulators on total soluble solids (TSS) percentage.