Influence of Plant Growth Regulators, Urea and Micronutrient on Growth, Yield and Quality of Rangpur Lime (Citrus limonia Osbeck)

The present study was conducted at CentralAgricultural University. Pasighat, on influence of the pre-harvest application of NAA and GA₃ combined with 1% urea and 0.5% ZnSO₄ on vegetative growth, fruit drop, yield and fruit quality of Citrus limonia Osbeck, during 2020-2021. The experiment consisted of ten treatments with NAA, GA₃ ZnSO₄ and Urea. The trees sprayed with NAA @ 30 ppm + GA₃ @ 30 ppm + 0.5% ZnSO₄ + 1% urea recorded the maximum plant height, minimum days for flowering, fruit drop percentage, acidity, higher ascorbic acid, total, reducing and non-reducing sugars and fruit juice content. The treatment combination of NAA @ 10 ppm + GA₃ @ 10 ppm + 0.5% ZnSO₄ + 1% urea performed better with respect to stem girth (38.98 cm). The current study revealed that NAA @ 30 ppm + GA₃ @ 30 ppm + 0.5% ZnSO₄ + 1% urea is the best treatment for enhancing plant growth, reproductive and biochemical parameters of fruit.