~ 97 ~ International Journal of Research in Agronomy 2024; 7(4): 97-100 E-ISSN: 2618-0618 P-ISSN: 2618-060X © Agronomy www.agronomyjournals.com 2024; 7(4): 97-100 Received: 09-02-2024 Accepted: 16-03-2024 Hrishabh Rai M.Sc. Agronomy, Acharya Narendra Deva University of Agriculture and Technology Kumarganj, Ayodhya, Uttar Pradesh, India Ankur Tripathi Research Scholar, Department of Agronomy, Acharya Narendra Deva University of Agriculture and Technology Kumarganj, Ayodhya, Uttar Pradesh, India Hariom Mishra Subject Matter Specialist, Agronomy, Krishi Vigyan Kendra, Basti, Acharya Narendra Deva University of Agriculture and Technology Kumarganj, Ayodhya, Uttar Pradesh, India Atish Yadav Research Scholar, Department of Agronomy, Acharya Narendra Deva University of Agriculture and Technology Kumarganj, Ayodhya, Uttar Pradesh, India Shivam Kaushik Research Scholar, Department of Agronomy, Acharya Narendra Deva University of Agriculture and Technology Kumarganj, Ayodhya, Uttar Pradesh, India Mayank Singh M.Sc. Scholar, College of Fisheries, Acharya Narendra Deva University of Agriculture and Technology Kumarganj, Ayodhya, Uttar Pradesh, India Rajesh Kumar Associate Professor, Agronomy, Acharya Narendra Deva University of Agriculture and Technology Kumarganj, Ayodhya, Uttar Pradesh, India Corresponding Author: Ankur Tripathi Research Scholar, Department of Agronomy, Acharya Narendra Deva University of Agriculture and Technology Kumarganj, Ayodhya, Uttar Pradesh, India Effect of Plant growth regulators and micro-nutrient on growth and herbage yield of forage sorghum (Sorghum bicolor L.) Hrishabh Rai, Ankur Tripathi, Hariom Mishra, Atish Yadav, Shivam Kaushik, Mayank Singh and Rajesh Kumar DOI: https://doi.org/10.33545/2618060X.2024.v7.i4b.531 Abstract The present investigation entitled “Effect of plant growth regulators and micro-nutrient on growth and herbage yield of forage sorghum (Sorghum bicolor L.)” was carried out during the Kharif season of 2022, at the G.P.B. Research Farm of the Acharya Narendra Deva University of Agriculture and Technology in Kumarganj, Ayodhya (U.P.). The experiment was laid out in randomized block design with twelve treatments viz. Triacontanol 10 ppm at 30 DAS (foliar spray), Salicylic acid 100 ppm at 30 DAS (foliar spray), 5 Kg Zn /ha soil application, 2 Kg B /ha soil application, 5 Kg Zn /ha +2 Kg B /ha soil application, 5 Kg Zn /ha soil application + Triacontanol 10 ppm at 30 DAS foliar spray, 5 Kg Zn soil application + Salicylic acid 100 ppm at 30 DAS foliar spray, 2 Kg B /ha soil application + Triacontanol 10 ppm at 30 DAS foliar spray, 2 Kg B /ha soil application + Salicylic acid 100 ppm at 30 DAS foliar spray, 5 Kg Zn /ha + 2 Kg B /ha soil application + Triacontanol 10 ppm at 30 DAS foliar spray, 5 Kg Zn /ha + 2 Kg B /ha soil application + Salicylic acid 100 ppm at 30 DAS foliar spray and water spray at the time of PGR application. Results revealed that application of 5 Kg Zn /ha + 2 Kg B /ha soil application + Triacontanol 10 ppm at 30 DAS foliar spray was found more effective to enhance the growth and herbage yield of forage sorghum. Keywords: Plant growth regulators, micro-nutrients, forage sorghum Introduction Sorghum (Sorghum bicolor L.) is a C4 cereal fodder crop with excellent photosynthetic productivity. It has beneficial traits like high biomass yield, resistance to salinity, tolerance of a pH range of 5.0 to 8.5, and resistance to drought and poor drainage, among others. The fodder and stover are also used as industrial raw materials for biofuel production, sugar refining, paper production, and feeding animals for milk (Koeppen et al., 2009) [8] . According to Yuan et al. (2008) [15] , it is the fifth most widely farmed cereal in the world and is grown for ethanol production, fodder, sugar, grain, and fibre. Sorghum that has reached the soft dough stage of growth when harvested and kept as silage has a dry matter digestibility of 52 to 65%, 8 to 12% crude protein, 60 to 75% crude fat, 34 to 40% acid detergent fibre and the rest neutral detergent fibre. The digestibility increases as the grain content increases. Grain that has been ensiled is 90% digestible. Plant growth regulators (PGRs) can be applied to produce crops of the necessary quality for fodder, among other uses, in addition to the technological quality that the ethanol sector seeks (Almodares et al., 2013) [1] . PGRs are substances that have the power to alter the morphology and physiology of plants. They can be applied at various times depending on the crop's grower's objectives. The naturally occurring plant hormone salicylic acid functions as a key signaling molecule that increases tolerance to abiotic conditions such as heat, cold, heavy metal toxicity, drought and osmotic stress. It is essential for ion uptake, transport and plant growth. This benefit of salicylic acid may be explained by the stressed plant's improved mineral intake as well as higher CO 2 assimilation and photosynthetic rate. Triacontanol (TRIA) cannot be categorized as a phytohormones because it is a secondary plant growth agent.