~ 467 ~ International Journal of Chemical Studies 2021; 9(2): 467-470 P-ISSN: 2349–8528 E-ISSN: 2321–4902 www.chemijournal.com IJCS 2021; 9(2): 467-470 © 2021 IJCS Received: 08-12-2020 Accepted: 19-02-2021 Vipul Pratap Singh Department of Vegetable Science, Kalyanpur Chandra Shekhar Azad University of Agriculture & Technology Kanpur, Uttar Pradesh, India DP Singh Department of Vegetable Science, Kalyanpur Chandra Shekhar Azad University of Agriculture & Technology Kanpur, Uttar Pradesh, India Bankey Lal Department of Vegetable Science, Kalyanpur Chandra Shekhar Azad University of Agriculture & Technology Kanpur, Uttar Pradesh, India Mahendra Kumar Yadav Department of Vegetable Science, Kalyanpur Chandra Shekhar Azad University of Agriculture & Technology Kanpur, Uttar Pradesh, India Satyendra Kumar Department of Vegetable Science Kalyanpur Chandra Shekhar Azad University of Agriculture & Technology Kanpur Uttar Pradesh, India Corresponding Author: Vipul Pratap Singh Department of Vegetable Science, Kalyanpur Chandra Shekhar Azad University of Agriculture & Technology Kanpur, Uttar Pradesh, India Effect of micronutrients and PGR on growth and yield of tomato ( Solanum lycopersicum L.) Variety Azad-T 6 Vipul Pratap Singh, DP Singh, Bankey Lal, Mahendra Kumar Yadav and Satyendra Kumar DOI: https://doi.org/10.22271/chemi.2021.v9.i2g.11864 Abstract The present investigation entitled “Effect of micronutrients and PGR on growth and yield of tomato (Solanum lycopersicum L.) Variety Azad-T6” was carried out during the rabi season 2018-19 and 2019- 20 both the year same time at Department of Vegetable Science Kalyanpur Chandra Shekhar Azad University of Agriculture & Technology Kanpur U.P (208024) India. Experiment was laid out in randomized block design (RBD) with eleven treatments in replicated three times consist of two levels of each micronutrients and growth regulators with control i.e. T0: Control, T1: GA3 50ppm, T2: GA3 100ppm, T3: NAA 50ppm, T4: NAA 100ppm, T5: ZnSO4 0.5%, T6: ZnSO4 1%, T7: Boric acid 50ppm, T8: Boric acid 100ppm, T9: FeSO4 100ppm and T10: FeSO4 150ppm. Significantly differences were found for plant growth and yield parameters. The highest plant height (cm), number of branches plant -1 , number of flower cluster -1 and number of cluster plant -1 was recorded in T2: GA3 100ppm. The application of T2: GA3 100ppm was found early days to 50%flowering, days to first fruit set, no. of fruit per cluster, no. of fruit plant -1 , average fruit weight (g), fruit length (cm), fruit width (cm), fruit yield plant -1 (kg), fruit yield plot -1 (kg) and fruit yield (q ha -1 ). Revealed that the use of GA3 concentration of 100ppm, considerably increased the vegetative growth and yield parameters and significantly increased growth and yield parameters. Keywords: Micronutrients, PGR, growth, yield, azad-T6 and tomato Introduction Tomato (Solanum lycopersicum L.) is an important vegetable of a solanaceous family having chromosome number 2n=2x=24. It has originated from wild form in the Peru-Equador-Bolivia region of the Andes, South America (Rick, 1969) [9] and grown in every country of the world (Roberston and Labate, 2007) [10] . For making the tomato pickles the unripe green fruit are used, preserve are consumed after cooking as vegetables (Kaur et al., 2004). The prime tomato producing countries of the earth are China, United States of America, India, Egypt, Turkey, Iran, Mexico, Brazil and Indonesia (FAO, 2019). In India, at present the total area under tomato cultivation is 778 thousand hectare and production is 19397 thousand MT (NHB, 2019). Considerable investigation work has been done on the different aspect of foliar spray of micronutrient in various crops and the research results specified not only an increase in yield up to 20 per cent but also helpful way to sustain crop production. Arora et al. (1979) reported that micronutrients like zinc, boron, and iron through foliage application can improve the plant growth parameters, fruit set and fruit yield of tomato (Salisbury and Rose, 1986) and (Halfare and Barden, 1979). Boron is necessary for cell division, germination of pollen, movement of sugars through protoplasmic membranes, development of phloem and transport of certain hormones (Edmond et al., 1995). Zinc is a component of enzyme and necessary for chlorophyll formation and function in synthesis of auxins (Thompson and Kelly, 1972) and (Halfare and Barden, 1979). In some countries, tomatoes are commercially growing even at high temperature through application of plant growth regulators (PGRs). Gemici et al., 2006 [3] reported that application of auxin and gibberellins are effective in increasing both fruit yield and quality of tomato. Application of certain PGRs like gibberellic acid (GA3) bring the possibility of tomato production under adverse environmental region. Those PGRs are used extensively in tomato to enhance yield by improving fruit set, size and number of fruits