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International Conference on Reimagining Rainfed Agro-ecosystems: Challenges & Opportunities during 22-24, December 2022 at ICAR-CRIDA, Hyderabad Integrated Approach for Zinc Enrichment in Rainfed Maize P. Nandini 1* , P. Laxminarayana 1 , K. Bhanu Rekha 1 and T. Anjaiah 2 T4-15P-1064 1 Department of Agronomy, 2 Deparment of Soil Science and Agricultural Chemistry, College of Agriculture, Professor Jayashankar Telangana State Agricultural University, Rajendranagar, Hyderabad-500030, Telangana, India * nandu60109@gmail.com Maize (Zea mays L) the ‘Queen of Cereals’ is the third most important cereal crop in the world. Agronomic zinc biofortification in maize is useful to overcome the hidden hunger for Zn (Muhammad and Abdul, 2018). Zinc solubilising bacteria are capable of solubilizing ZnO, ZnCO3 and zinc phosphate through production and excretion of organic acids (Sruthi, 2013). Micronutrients like Zn, Fe, B, Mo etc., are mostly used in polymer coating. Polymers are mostly used in coating of fertilizers for slow release of fertilizer from polymer coated fertilizers (Shahzad et al., 2019). Methodology The experiment was conducted during Kharif, 2019at College Farm (Plot no. B-8, Block-B), College of Agriculture, Rajendranagar, PJTSAU, Hyderabad. The experimental site was located at 17°19' 19.2" N Latitude, 78°24' 39.2” E Longitude at an altitude of 542.3 m above mean sea level and lies under Southern Telangana Zone.Maize hybrid NK-6240 @ 20 kg ha -1 was sown on ridges at spacing of 60 cm × 20 cm. Recommended dose of fertilizer (RDF- 200: 60: 50-N: P2O5: K2O kg ha -1 ) N was applied in three equal splits (at sowing, knee-high and tasseling stage), total P was applied as basal and K was applied in two equal splits (at sowing and tasseling stage). Crop was entirely grown under rainfall which accounted to 680.8 mm. Results Plant height has shown a linear increase at all the stages of crop period. A perusal of data revealed that plant height significantly influenced by integrated approach for zinc enrichment at 30 DAS, knee high stage and at harvest except at 60 DAS. On the whole, significant variation in the plant height with T5 and T7 might be due to rapid cell division and elongation as a result of availability of the needed nutrients to the plant at critical growth stages coupled with application of zinc might have resulted in improvement of metallo enzyme system regulatory function and growth promoting auxin production resulting in increased plant height linearly. Similar results were earlier reported by Hekmatet al. (2019). Sustainable soil management for resilient rainfed agro-ecosystem: conservation agriculture, organic farming, INM, soil-microorganisms-plant interactions 473 | Page
International Conference on Reimagining Rainfed Agro-ecosystems: Challenges & Opportunities during 22-24, December 2022 at ICAR-CRIDA, Hyderabad Number of Leaves Per Plant The number of leaves per plant recorded at 30 DAS, knee high stage, 60 DAS and at harvest. A scrutiny of data revealed that no. of leaves in maize differed significantly due to treatments at all the stages of observation except at 30 DAS.No. of leaves produced by plant at different stages increased linearly from 30 DAS to harvest. At knee high stage, 60 DAS and at harvest, highest number of leaves was recorded with T5 {RDF + FYM enrichment with 50 kg ZnSO4 ha -1 } and was on par with other treatments viz., T2, T4, T7 and T10. The lowest number of leaves was registered with T1 [RDF alone (Control) N: P2O5: K2O - 200:60:50 kg ha -1 ]. From the results it is inferred that number of leaves per plant has shown a gradual increase from seedling to vegetative stage. Similar trend was also observed by Hekmatet al. (2019) and Singh et al. (2016). Conclusion The growth parameters were significantly higher with treatments that consisted of conjunctive Zn application along with organic manures (FYM and inorganic fertilizers), T5 (RDF + FYM enrichment with 50 kg ZnSO4 ha -1 ) and also shown on par results with T7 {RDF + ZSB (1kg/100 kg FYM) + 0.2% Foliar spray of ZnSO4 (Knee-high and Tasseling stages)}. References Hekmat, A.W., Mohammadi, N.K. and Ghosh, G. 2019. Effect of NPK, biofertilizer and zinc foliar nutrition on growth and yield attributes of baby corn (Zea mays L.). In. J. Chemical Stud., 7(4): 2432-2436. Muhammad, A.M. and Abdul, R.B. 2018. Zinc biofortification of maize (Zea mays L.): Status and challenges. Plant Breed., 138:1–28. Shahzad, R., Akbar, S., Jamil, S., Javed, M.A., Jamil, M.W., Fatima, N. and Iqbal, M.Z. 2019. Polymer coating based enhancement of fertilizer use efficiency and growth of wheat crop. Int. J. Biosci.14(2): 562-572. Singh, G., Singh, N. and Kaur, R. 2016. Integrated nutrient management for increasing growth with sustainability of baby corn. Int. J. Bioassays. 5 (2): 4817-4820. Sruthi, P. 2013. Studies on Zinc solubilizing bacteria and their effect on growth and yield of maize (ZeaMaysL.). MSc (Ag) thesis submitted to UAS, Dharwad. 1:72. 474 | Page Sustainable soil management for resilient rainfed agro-ecosystem: conservation agriculture, organic farming, INM, soilmicroorganisms-plant interactions
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Extended Summaries 22-24 December,
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