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International Conference on Reimagining Rainfed Agro-ecosystems: Challenges & Opportunities during 22-24, December 2022 at ICAR-CRIDA, Hyderabad Results Among the various sequences, soybean equivalent yield of maize–chickpea cropping sequence was the highest (4153 q/ha), followed by maize-mustard (3293 q/ha) and maize–safflower sequence (3222 q/ha). Existing soybean-chickpea sequence recorded soybean equivalent yield of 2586 t/ha, which is 60.60% lesser than maize-chickpea cropping sequence. The maizechickpea cropping sequence also recorded the maximum net returns (Rs. 146890/ha) and B:C ratio (4.67) followed by maize-mustard (Rs.1,48,200/ha Rs.1,08,200/ha and 3.71, respectively) and maize–safflower sequence (Rs.1,44,990/ha Rs.1,04,990/ha and 3.62, respectively. While the, highest land use efficiency (98.63%) was noticed with maize-mustard followed by blackgram-mustard sequence. This might be due to increase in the yield of maize and chickpea under maize-chickpea cropping sequence resulting increase the returns over other cropping sequences. Higher system profitability may be attributed to higher productivity of maize than other kharif crops and lower duration of the crops in sequence. Similar findings were also reported by Prajapat et al. (2015) and Singh et al. (2019). Soybean equivalent yield (SEY), economics and various efficiencies as affected by Cropping sequence cropping sequences (Mean data of 3 years) SEY (kg/ha) Net returns of system (Rs. /ha) B:C ratio Total duration (days) Land use efficiency (%) Relative Production efficiency (%) T 1-Soybean- chickpea 2586 76370 2.91 230 63.01 - T 2-Soybean- safflower 1606 32250 1.81 273 74.79 -37.91 T 3-Soybean- mustard 1783 40220 2.01 259 70.96 -31.06 T 4-Maize-chickpea 4153 146890 4.67 230 63.01 60.60 T 5-Maize- safflower 3222 104990 3.62 273 74.79 24.59 T 6-Maize- mustard 3293 108200 3.71 372 98.63 27.35 T 7-Blackgram-chickpea 2314 64125 2.60 205 56.16 -10.52 T 8-Blackgram - safflower 1481 26650 1.67 248 67.95 -42.73 T 9-Blackgram - mustard 1444 24995 1.62 347 95.07 -44.15 SEm+ 58 1678 0.07 - - - LSD (P=0.05) 168 4833 0.20 - - - References Singh, D.K., Singh, R., Singh, G.D., Singh, A.P., Chaturdevi, S., Singh, J.P., Rathi, A. and Singh, M. 2019. Diversification of rice (Oryza sativa)-wheat (Triticum aestivum) system and its influence on productivity, profitability and energetics under on-farm situation. Indian J. Agron., 62 (3): 255-259. 339 | Page Managing genetic resources for enhanced stress tolerance
International Conference on Reimagining Rainfed Agro-ecosystems: Challenges & Opportunities during 22-24, December 2022 at ICAR-CRIDA, Hyderabad Prajapat, K., Vyas, A.K. and Dhar, S. 2015. Effect of cropping systems and nutrient management practices on growth, productivity, economics and nutrient uptake of soybean (Glycine max). Indian J. Agric. Sci., 85(9): 1138-1143. Managing genetic resources for enhanced stress tolerance T3-04O-1123 Samrat Bt – A New, Early Maturing Bt Cotton Variety for Stress Resilience and Multiple Cropping in Rainfed Agro-Ecologies of South India H. B. Santosh *1,4 , S. Manickam 1 , S. B. Singh 1 , V. N. Waghmare 1 , K. P. Raghavendra 1 , Vivek Shah 1 , K. R. Kranthi 2 , Kunal Gaikwad 1 , S. S. Patil 3 , G. Ravindra Chary 4 and V.K. Singh 4 1 ICAR – Central Institute for Cotton Research, Nagpur 440010, Maharashtra 2 International Cotton Advisory Committee, Washington DC 20006-1635, USA 3 University of Agricultural Sciences, Dharwad 580005, Karnataka 4 ICAR-Central Research Institute on Dryland Agriculture, Hyderabad 500059 * hb.santosh@icar.gov.in Bt cotton was developed as an alternate strategy to the previously used hazardous insecticides to circumvent bollworm problem. Though majority of cotton production in India comes from Bt cotton, the cotton productivity in India is low compared to world average (>750 kg/hectare) and is found stagnated at around 500 kg lint per hectare for past many years (Kranthi and Stone, 2020). One of the reasons attributed to this productivity stagnation is deployment of Bt technology in the form of Bt hybrids in rainfed conditions which accounts to more than 60% of cotton area in India. Majority of the popular Bt hybrids are long duration that suffer moisture stress at boll formation stage due to poor water retention of shallow soils in rainfed regions. Productivity enhancement in India can come from yield improvement in rainfed ecosystems through development and deployment of Bt cotton varieties (Singh et al., 2021). Additionally, to address the menace of Pink bollworm and also to enable farmers taking multiple crops, we embarked upon development of early maturing Bt cotton varieties for rainfed agro-ecologies of India. Methodology An F 2 population of the 4 parental cross [(Bikaneri Narma Bt × RCRSC7) × (RCRSC2 × RCRSC12)] was phenotyped for traits of interest like crop maturity, plant architecture, jassid tolerance, yield and fibre quality attributes at ICAR-CICR, Nagpur during Kharif, 2013-14. The promising plants were selected, advanced and stabilized through pedigree breeding during 2014-15 to 2017-18. The presence of Bt gene (cry1Ac) and transgenic event (Mon531) was confirmed through ELISA and event specific PCR. The homozygosity of the transgene was confirmed through zygosity PCR. The rapid generation advancement was achieved by taking off-season crop at CICR Regional Station, Coimbatore, Tamil Nadu. The most promising 340 | Page
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Extended Summaries 22-24 December,
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Resilience through land and water m
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Theme- 2 Ecosystem based approaches
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