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International Conference on Reimagining Rainfed Agro-ecosystems: Challenges & Opportunities during 22-24, December 2022 at ICAR-CRIDA, Hyderabad Yin, W., Guo, Y., Hu, F., Fan, Z., Feng, F., Zhao, C. 2018a. Wheat-Maize intercropping with reduced tillage and straw retention: a step towards enhancing economic and environmental benefits in arid areas. Front. Plant Sci. 9:1328. 10.3389/fpls.2018.01328 Zhang, X., Zhao, J., Yang, L., Kamran, M., Xue. X., Dong, Z. 2019. Ridge-furrow mulching system regulates diurnal temperature amplitude and wetting-drying alternation behavior in soil to promote maize growth and water use in a semiarid region. Field Crops Res. 233: 121–130. 10.1016/j.fcr.2019.01.009 Yin, W., Chai, Q., Guo, Y., Fan, Z. L., Hu, F. L., Fan, H. 2020. Straw and plastic management regulate air-soil temperature amplitude and wetting-drying alternation in soil to promote intercrop productivity in arid regions. Field Crops Res. 249:107758. 10.1016/j.fcr.2020.107758 T4a-26P-1059 Effect of Tillage Practices and Nitrogen Fertilizer Levels on Soil Total Carbon, Bulk Density and Porosity in Rainfed Maize-Pigeonpea Crop Rotation under Semi-Arid Tropical Climate A. K. Indoria, K. Sammi Reddy, G. Pratibha, V. K. Singh, S. Kundu, S. S. Balloli, S. Suvana, K. Srinivas, K. L. Sharma and H. Sahu* ICAR-Central Research Institute for Dryland Agriculture, Hyderabad, India *Hemant.Sahu@icar.gov.in Conventional tillage (CT) increases the soil erosion and degradation processes, which causes significant losses in soil carbon content and ultimately promote the deterioration of different soil properties (Indoria et al., 2017). It has been reported that if appropriate soil management technologies such as conservation agriculture is adopted in rainfed areas for the improvement of soil organic content and associated soil physical properties especially bulk density and porosity, the productivity of rainfed crops can be significantly improved (Indoria et al., 2017). At the same time, adequate supply of the mineral nitrogen could be one of the soil management practices in semi-arid tropical climate for improvement of soil environment. Crop response to mineral N involves increase in CO2 fixation and more above and below ground root biomass production.S oil bulk density can affect the seedling emergence, root growth and thus crop production (Blanco Canqui and Ruis, 2018). It can also influence the soil porosity. Therefore, this study was aimed to assess the impact of different tillage practices and Nfertilizer levels on soil total carbon, bulk density and porosity in different soil depths in maize-pigeonpea crop rotation under semi-arid tropical climate. 619 | Page Resource conservation and rainfed agriculture
International Conference on Reimagining Rainfed Agro-ecosystems: Challenges & Opportunities during 22-24, December 2022 at ICAR-CRIDA, Hyderabad Methodology The experimental site was located at Gungal Research Farm (GRF) of ICAR-Central Research Institute for Dryland Agriculture, Hyderabad, Telangana, India. The duration of the experiment was 2012-2018.The treatments comprised of the three tillage practicesviz., conventional tillage (CT), reduced tillage (RT) and conservation agriculture (CA), and four nitrogen levels viz., N0= no nitrogen application (control), N75= 75% of RDN (recommended dose of nitrogen), N100=100% of RDN and N125=125% of RDN of maize and pigeonpea crops on yearly rotation basis. The soil totalcarbon was determined by using the CHNS Analyzer, Vario EL, bulk density was measured by core methodand porosity was calculated by using the formula: Total porosity (%) = (1-bulk density/particle density). Results Effect on soil total carbon content From the view point of soil total carbon content, the order of soil depth was as follows: 0- 7.5>7.5-15>15-30>30-45 cm., irrespective of tillage and nitrogen levels. There were 28.1, 20.1, 15.6 and 2.5% increase in the soil total carbon contentin CA, and 13.9, 9.9, 7.7 and 0.8% increase in soil total carbon contentin RT, in 0-7.5, 7.5-15, 15-30 and 30-45 cm, respectively as compared to the CT. The nitrogen fertilizer levels in relation to the total soil carbon content follow the order: N125>N100>N75>N0 in all the depths studied. There were 13.5, 18.7 and 23.7% increase in soil total carbon contentin 0-7.5cm soil depth,9.4, 16.1 and 20.6% increase insoil total carbon content in 7.5-15 cm, 6.0, 12.7 and 17.4% increase in soil total carbon content in 15-30 cm soil depth and 0.8, 3.0 and 6.4% increase insoil total carbon content in 30-45 cm soil in N75, N100 and N125, respectively. Effect on soil bulk density and soil total porosity 620 | Page Resource conservation and rainfed agriculture
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Extended Summaries 22-24 December,
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Citation Rama Rao, C.A., Srinivasa
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Resilience through land and water m
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International Conference on Reimagi
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Theme- 2 Ecosystem based approaches
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Theme- 6 Institutional and policy i
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