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International Conference on Reimagining Rainfed Agro-ecosystems: Challenges & Opportunities during 22-24, December 2022 at ICAR-CRIDA, Hyderabad T4a-07R-1015 Effect of Conservation Agriculture and Mineral Nitrogen Levels on Soil Aggregate Stability Indices and Associated Carbon in Rainfed Maize (Zea mays L.) - Pigeonpea (Cajanus cajan (L.) Millsp.) Crop Rotation under Alfisols A. K. Indoria 1* , K. Sammi Reddy 1 , G. Pratibha 1 , V. K. Singh 1 , D. S. Kumar 2 , S. Kundu 1 , S. S. Balloli 1 , K. Srinivas 1 , K. L. Sharma 1 , M. Prabhakar 1 , Ch. Srinivasarao 3 , V. Visha Kumari 1 , S. Sukumaran 1 , V. N. Mishra 2 and H. Sahu 1 1 ICAR-Central Research Institute for Dryland Agriculture, Hyderabad, India 2 Indira Gandhi Krishi Vishwavidyalaya, Raipur, India 3 ICAR- National Academy of Agricultural Research Management, Hyderabad, India * ashok.indoria@icar.gov.in Intensive tillage directly affects the stability and formation of soil aggregates by disrupting soil structure. Its intensity deteriorates and weakens soil aggregates, making them susceptible to decay. Conservation agriculture as a soil management technology has been suggested by many researchers to minimise the negative impact of conventional tillage practices on soil aggregate functioning (Indoria et. al., 2017). Soil aggregates are considered as the pockets to provide physical protection to soil carbon and significantly affect the diffusion rate of oxygen, nutrient adsorption, soil water retention, microbial community and root growth (Indoria et. al., 2017). This study was aimed to assess the impact of conservation agriculture practices and different levels of mineral N on soil aggregate stability indices and associated carbon in maize-pigeonpea crop rotation under Alfisols. Methodology A long-term field experiment was established at Gunegal Research Farm of ICAR-CRIDA, Hyderabad in 2012. Treatments includes three tillage practices viz., CT (conventional tillage), RT (reduced tillage) and NT (no-tillage), and four nitrogen levels viz., N-0= no nitrogen application (control). N-75= 75% of RDN (recommended dose of nitrogen), N- 100=100% of RDN and N-125=125% of RDN of maize and pigeonpea crops on yearly rotation basis. Soil samples were collected during 2018 (after seven years) from 0-7.5, 7.5-15 and 15-30 cm soil depths. The aggregate size distribution of soil was determined by wet sieving method using Yoder type apparatus. The C associated with different aggregate size fractions was determined by using the CHNS Analyzer, Vario EL. Resource conservation and rainfed agriculture 580 | Page
International Conference on Reimagining Rainfed Agro-ecosystems: Challenges & Opportunities during 22-24, December 2022 at ICAR-CRIDA, Hyderabad Results Tillage practices and mineral nitrogen levels significantly influenced the aggregate stability indices. Significantly higher mean weight diameter (MWD) of soil aggregates recorded in the NT (35%) and RT (25%) as compared to the CT in 0-7.5 cm soil depth. Similarly, significantly higher MWD were recorded under N-125 as compared to the other N levels (Fig 1 A). A similar trend was observed in 7.5-15 and 15-30 cm soil depth with respect to the MWD. About 70% higher aggregate ratio (AR) was observed in NT, and about 33% higher AR was observed under RT as compared to the CT. Similarly, nitrogen treatment follows the order: N-0< N-750.5-0.25>0.25-0.106>1-0.5>2-1>4.75-2 mm>silt+clay at all the soil depths, irrespective of tillage and nitrogen levels. The order of aggregate and silt+clay associated C content follows: NT>RT>CT, while in case of N levels, it follows: N-125 >N-100>N-75>N-0. In NT and RT, the C stocks in different macroaggregates (4.75-2, 2-1, 1-0.5 and 0.5-0.25 mm) increased, while these decreased in microaggregates (0.25-0.106 and 0.106-0.053 mm). Effect of different tillage practices and mineral nitrogen levels on A) MWD (mm) and water stable aggregates (%) in 0-7.5 cm soil depth. 581 | 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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