Long-term Fertility Management Effect on Soil Carbon Fractions under Godavari Zone

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  • P V GEETHA SIREESHA Department of Soil Science and Agricultural Chemistry, Agriculture College, ANGRAU, Mahanandi - 518 502, Andhra Pradesh, India
  • G PADMAJA Department of Soil Science and Agricultural Chemistry, College of Agriculture, PJTSAU, Rajendranagar, Hyderabad - 500 030, Telangana, India
  • P C RAO Department of Soil Science and Agricultural Chemistry, College of Agriculture, PJTSAU, Rajendranagar, Hyderabad - 500 030, Telangana, India
  • CH SREENIVAS Andhra Pradesh Rice Research Institute & Regional Agricultural Station, ANGRAU, Maruteru, West Godavari - 534 122, Andhra Pradesh, India



Carbon stocks, Godavari Zone, Mineralizable carbon, Rice-rice cropping system, Soil organic and inorganic carbon, Soil microbial biomass carbon


Long-term fertilizer experiments provide the best possible means of studying changes in soil properties and processes for identifying the emerging needs in nutrient imbalances and deficiencies to formulate future strategies for maintaining soil health. A long-term experiment was conducted in Godavari Alluvials at Andhra Pradesh Rice Research Institute, Maruteru in Andhra Pradesh located at 81º44′ E longitude, 16º37′ N latitude and 5 m above mean sea level. The highest organic carbon content (1.70%) was noticed in the treatment receiving 50% recommended dose of fertilizers (RDF) of NPK + 50% N through FYM (T6) followed by T3 (FYM @ 10 t ha-1) and T5 (50% RDF of NPK + 50% N through green leaf manure (Calotropis spp.) with 1.69 and 1.65% of OC, respectively. All the treatments showed higher organic carbon content (recorded in 2016) than the initial value (0.55%) which was recorded at the initiation of the experiment in 1989. Similar trends were observed in rabi with soil organic carbon content varying from 0.53 to 1.88%. The highest SMBC (523.7 mg kg-1) was observed in T4 (100% RDF of NPK + FYM @ 5 t ha-1) followed by T6, T7, T5 and T8 treatments with microbial biomass carbon content of 482.6, 476.2, 434.8 and 413.4 mg kg-1, respectively. The highest mineralizable carbon (1218 mg CO2-C kg-1) was recorded in T4 (100% RDF of NPK + FYM @ 5 t ha-1). These results suggest that long-term application of organic manures alone or in combination with RDF has resulted in the buildup of soil organic carbon content even under tropical climates. The soils were rich in clay content (Godavari Zone) and there was relatively higher soil organic carbon content. Further, the addition of organic manures improved the macro aggregates and carbon storage inside the aggregates which was protected from decomposition.


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How to Cite

GEETHA SIREESHA, P. V., PADMAJA, G., RAO, P. C. ., & SREENIVAS, C. . (2024). Long-term Fertility Management Effect on Soil Carbon Fractions under Godavari Zone. Journal of the Indian Society of Coastal Agricultural Research, 41(2), 28-35. https://doi.org/10.54894/JISCAR.41.2.2023.135504