Author(s):

Nalla Sanjuna Reddy, WP Badole, Megha B Nirgulkar and Jakku Prasanna

Abstract: The present study on impact of organic, inorganic and INM practices on carbon pool and yield of perennial, annual and seasonal crops was studied during 2019-20. The total four villages were selected for study and their GPS location were recorded. The surface (0-15 cm) and sub-surface (15-30 cm) soil samples from each field were collected after harvest of Nagpur mandarin, Pigeonpea and Paddy. The total of 72 (surface and subsurface) samples were collected. The results revealed that, the highest very labile carbon was recorded 1.30 gkg^-1 (surface) and 1.27 gkg^-1 (subsurface), labile carbon 1.02 gkg^-1 (surface) and 0.98 gkg^-1 (subsurface), less labile carbon 0.91 g kg^-1 (surface) and 0.89 gkg^-1 (subsurface) under the regular addition of organic fertilizers like FYM in case of Nagpur mandarin and non-labile carbon was recorded 5.97 gkg^-1 (surface) and 5.82 gkg^-1 (subsurface) under the use of inorganic fertilizers. The lower values of C_VL were recorded 0.77 gkg^-1 (surface) and 0.74 gkg^-1 (subsurface), C_L was recorded 0.55 gkg^-1 (surface) and 0.48 g kg^-1 (subsurface), C_LL was registered 0. 41 gkg^-1 (surface) and 0.37 gkg^-1 (subsurface) where fertilizers applied through inorganic sources. It was observed that the non-labile carbon was lowest 3.73 gkg^-1 (surface) and 3.52 g kg^-1 (subsurface) under integrated nutrient management practices. Active pools are highest in organic and INM practices and passive pool is found abundant where inorganic sources were used. There existed a significant correlation between carbon fractions and yield of crops grown under organic and INM practices, but showed no significant correlation with carbon fractions and yield of crops grown under inorganic farming. Under conventional management, the agronomic relevance of SOM with regard to nutrient supply is much lower than under organic.

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