National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692 Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
Effect of nutrient management modules on nitrogen (N) dynamics in sugarcane grown on a Calcareous entisol was studied during 2018-19. The experiment comprised of different levels of NPK fertilizers alone and in combination with Biocompost, Neem Cake Powder, Trichoderma inoculated trash and Rhizobium inoculated green gram applied at two different crop growth stage (Planting and Earthing Up) was laid out in RBD with three replications. Application of 25% N as inorganic fertilizer + 75% N through organics (Biocompost at planting and Neem cake at earthing up stage split equally) + Azotobacter and PSB significantly increased the organic N fractions viz., hydrolysable NH4+-N (108.3 mg kg-1), amino acid-N (111.2 mg kg-1), Hexoseamine-N (36 mg kg-1) and Unidentified-N (83.9 mg kg-1). The mineral N (NO3--N + exchangeable NH4+-N) content (105.6 mg kg-1) was significantly increased with the application of 50% N as inorganic fertilizer + 50% N through organics (Biocompost at planting and Neem cake at earthing up stage split equally) + Azotobacter and PSB. The highest contribution of inorganic was 17.65% in treatment receiving 50:50 ratio of inorganic and organic sources of nutrients whereas organic N fractions contribution to total N was highest in treatment receiving 25:75 ratio of inorganic and organic sources of nutrients and comparatively lower contribution of these fractions was recorded in control treatment. The mineralizable N was significantly correlated with all fractions of N, except with hydrolysable unidentified-N and non-hydrolysable N.
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