Evaluation of N-Carb in Rice Soils
DOI:
https://doi.org/10.17140/phoj-11-741Keywords:
N-Carb, rice, biostimulant, nutrient uptake, grain yield, soil healthAbstract
Soil-based biostimulants are increasingly being evaluated as sustainable inputs for improving soil health,
nutrient-use efficiency, and crop productivity. The present study was conducted to evaluate the effectiveness
of N-Carb, an organic carbon- and nitrogen-based product, in improving growth, yield, nutrient uptake,
and selected physiological indicators of rice. A field experiment was conducted during the kharif season
of 2022 at the ICAR-Indian Institute of Rice Research farm, Hyderabad, using rice variety DRR Dhan 48. The
experiment was laid out in a randomized block design with three replications and four treatments consisting
of recommended dose of fertilizers (RDF) alone and RDF combined with N-Carb applied at different crop
growth stages. N-Carb was applied at a concentration of 6.5 mL L−1 according to the respective treatment
schedules. The initial soil was a slightly alkaline deep black clayey Vertisol with low available nitrogen,
medium available phosphorus, and high available potassium. Application of N-Carb along with RDF generally
improved plant growth, effective tillering, grain yield, and nutrient uptake compared with RDF alone. The
highest grain yield (6.28 t ha−1
) was recorded with three applications of N-Carb at basal, active tillering, and
panicle initiation stages, followed closely by application at basal and active tillering stages (6.26 t ha−1
).
N-Carb application also increased SPAD meter readings and NDVI values and improved post-harvest soil
nitrogen status. The results indicate that N-Carb has potential as a supplementary input for improving rice
growth and productivity when integrated with recommended fertilizer practices.
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