International Journal of Environment and Climate Change

Aims: The study was conducted to evaluate the effect of organic and liquid manures on the productivity, quality and nutrient response of organic blackgram.

Study Design: The experiments were laid out in split plot design with three replications, where the main plot consisting of four treatments and subplot of five treatments.

Place and Duration of Study: The study was conducted in Agricultural Research station, Bhavanisagar and Wetland farms, Coimbatore, TNAU, Tamil Nadu during kharif, 2022.

Methodology: Four organic manures were applied as basal and incorporated (Farm Yard Manure (FYM) @12.5 t ha^-1, Vermicompost @ 2.5 t ha^-1, Enriched FYM @ 0.75 t ha^-1 and Enriched vermicompost @ 1 t ha^-1) and sub plot consisting of foliar sprays applied twice at 1^st flowering and 10 days after first spray (Panchagavya @ 3%, Fermented Egg Extract @ 5%, Fermented Fish Extract @ 5%, Farmers Effective Microorganisms @ 5% and Jeevamruth @ 5%).

Results: At Bhavanisagar, the combination of enriched FYM with Panchagavya spray and at Coimbatore vermicompost with Panchagavya spray recorded highest grain nitrogen (3.67 & 3.63%) grain protein (22.9 & 22.7%), nitrogen uptake (43.1 & 39.9 kg ha^-1), phosphorous uptake (11.2 & 10.2 kg ha^-1) potassium uptake (59.0 & 55.3 kg ha^-1), Nutrient Use Efficiency (NUE) (1.213 & 1.033 kg kg^-1), Partial Factor Productivity (PFP) (31.50 and 26.83 kg kg^-1), respectively. In contrast, the Economic NUE (ENUE) was recorded by the combination of enriched FYM with Jeevamruth spray (0.234 and 0.202 kg ₹^-1), respectively in both the locations.

Conclusion: The study concludes that for higher grain quality and nutrient response, application of enriched FYM or vermicompost as basal and foliar spray of Panchagavya is recommended under extensive organic conditions for Blackgram depending on the resource availability.