Vol. 11, Issue 11 (2022)

Field experiment was conducted during kharif, 2021 at Instructional Farm, Department of Agronomy, College of Agriculture, Dapoli, Ratnagiri, Maharashtra in lateritic soils of Konkan to study the effect of humic acid based bio-stimulant on growth, yield and yield attributing characters of kharif rice. The treatments comprise of various levels of bio-stimulant viz., 0, 2.5, 5, 10, 15, 20 kg ha^-1 and tricontanol @ 25 kg ha^-1 along with RDF which are applied on rice under transplanted condition. Significantly positive effects and higher values were observed on plant height, number of tillers hill^-1, number of functional leaves hill^-1 and dry matter production at 60 DAT (Days after transplanting) and 90 DAT of rice crop with the application of bio- stimulant @ 20.0 kg ha^-1 (T₅) whereas, least values were recorded with untreated control or RDF only (100: 50: 50 NPK kg ha^-1) treatment. Significantly higher grain yield (4753.33 kg ha^-1) and straw yield (6156.63 kg ha^-1) were observed when bio-stimulant @ 20.0 kg ha^-1 (T₅) was applied over other treatments and lower grain and straw yields were observed with respect untreated T₇ (applied RDF only) treatment.