Vol. 12, Issue 7 (2023)

Author(s):
Ashok S Dambale, Jogesh Goswami, KK Sharms, K Kurmi, KN Das and R Das

Abstract:
An agronomic investigation was carried out at Instructional-cum-Research Farm of Assam Agricultural University, Jorhat, Assam, during kharif season of 2019-20 and 2020-21 toassess the growth and yield parameters of black rice under organic ecosystem of northeast India. The topography of experimental field was uniform and fairly levelled. The farm is located at 26° 47’N latitude and 94° 12’E longitudes at an elevation of about 86.6 m above mean sea level. The experiment was laid out in randomized Block Design (RBD) with three replications. The soil of experimental plot was brownish to yellowish brown color with fair drainage and sandy loam in texture with acidic in pH, low in available nitrogen, phosphorous but medium in available potassium. The experimental data recorded during both successive years revealed that the growth, yield attributes and yield of organic black rice was significantly influenced by different K management practices. Among the different growth parameters viz., plant height, leaf area index, no. of leaves, root volume, and dry matter accumulation at different stages were observed to be significantly higher with the application of RDK through banana pseudo stem vermicompost + mustard oil cake @ 20 kg ha^-1 i.e. treatment T₈, while the lowest values were recorded under the control treatment T₁. In case of yield and yield attributing characters like, no. of panicles (m^-2), panicle length (cm), and test weight (g) were found to be superior in respect of almost all the studied parameters under the treatment T₈. The highest no. of panicles (m^-2) 294.10, 305.20, panicle length 27.49 (cm), 28.87 (cm), and test weight 24.48 (g) 24.56 (g), respectively during 2019 and 2020 were also found highest with treatment T₈. The highest grain yield 23.99 q ha^-1, 25.05 q ha^-1 and straw yield 45.02q ha^-1, 47.12 q ha^-1 were registered with the treatment T₈ i.e. RDK through banana pseudo stem vermicompost + mustard oil cake @ 20 kg ha^-1 during 2019-20 and 2020-21, respectively.