Qualitative assessment of black rice under an organic ecosystem of Northeast India

An agronomic investigation was carried out at Instructional-cum-Research Farm of Assam Agricultural University, Jorhat, Assam, during kharif season of 2019-2020 and 2020-2021 to assess the quality parameters of black rice under organic ecosystem of north east 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 a 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 there were no significant results observed in relation to length, breadth, L/B ratio, Brown rice recovery (%), Milled rice recovery (%) and Head rice recovery (%) of grain of black rice. However, the results also showed the significant Protein content (7.96 and 7.98%), with application of RDK through azolla incorporation + mustard oil cake @ 20 kg ha-1) (T6). Amylose content (6.48 and 6.68%), and micronutrient content i.e. Cu (0.54 and 0.59 mg/100 g), Mn (3.72 and 3.75 mg/100 g), Fe (3.42 and 3.57 mg/100 g), and Zn (5.36 and 5.42 mg/100 g). Were found highest with application of RDK through banana pseudo stem vermicompost + mustard oil cake @ 20 kg ha-1) (T8) during 2019-2020 and 2020-2021, respectively.