Management of potassium in organic black rice under system of rice intensification

Abstract

newline A field experiment entitled Management of potassium in organic black rice newlineunder system of rice intensification was conducted at the organic block, Instructionalcum- newlineResearch Farm of Assam Agricultural University, Jorhat during kharif seasons, 2019 newlineand 2020 to evaluate the effect of different organic inputs on growth, yield, quality and newlineeconomics of organic black rice along with cumulative effects on soil health under the newlinesystem of rice intensification (SRI).The experiment consisted of twelve different newlinetreatments viz.,Control (T1), Potash solubilizing bacteria (KSB) at 3.5 kg ha-1 as root dip newlinetreatment (T2), RDK through azolla incorporation (T3), RDK through water hyacinth newlineincorporation (T4), RDK through banana pseudo stem vermicompost (T5), RDK through newlineazolla incorporation + mustard oil cake at 20 kg ha-1 (T6), RDK through water hyacinth newlineincorporation + mustard oil cake at 20 kg ha-1 (T7), RDK through banana pseudo stem newlinevermicompost + mustard oil cake at 20 kg ha-1 (T8), RDK through azolla incorporation + newlinePotash solubilizing bacteria (KSB) at 3.5 kg ha-1 as rood dip treatment (T9), RDK through newlinewater hyacinth incorporation + Potash solubilizing bacteria (KSB) at 3.5 kg ha-1 (T10), newlineRDK through banana pseudo stem vermicompost + Potash solubilizing bacteria (KSB) at newline3.5 kg ha-1(T11), Indigenous traditional knowledge (T12). The experiment was laid out in a newlineRandomized Block Design (RBD) with three replications. The soil of the experimental site newlinewas sandy loam in texture with pH 5.28, organic carbon (0.72 %), CEC {6.58c mole (p+)/ newlinekg}, low in available nitrogen (246.45 kg ha-1) and available P2O 5 (21.02 kg ha-1) but newlinemedium in available K2O (144.80 kg ha-1). The total rainfall received during the crop newlineseason was 928.2 mm with 43 rainy days in 2019 and 1272.10 mm with 69 rainy days in newline2020. The mean maximum and minimum temperature during the whole crop growing newlineperiod ranged from 30.6 to 21.3°C during 2019 and 32.09 to 24.28 °C during 2020, newlinerespectively....