Author(s):

Indira Sarangthem, L Devarishi Sharma, Nivedita Oinam and L Punilkumar

Abstract: An experiment to study the distribution of zinc in some valley soils of Manipur was conducted during rabi season of 2016-17. Twenty soil samples were collected from different paddy fields of Manipur. All the soil samples were acidic in nature with mean value of pH 5.52. The mean electrical conductivity was 0.09 dSm^-1. There was wide variation of organic carbon content with a mean value of 10.82 g kg^-1. The mean cation exchange capacity, available nitrogen, available phosphorus and available potassium were 18.0 [Cmol (p⁺)kg^-1], 303.98 kg ha^-1, 28.68 kg ha^-1 and 231.06 kg ha^-1, respectively. The studied soils were clay in texture. The mean value of available (DTPA extractable) zinc was 0.91 mg kg^-1. The DTPA extractable zinc show positive and significant correlation with EC, OC, CEC, available nitrogen, available potassium, silt and clay. A negative and significant correlation was observed with pH, available phosphorus and sand. Sequential extraction scheme was used to fractionate zinc into water soluble + exchangeable (WSEX), organically complexed (OC), amorphous sesquioxide bound (AMOX), crystalline sesquioxide bound (CRYOX), manganese oxide bound (MnOX) and residual zinc (Res-Zn). The distribution of zinc in the soil on the basis of average concentration was in the order: WSEX-Zn (0.40 mg kg^-1) < CRYOX-Zn (1.35 mg kg^-1)

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