National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
Twenty soil samples were collected from various paddy fields of Imphal west district, Manipur to evaluate status and forms of zinc in the soils. All the soil samples were acidic in nature with mean value of pH 5.52. The mean electrical conductivity was 0.09 dSm-1 and the mean organic carbon content was 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 mean value of 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. The distribution of zinc in the soil was in the order: WSEX-Zn (0.40 mg kg-1) < CRYOX-Zn (1.35 mg kg-1) < MnOX-Zn (1.97 mgkg-1) < AMOX-Zn (3.10 mg kg-1) < OCx-Zn (3.22 mg kg-1) < Res-Zn (85.90 mg kg-1). All the zinc fractions showed positive correlation with EC, OC, CEC, available nitrogen, available potassium, clay and negative correlation with pH, available phosphorus and silt. The WSEX-Zn form showed the highest correlation with all the plant parameters and per cent contributions of this fraction was highest towards all the plant parameters. Application of zinc increases the total dry matter, zinc content in plant and zinc uptake by the plant. The critical limit of zinc in the soils was 0.69 mg kg-1 and the critical concentration of zinc in 50 days old pea plant tissue was 0.21 per cent.
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