Characterization of Paddy growing soils of Supaul district after Kosi devastation 2008 in Bihar
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Date
2017-07
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Department of Soil Science & Agricultural Chemistry, BAU, Sabour
Abstract
In the present study, characterization of paddy growing soils of Supaul district after Kosi devastation 2008 in Bihar, was done with surface and sub-surface samples, soil constraints and soil site suitability for important paddy crop of pedons 1, 2, 3, 4 and 5. The paddy crop production related constraints were also identified with appropriate land use and management technologies. The soils of the study area as per the criteria of taxonomic classification predominantly come under Entisols.
All the physical and chemical parameters were estimated by following standard procedures. The bulk density of profile 1 to 5 varied from 1.42-1.71 g/cc and the maximum water holding capacity of pedons varied from 24.15-38.48 %. The pH, EC, ESP, CEC, CaCO3, SOC, available N, P2O5, K2O, DTPA-Fe, Mn, Zn, and Cu of surface soil irrespective of profiles varied from 6.46-7.14, 0.08-0.83 dSm-1, 0.42-2.51 %, 4.14-12.10 meq/100g, 1.29-3.70 %, 0.14-0.40 %, 21.48-163.07 kg ha-1, 11.14-47.62 kg ha-1, 85.93-344.06 kg ha-1, 17.19-60.26 mg kg-1, 4.38-20.79 mg kg-1, 0.08-4.75 mg kg-1 and 0.31-6.83 mg kg-1 respectively. The surface and sub-surface samples of paddy growing soils in respect of soil pH varied from 6.25-8.49 and 6.56-8.83, respectively. Similarly, EC in paddy growing soil varies from 0.04-0.46 and 0.04-0.45 dSm-1 respectively. Similarly, ESP in paddy growing soil varied from 0.27-4.89 % and 0.27-4.98%, respectively. Similarly, CaCO3 in paddy growing soils varied from 1.00-6.54 % and 0.78-5.10 %, respectively. The organic carbon of surface and sub-surface samples of paddy growing soil varies from 0.06-0.54 % and 0.06-0.59%, respectively. The available nitrogen of surface and sub-surface samples of paddy growing soil varies from 37.72-175 kg ha⁻1and 33.34-154.7 kg ha⁻1, respectively. The available P2O5 of surface and sub-surface samples of paddy growing soil varies from 6.89-32 kg ha⁻1and 5.95-27.64 kg ha⁻1, respectively. The available K2O of surface and sub-surface samples of paddy growing soil varies from 173.65-282 kg ha⁻1and 151.77-246.46 kg ha⁻1, respectively. The DTPA-Fe, Mn, Zn, Cu and available boron of surface and sub-surface samples of paddy growing soil varies from 12.05-59.65 mg kg-1 and 10.29-50.94 mg kg-1, 7.04-19.25 mg kg-1 and 5.94-16.25 mg kg-1, 0.50-3.38 mg kg-1 and 0.41-2.79 mg kg-1, 1.22-4.82 mg kg-1and 1.21-4.07 mg kg-1, 0.06-1.54 mg kg-1 and 0.05-1.27 mg kg-1, respectively. Considering the soil-site suitability criteria, Supaul (PN1), Triveniganj (PN2), Kishanpur (PN3) and Pratapganj (PN5) were identified as moderate suitable (S2) block and Raghopur (PN4) was categorized in marginal suitable class (S3) for paddy cultivation (local variety), whereas, based on Naidu et al. (2006) and slight modification of local situation, Supaul (PN1), Triveniganj (PN2) and Kishanpur (PN3) and Pratapganj (PN5) were identified as highly suitable (S1) block and the Raghopur (PN4), was categorized in moderate suitable class (S2) for Garma Dhan (Boro rice). From the above facts, it can be concluded that model of Naidu et. al. (2006) with slight modification of location situation, fitted better to NBSSLUP, Nagpur (2000) under different bocks of paddy growing soils in Supaul district.
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