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Micronutrient status and the soil physico- chemical properties affecting their availability in rubber growing areas of the north-east india

By: Contributor(s): Material type: TextTextPublication details: Rubber Science 2013Description: 60-65Subject(s): Summary: Two hundred and ten soils samples were collected from the rubber growing areas of Assam, Meghalaya and Tripura. DTPA extractable cations were estimated and their relations with diffrent physio-chemical properties of the soils were studied. Soils varied from sandy loam to clay loam in texture, extreme to moderately acidic in reaction (pH:3.9 to 6.1) and medium to high organic carbon content (5.50 to 22.50 mg kg-1). Cation exchange capasity of the soil samples ranged from 4.52 to 17.45 cmol (p+) kg-1. DTPA extractable Fe, Mn, Zn and Cu content of the soil samples ranged from 41 to 308 (mean 160.5), 6.1 to 72.0 (mean 29.1), 0.13 to 2.86 (mean 0.84) and 0.50 to 2.46 (mean 1.47) mg kg-1 of soil, respectively. Based on the prescribed critical limit, all the samples were sufficient in DTPA- Fe and Mn. Cu deficiency was observed in 4.11 percent of the total soil samples collected About 29 per cent of the soil samples were deficient in DTPA-Zn. Hill Zone of Assam recorded the highest (33.6;) and Garo Hills of Meghalaya recorded the lowest (21.65;) numbered of Zn-deficient samples. Organic carbon and clay content of the soils were positively and significantly and correlated with the DTPA extractable micronutrients and contributed significant variations towards their availability.
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Two hundred and ten soils samples were collected from the rubber growing areas of Assam, Meghalaya and Tripura. DTPA extractable cations were estimated and their relations with diffrent physio-chemical properties of the soils were studied. Soils varied from sandy loam to clay loam in texture, extreme to moderately acidic in reaction (pH:3.9 to 6.1) and medium to high organic carbon content (5.50 to 22.50 mg kg-1). Cation exchange capasity of the soil samples ranged from 4.52 to 17.45 cmol (p+) kg-1. DTPA extractable Fe, Mn, Zn and Cu content of the soil samples ranged from 41 to 308 (mean 160.5), 6.1 to 72.0 (mean 29.1), 0.13 to 2.86 (mean 0.84) and 0.50 to 2.46 (mean 1.47) mg kg-1 of soil, respectively. Based on the prescribed critical limit, all the samples were sufficient in DTPA- Fe and Mn. Cu deficiency was observed in 4.11 percent of the total soil samples collected About 29 per cent of the soil samples were deficient in DTPA-Zn. Hill Zone of Assam recorded the highest (33.6;) and Garo Hills of Meghalaya recorded the lowest (21.65;) numbered of Zn-deficient samples. Organic carbon and clay content of the soils were positively and significantly and correlated with the DTPA extractable micronutrients and contributed significant variations towards their availability.

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