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Birsa Agricultural University, Ranchi

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19951
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Subject: Soil Science and Agriculture Chemistry × Author: Binod Kumar × End date: 1997 × Start date: 1993 × Type: Thesis ×
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    ThesisItemOpen Access
    Indices of P Availability in Relation to Soil Characteristics of Karaya Series of Santhal Pargana Region
    (Birsa Agricultural University, Ranchi, 1995) Binod Kumar; Dr. B.P. Singh
    A series of laboratory experiments with respect to P status, relationship between different indices of P availability, soil properties and P fixation was carried out in soils of Karaya series of Dumka district of Santhal Parganas. Results indicate that the soils of this series are extremely to slightly acidic in reaction. The soils are of low organic carbon status and are usually sandy clay loam in texture. The available P content of soils range from 1.00 to 44.05 kg ha-1 and are categorized as of low to medium P status. Correlation studies between different indices of phosphorus and soil properties showed that soil pH had positive and significant correlation with Olsen P. In case of P fixing capacity, it showed a negative significant correlation with sand (-0.432) and positive significant correlation with silt content (r= 0.425*). Results further indicate that Al-P. Fe-P, Ca-P and occl.-P are positively and significantly correlated with Bray P₁ and Bray P₂ content. Stepwise multiple regression analysis was also carried out to know the variability of available P due to soil characteristics and different inorganic P fractions. Path coefficient analysis indicates direct and positive effect of saloid-P, Fe-P and occl.-P on available P (Bray P₁). In case of P fixing capacity of soils, it is found that saloid-P. Fe-P and Ca-P exert direct and positive effect on P fixing capacity.