Vol. 6, Issue 1 (2018)
Phosphorus fractions and their percentage contribution to total phosphorus in Bt. cotton growing Vertisols of Dharwad district
Author(s): Ramya SH, Hebsur NS, Ravindra VM and Hundekar ST
Abstract: To know the distribution of different fractions of phosphorus in Vertisols under Bt. cotton in Dharwad district ten villages were selected and from each village five farmers were identified and soil samples were collected from 0-30 cm using GPS. Collected samples were analysed for chemical properties and different phosphorus fractions using standard methodology. From the study it was observed that Ca-P was dominant fraction which ranged from 40.40 to 63.56 ppm and contributed about 9.57 to 24.41 per cent to total - P compared to all other phosphorus fractions. Whereas the saloid-P was the smallest fraction, ranged from 1.30 to 3.95 ppm and it contributes about 0.39 to 1.05 per cent to total-P. The dominance of different inorganic fractions of phosphorus in these soils followed the order: Ca-P > Red-P > Al-P > Occl-P > Fe-P > Saloid-P. The correlation study indicated that the Ca-P correlated significantly and positively with pH (r =0.928**), EC (r =0.371**), CaCO3 (r = 0.969**) and total-P (r = 0.586**) only, but the saloid-P had positive and significant correlation with all the P-forms (Al-P, Fe-P, Red-P and total-P and Occl-P), available P and soil organic carbon. Whereas, Al-P was positively correlated with Fe-P (r = 0.551**), Red-P (r = 0.619**), Occl-P (r = 0.761**), total-P (r = 0.345**), available-P (r = 0.577**) and organic carbon (r =0.455**). A Significant and positive correlation of Red-P with saloid-P (r = 0.779**), Al-P (r = 0.619**), Fe-P (r = 0.762**), available-P (r = 0.816**) and Organic carbon (r =0.579**) was observed. Occluded-P had also significant and positive correlation with Saloid-P (r = 0.784**), Al-P (r = 0.761 **), Fe-P (r = 0.749**) and Red-P (r = 0.507**), respectively. The Organic-P was also positively correlated with all the P fractions except Ca-P.
Pages: 1945-1950 | 989 Views 115 Downloads
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How to cite this article:
Ramya SH, Hebsur NS, Ravindra VM, Hundekar ST. Phosphorus fractions and their percentage contribution to total phosphorus in Bt. cotton growing Vertisols of Dharwad district. Int J Chem Stud 2018;6(1):1945-1950.
