Vertical Distribution of Different Forms of Phosphorus in Alluvial Soils of Gird Region of Madhya Pradesh

Forms of phosphorus and their distribution in eighteen profiles of Alfisols and Inceptisols of Gird region of Madhya Pradesh were studied in relation to soil properties. In both the orders, amount of Olsen-P, Fe-P, AlP, Red-P and total-P decreased with increasing depth, whereas Ca-P was found to be lower in the surface layers and increased with the depth. The Ca-P was observed to be the most predominant P fraction followed by reductant soluble- P, Al-P and Fe-P in soil pH range of 6.8 to 10.1. Olsen-P showed significant positive relationship with organic carbon, CaCO₃ and silt and negative with pH, EC, sand and clay. The Ca-P was found to be positively significantly correlated with all the soil properties except organic carbon and silt. pH and clay showed negative significant relationship with Al-P. The relationship of Fe-P with pH, EC, CaCO₃, sand and clay was found to be negatively significant while organic carbon and silt showed positive significant association. The red-P and total-P showed positive significant correlation with organic carbon, sand and clay, whereas it was negatively significant with CaCO₃. Multiple regression equations were also worked out for predicting different forms of phosphorus in relation to soil properties.