The phosphorous nutrient index value estimated in the soils along the Yamuna River in Prayagraj falls into the low to medium fertility class. The inorganic forms of phosphorous, namely aluminium bound phosphorous (Al-P), represented 2.15 percent of total-P, resulting in a relatively low proportion, while calcium bound phosphorous (Ca-P), comprised 31.57 percent of total-P. The correlation coefficient (r) between Olsen P and forms of phosphorous saloid P (S-P) was extremely high among all (r = 0.979*) and occluded bound-P (Occl-P) was significantly associated among the inorganic forms (r = 0.767*). This suggests that Occl-P has a significant contribution to the available phosphorous, it is said to be that from the forms of phosphorous Saloid P and Organic P values should be raised and it is recommended that soils with low content of phosphorous are advised to apply organic manures and supplemented by applying of phosphorous fertilizers in the specified crop to increase the levels of P in the soil.
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