RÉSUMÉ
The field experiment was conducted during the kharif season under the AICRP on Long-Term Fertilizer Experiment at the Research Farm, Department of Soil Science and Agricultural Chemistry, JNKVV, Jabalpur (M.P.), India. The investigation was carried out to assess the distribution of P fractions in Vertisol after the harvesting of the soybean crop. Eight treatments were imposed with four replications in a simple randomized block design. The treatments were applied in combination with different doses of fertilizer viz., T1 (50% NPK), T2 (100% NPK), T3 (150% NPK), T4 (100% N), T5 (100% NP), T6 (100% NPK+FYM), T7 (100% NPK-S), and T8 (control). Through the findings, the soil pH and electrical conductivity (dS m-1) did not show significant changes even after the long-term application of various fertilizer levels compared to their initial values. The treatment with 100% NPK + FYM exhibited the highest organic carbon (g kg-1) content and available N, P, and K (kg ha-1) content over the control. The various forms of phosphorus in the soil were observed in the following order: Ca-P > Fe-P > Al-P > Occluded-P > Saloid-P . The Ca-P content was highest when 100% NPK fertilizer and farmyard manure (FYM) were used together. The analysis showed that the presence of saloid-P significantly influences the availability of phosphorus in Vertisol soil. Based on the current investigation, it is recommended to use integrated nutrient management, which includes both 100% NPK fertilizer and FYM, to prevent phosphorus deficiency in soybean cultivation in Vertisol.
RÉSUMÉ
Biosolids are the product of wastewater or municipal solid waste collected through sewerage treatment; theprocesses of obtaining the biosolids involve various treatment processes, which include digestion, thermalstabilization, thickening, dewatering, and drying, in order to obtain free pathogen granules. These processesundergone by wastewater in the treatment plant ultimately clean the wastewater and remove the solids whichare further treated to an acceptable standard for beneficial soil amendments. The application of biosolids areconsidered to improve soil organic matter, moisture content, and provided essential nutrients, such as nitrogenand phosphorus in arable land as potential plant nutrients supplements for crop optimum yield. Incubationstudies on the biosolids-amended soils have shown significant increases in soil phosphorus content beingreleased as plant available P in the soil, and therefore could be a good source of phosphorus in deficientnative phosphorus soil. Field-scale experiments on wheat are grown with sewage sludge have also shown yieldproduction comparable to mineral fertilizer-treated soils. This review is thereby aimed at explaining the conceptbehind the mineralization and mobilization of biosolids phosphorus in soil. In this review paper, an overviewof the method of preparations, origin, and sources, its application in agriculture and the environment, chemicalcomposition, the environmental risk, soil amendments potentials of the biosolid sand regulatory, and globalperspective of sewage sludge disposal all are reviewed. From the review, it was concluded that mineralizationand mobilization of biosolids phosphorus in soil have beneficial input to both environment and soil nutrientamendment. It is thereby recommended that more research studies should be carried out on the mineralizationand mobilization of another essential element, such as nitrogen and biochar although more research should bedone with respect to mineralization and mobilization of biosolids phosphorus in soil.