Soil Physical and chemical properties, Soil amendment, nitrogen and phosphorus, pH, EC, Organic carbon, Pd and pore space – chemical properties of maize (Zea mays L.)” at the research farm of department of soil sciences, Sam Higginbottom Institute of Agriculture, Technology & Science, Allahabad, The experiment was laid out in randomized block design with three levels of Nitrogen (0 kg ha^-1, 100 kg ha^-1, 120 kg ha^-1) and three levels of Phosphorous (0 kg ha^-1, 80 kg ha^-1 and 100 kg ha^-1). The treatments combinations were replicated three times and were allocated at random in each replication. The treatment combination T₈ [120 Kg N+ 100 kg P] gave the best result with the respect to Combined use of nitrogen and phosphorus resulted in significant increase on enrichment of soil available nitrogen, phosphorus, potassium, soil pH, Soil EC, soil OC, particle density, pore space and water capacity.