Effect Of Sewage Wastes On Chemical Properties Of Soil

Abstract

A field, experiment to study the effect of different levels of sludge on some chemical properties of soil., using The Randomized Complete Block Design (RCBD) with three replicates. We used four levels of sludge, which are (0, 40, 60, 80 ton ha^-1) and they symbolized respectively (S0, S1, S2, S3, and S4), respectively, and nitrogen fertilizer used from two nitrogen sources and three levels, namely urea and ammonium sulfate., The two were mixed, cultivated the seeds of yellow corn in hybrid cultivars as botanical evidence. It took soil samples after harvesting for the required analyzes. The results showed a significant increase in the electrical conductivity (EC), values for all levels of sludge addition (0,40,60,80), where the values reached (4.22, 5.28, 5.59, 5.92) dSm ^-1 respectively, while mineral fertilization gave an increase. not significant in electrical conductivity values, There was a decrease in of soil reaction (pH) from (7.55) to (7.30) with an increase in, the levels of addition of sludge, and also there was a significant increase in the concentrations of nutrients in the soil, where the nitrogen concentration increased from (373.1 - 604.2) mg kg^-1Respectively, the component phosphorus increased from (7.6 to 21.2) mg kg^-1respectively, with of a decrease in the concentration of potassium in the soil from (315.7 to 247.5) mg.Kg^-1 with an increase in the levels, of the addition of sludge, the results also show that there was a significant increase in the percentage of organic matter in the soil and for all levels of addition compared with the control treatment, where the increase ranged between (11.3 - 18.7) g kg^-1