EFFECT OF SEWAGE SLUDGE ON SOME CHEMICAL PROPERTIES OF SOIL

Field experiment was carried out to study the effect of different levels of Rustumia sewage sludge on some chemical properties of soil. They experiment was conducted at the field of college of agriculture at Abu-Ghraib by using a complete randomized block design in four replicates. Five levels of sewage sludge were used, they were (0,20,40,60,80)T/ha. One level of mineral fertilizer was used (180kg N/ha+180kg P2O5/ha) for comparison. Corn seeds were planted as indicator plant. Soil samples form all treatments were token and they were analyzed for this properties. The results indicated a significant increase in soil salinity under high levels of sewage sludge (60 and 80)T/ha (2,93 and 3.26) dSm(-1) respectively, while the increase was not significant under low levels of sludge and mineral fertilizer treatment. The results showed decrease in the values of soil reaction (7.44 and 7.71), and increase of all cations and anions, except the decrease in the soluble potassium, in paste soil with the increase of sludge levels. the results indicated a significant increase in the percentage of organic matter in soil for all sewage sludge levels in comparison with control treatment (12.7 - 21.3) gm. Kg(-1).