A field trail and a laboratory test were conducted to study the effect of different types and rates of fertilizers on soil nitrogen content and nitrogen leaching in sandy regosols. There were twelve treatments and replicated four times. Organic manures such as Poultry Manure (PM), Rice Straw (RS) and Cattle Manure (CM) with control was tested at three levels of chemical fertilizers including control (unfertilized), recommended level (NPK) and half of the recommended level (½ NPK). PM and CM were applied at the rate of 10 tons/ha, but RS was at 5 tons/ha. Combining Poultry manure with chemical fertilizer treatments recorded higher soil nitrogen content and was followed by Cattle manure and chemical fertilizer combinations. But the treatments combining rice straw with chemical fertilizers recorded lowest value than sole chemical fertilizer and half the rate. Among the combinations of organic manures with chemical fertilizer combination with full dose of chemical fertilizer performed well than the half dose. The results revealed that Column contained organic manures with different rate of chemical fertilizer showed lower nitrate leaching than the columns without organic manure. There was no significant effect of type of organic manure on nitrate leaching. From these results it could be suggested that by combining organic manure with chemical fertilizer the nitrate leaching can be reduced.