الفهرس 
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Abstract
Objectives :The main objectives of the current study is to investigate the rate and the amount of nitrogen mineralization as affected by different sources of organic manures application (compost, chicken manures and town refuse) which mixed with clay and sandy soils at different tow experiment (incubation experiment, and pot experiment) Use of organic fertilizers without soil in experiment storage methods.Methods & Results :1. the best period was 90 days of incubation period the for value content of (NO3- mg kg-1) in clay and sandy soil 2.Compost treatment gave the highest value on total N% during storage.3.Closed (Squeeze) storage method of compost treatment gave the highest value on total N% compared with other methods on all treatments during different period time.4.Level3 (20 t fed-1) of chicken manure treatment gave the highest values of nitrogen of plant compared with other treatments in clay and sandy soil. And town refuse treatment had less effect of nitrogen of plant. Conclusion:It was performed three experiments Faculty of Agriculture, Mansoura University during the 2014/2015 season to study the effect of some of the different types of organic fertilizers (compost - Chicken manure – Town Refuse) in the two types of soils (clay - sandy) soil fertility and mineral nitrogen and racial content of nitrogen and some recipes leaf lettuce growth.