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A factorial field experiment on wheat crop was conducted during two successive growth seasons of ( 2009/2010 ) ; ( 2010/2011 ) as two different On-farm trials sited in El-Dakahlia Governorate. The factors involved organic manuring from two biological treating composts of rates ( 0, 10 and 20 m 3 .fed -1 ) and NPKZn-mineral fertilization of the optimum recommended rates. The two experimental sites were clayey in texture have the average values of salinity index ECe = 3.8 dS.m -1 ; pH = 7.8 and the available soil forms of N , P , K and Zn nutrients were : 30 , 19 , 600 , 0.6 ; respectively. The obtained results indicated the following points : 1Such soils have to be manured with composts and fertilized with optimum recommended NPKZn-mineral fertilizers for obtaining higher wheat yields. 2Grain and straw yields have been increased significantly as a result of adding organic manuring ( in forms of composts ). Higher wheat yields were realized by applying ( 10 or 20 m 3 .fed -1 ) treatments. 3The biological treated compost realized economically higher values of wheat yield relative to the untreated one. 4The NPKZnmineral fertilization with optimum recommended rates has increased the values of such wheat parameters. 5The significant interaction effects of organic composting and NPKZn-mineral cofertilization indicated that : the highest yield and its component were obtained by applying the treatment of ( bio-treating compost of 10m 3 .fed. -1 ). Along with optimum recommended rates of NPKZn mineral fertilizers.

IMPORTANCE OF ORGANIC MANURING AND MINERAL FERTILIZATION FOR WHEAT YIELD AND ITS COMPONENTS IN EL-DAKAHLIA GOVERNORATE .