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Abstract - El-Arish, North Sinai. The main object of this research was to study the effect of two organic manure fertilizers (Chicken manure”ChM”; Compost ”CoM”), two Antioxidants (Ascorbic acid ”AA” Citric acid ”CA”), and natural yeast extract on growth and yield of tomato plants (tomato hybrid ”GS 12”). Treatments were randomly arranged in a split -plot design, wherein organic manures were randomly arranged in the main plots and antioxidants as well as yeast beside control treatm A field experiment was carried out during summer seasons of 2007 and 2008 at The Experimental Research Station of The Agriculture Research Center ent were randomly distributed in the sub plots with four replicates. in a completely randomized Plock design. Plants were grown in the summer season under sandy loamy soil conditions using drip-irrigation system. The obtained results could be summarized as follows: |