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Abstract A field experiment was carried out during summer seasons of 2007 and 2008 at The Experimental Research Station of The Agriculture Research Center, El-Arish, North Sinai. The main object of this research was to study two organic, (chicken manure”ChM”, compost ”CoM”), two antioxidants (ascorbic acid ”AA”, citric acid ”CA”), and natural yeast on growth and yield of tomato plants (GS 12). The highest total early yield was recorded with application of chicken manure with yeast. The highest records for total yield (ton/fed) was recorded with application of chicken manure or compost combined with and application of yeast followed by ascorbic acid. |