الفهرس 
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Abstract
This investigation was carried out during the two successive Summer seasons of 2014 and 2015, respectively at the Experimental Farm of the Faculty of Agriculture Minia University, Minia Governorate, Egypt. Two tomato hybrids (Nema 1400 and Platinium 5043) were selected for this study. These experiments were conducted to evaluate the effects of 4-chlorophenoxy acetic acid at four levels i,e: 0, 40, 80 and 120 ppm and sprayed twice, the first one at the initial of bud flowering and the second one after three days later .Whereas, the humic acid at four rates i.e.: 0, 2, 4 and 6 Kg /Fed. was applied twice, the first one after three weeks from transplanting and the second one after one weeks from the first application.