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Abstract
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In order to investigating the effect of humic acid. Iron chelate، nano-iron chelate on photosynthetic pigmentation of tomato seedlings In the experiment a of completely randomized design with three replications was used. Treatments include 8-compound fertilizer The two levels of humic acid(0,0/15 grams per liter) iron(0,0/3 grams per liter) and، nano-iron chelated(0,0/2 grams per liter) with two varieties of tomato. The results obtained showed that the growth parameters in plants exposed to humic acid and iron nano-chelate were increased compared to the control. The combination of humic acid and iron nano-chelate had the highest effect on root length, root fresh weight and fresh weight.
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