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effecst of organic growth regulator fertilizers on three single cross hybrids of maize studied at two sowing dates, in research station in SPCRI, Karaj,Iran in 1387. The experiments were a split plot based on a randomized block design with four replicates.Four organic fertilizers Aminol-Forte ( according to the manufacturer's recommendations, 25 % more, 25 % less and mixed organic fertilizers) and three maize hybrids( single crosses 704,500,260) were used as the main and subsidery plots, respectively. Seed yield, number of seeds in rows, number of seed rows, total number of seeds, weigh of thousand seeds, height of corn plants, stalk diameter, seed length , seed width, corn cob length, corn cob diameter, seed density, phenotypic indexes, ASI, 10 corn cob weigh, corn cover, biologic operation, oil percentage, protein percentage and physiological indexes like quality characters were measured. Results of the first cultivation date, showed that fertilizers had no significant effects on the mentioned characteristics, where effects of hybrids were significant (P5%) for number of seed rows, total number of corn seeds, weigh of thousand seeds, corn height, stalk diametre, corn weigh, seed density, phenotypic indexes, 10 corn cob weigh, 10 corn weigh, corn cover, biological operation, oil and protein percentages. Results from the second cultivation date confirmed that fertilizers had no significant effect on all characters. Moreover, the effect of hybrids on operation and ASI was significant in 1% and its effect on height of plant and biologic operation at 5 % of probability level.Single cross 704 hybrid yield at 12.7 and 14.17 Mt/ hectare reached the highest seed …