Investigation of regulator and stimulator organic fertilizers various levels effect on three hybrid maize (zea mays l. )agronomic traits growth trend in two planting dates.

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 yield with a humidity of 14% in the first and second cultivation date, respectively. Comparison between average fertilizer hybrid effects showed that single cross hybrid704 with fertilizer scale displayed 25% more than the manufacturer's recommendations with an average yield of 14.31 MT per hectare had the highest seed operation.Meanwhile comparison between the combination effects of fertilizers and hybrids showed that treatment including the single cross 704 hybrid and applied fertilizer according to the manufacturer's recommendations produced an average yield of 14.43 MT per hectare resulted the highest yield.Results of combined variance analysis presented differences for two cultivation dates concerning yield for the of three hybrid variety in respect of date of cultivation on the number of seed rows , 1000 seed weight, seed density, biological yield, phenotypic scale, oil and protein percentages (P1%) that affected the corn cover (P5%). The hybrids showed significant differences (P1%) for the above mentioned elements and on the height of plant (P5%) Cultivation date and hybrid treatments were affected the number of seed rows, number of seeds in rows, seed density, corn cover, and biological yield, phenotypic indexes, 10 corn cob weight and protein percentage (P1%) and corn height, seed length, and corn length (P5%).The comparison of combined average of reciprocal effect of cultivation date, fertilizer and variety showed that the treatment including the second cultivation date, fertilizer according to the manufacturer's recommendations and single cross 704 hybrids had the highest yield (14.43 MT per hectare).