The effect of Humic acid usage on the specific weight of stem and its components in Maize SC varieties

Maize (Zea mays L.) is one of the most highly consumed crops, and the most important foodstuff after wheat and rice around the world. Humic acids (HA) are a major component of organic fertilizers. In order to study the response of maize genotype against the application of peat and leonardite based liquid humic fertilizers, an experiment was conducted at experimental field of Islamic Azad University, Ardabil Branch in 2009-2010 cropping year. The Experiment was conducted of randomized complete block design (RB) with three replications. Treatment used on the Single cross 704 genotype was at three Conditions (peat based humic fertilizer; leonardite based humic fertilizer; without the application of humic fertilizer). Results showed that there was significant difference between the experimental conditions (test solution) of the special weight of peduncle and specific weight between Pre-terminal nodes at 1% level and in terms of specific weight of stem in the 5% level.The results of the comparison data on the experimental conditions (test solution) showed the Humic liquid fertilizer based on Leonardite and the liquid Humic fertilizer based on pit respectively with average of 1.05 and 1.27 were the best condition in terms of specific weight of stem and normal condition with an average of 1.58 was in the next rank.