Investigating the effect of humic acid and micronutrient nano fertilizers on the response of rainfed chickpea (Cicer arietinum L.) in autumn cultivation

  This study was carried out to investigate the effect of Humic acid and micronutrient nano fertilizers on rainfed chickpea response under field conditions located in Kamyaran-Kurdistan during 2015-2016 year. The experiment was split plots in a randomized complete block design with three replications. The main factor was foliar application of Humic acid in three levels including (control, four and five kilograms per hectare) and the sub-factor of foliar application of micronutrient nano fertilizers in four levels including (control: distilled water, nano-iron, nano-zinc, nano-iron + nano-zinc). The results showed that the effect of Humic acid on plant height, number of main branches and number of pods traits was significant. So that application of five kilogram per hectare  Humic acid significantly increased these traits. In this experiment, the application of micronutrients nano fertilizers also showed significant difference in traits of number of axillary branches, number of pods, grain and protein yield. Finally, the maximum number of pods, grain and protein yield were achieved in response to the interaction of five kilogram per hectare of Humic acid and iron+zinc nano fertilizer. So that compared to the control (no application of Humic acid and no application of iron nano fertilizer + nano-zinc) increased  the mentioned traits 78/69, 65/54 and 84/5 percent, respectively. The results of correlation between traits also indicated a positive and significant correlation between grain yield with number of axillary branches and number of pods per plant (0/76 and 0/97 percent, respectively.