Investigation the effect of humic acid in irrigation water on yield and yield components of rapeseed

In order to evaluate the effect of humic acid in irrigation water on yield and yield components of rapeseed an experiment was conducted in 2015 based on randomized complete block design with three replications at research farm of Shahr-e-Qods branch, Islamic Azad University. The treatments were: control 0, 100, 200, 300, 400 and 500 mg per liter humic acid in irrigation water. In this experiment were used of 18 lysimeters. Each level is divided into three parts in three stages (establishment of the plant, stem elongation and flowering) along with irrigation water was used. Then lysimeters filled with soil and Were irrigated until the soil reaches field capacity moisture for sowing is early. Planting is done by hand after making lines and irrigation was done immediately.Irrigation system was done by furrow method and all necessary care, including narrow and broad-leaved weeds removal was done by hand weeding. The final harvest took place when a full investigation takes place and the moisture in the standard range. Based on test data analysis of all traits was influenced by humic acid. The results of this trial showed that treatment with application of humic acid, yield components, seed yield, Biological yield and Harvest Index, obtained with the highest amount. In between levels monitored at 500 mg per liter humic acid, showed the best performance.