The Effect of Irrigation Regims and Humic Acid Levels on Quantitative and Qualitative Characteristics of Peanut (Arachis hypogaea L.)

In order to investigate the effect of irrigation regimes and amounts of humic acid on the quantitative and qualitative characteristics of peanuts, an experiment was conducted a split in a randomized complete block design. It was performed with three replications in the cropping years of 2018 and 2019 in Astana-Ashrafieh city of Guilan province. Experimental treatments included irrigation regime (rainfed and water requirement of 60, 80 and 100%) as the first factor and humic acid (without fertilizer, 3, 6 and 9 L.ha-1) as the second (secondary) factor. The results showed that the interaction of irrigation and humic acid on biological yield and pod and grain yield was significant. The highest grain yield was obtained in the irrigation treatment of 100 and 80% of water requirement and with the use of humic acid 9 L.ha-1 with an average of 2562 and 2526 kg.ha-1, respectively. Biological yield under 80 and 100% water requirement was 6714 and 6772 kg.ha-1, respectively. The highest biological yield was observed in different amounts of humic acid in treatments of 9 L.ha-1 at the amount of 7436 kg.ha-1. Pod yield in the treatment of 80 and 100% of water requirement were 2427 and 2435 kg.ha-1, respectively. The lowest and highest pod yields in different amounts of humic acid were in the treatments without fertilizer and 9 L.ha-1 with an average of 1453 and 2706 kg.ha-1, respectively. Treatment of 80% of plant water requirement and the amount of humic acid consumed at 9 L.ha-1 with an average of 745.5 kg.ha-1, had the highest rate compared to other treatments. According to the research results, the use of humic acid 9 L.ha-1 can be suggested by providing 80% of water requirement as suitable conditions for the study area.