Effects of Irrigation Management and Humic Acid on Yield and Yield Components of Peanut (Arachis hypogaea L.)

Peanut is an oilseed plant, which is rich in seed oil and protein content. The effects of different irrigation methods and humic acid dosages were explored on yield and yield components of peanuts in Astanehye Ashrafiyeh County in Guilan province, Iran, in 2018 and 2019 cropping years. The experiment was laid upon a splitplot design based on a randomized complete block design with three replications in which the main plot was assigned to irrigation treatments including rainfed treatment and irrigation to meet 60%, 80%, and 100% of water requirement, and the subplot was assigned to humic acid (HA) at four rates of 0, 3, 6, and 9 L ha1. The results showed that the highest biological yield (9750 kg ha1) was obtained from the plants irrigated to meet 80% of their water requirement and applied with 9 L ha1 HA and the lowest (2453 kg ha1) was produced under rainfed conditions with no HA applied. Seed yield was 1863 kg ha1 at the 80% water requirement level and 2067 kg ha1 at the HA level of 9 L ha1. Based on the results, it can be recommended to apply 9 L ha1 HA and supply 80% of the plants’ water requirement as appropriate conditions for the studied region.