Investigation of the Effect of Deficit Irrigation Methods on Water Productivity Indices and Some Agronomic Traits of Rice Plant (Binam Variety)

One of the most important goals of irrigation planning and management methods, considering the water crisis in recent years, is to increase water productivity for various plants, including rice. To investigate the effects of deficit irrigation methods on water productivity of rice (Binam Variety), an experiment was carried out with eight treatments and three replications in Babolsar city of Mazandaran province in 2020. The treatments were regulated deficit irrigation and partial root zone drying in soil drought stresses of 10, 30 and 60 kPa (RDI10, RDI30, RDI60, PRD10, PRD30 and PRD60) and full irrigation with drip tape and flood irrigation systems (control). Soil water deficit was measured by a tensiometer. In this experiment, traits including yield, water consumption, and plant shoot dry weight, root weight density, root length, physical water productivity, net profit efficiency per unit volume of water, irrigation and rainfall water efficiency and evapotranspiration efficiency were investigated. According to the results, the highest and lowest physical water productivity was corresponded for PRD60 and flood irrigation treatments, respectively (1.39 and 0.59 kg / m3). PRD treatments at similar stresses compared to RDI treatments had higher rough rice yield and higher physical and economic productivity despite of lower water consumption. PRD60 treatment increased the physical productivity of water by 135.6% and decreased the water consumption by 76.3%..