Title: The effect of different water management on promising varieties
Author: Reza Asadi
Abstract:
Due to the increasing shortage of water resources, it is necessary to use the available resources with the highest efficiency. The amount of water required by different varieties of rice is an important factor in water allocation and water management, especially in conditions of water shortage. Changing permanent flood irrigation from a conventional method to alternate irrigation is one of the strategies used to reduce water consumption in rice cultivation. Therefore, to measure the amount of water used and improve water productivity in the paddy field, field experiments were performed in the form of split plots. The main plot includes three irrigation methods 1- Permanent flood irrigation 2- alternate irrigation (water depth in the cylinder 5 cm below the ground) 3- alternate irrigation (water depth in the cylinder 12 cm below the ground). The sub-plot included two lines 8308 and 8315 and three cultivars Tolu, Tisa, and Taher, which were done in two replications in the two years of 2018 and 2019 in the deputy of Rice Research Institute of the country (Amol). The results showed that the effect of different irrigation methods on the amount of water consumption was significant and the highest amount was observed in permanent flood irrigation, which in the two years 2018 and 2019 were 7844 and 8352 cubic meters per hectare, respectively. Among the cultivars and lines, the lowest water consumption belonged to the Taher cultivar, which was equal to 6748 and 7140 (m3/ha) in 2018 and 2019, respectively. Different irrigation methods have affected the amount of water productivity and the highest amount of water productivity in 2018 and 2019 was equal to 0.88 and 0.78 kg / m3, respectively, related to the alternate irrigation method (I2). In experimental cultivars and lines, the highest water productivity was related to Tahir and Toloo cultivars, which were 0.73 and 0.65 kg / m3 in two years, respectively
Keywords: rice, Water productivity, Water stress, Water use, yield
Contact: r_asadi1@yahoo.com