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Pourgholam Amiji, M., Liaghat, A., Nazi Ghameshlou, A., Khoshravesh, M. (2018). Effect of Shallow and Saline groundwater on Rice Growth and Biomass. , 32(4), 499-515. doi: 10.22092/jwra.2019.118520
Masoud Pourgholam Amiji; Addolmajid Liaghat; Arezoo Nazi Ghameshlou; Mojtaba Khoshravesh. "Effect of Shallow and Saline groundwater on Rice Growth and Biomass". , 32, 4, 2018, 499-515. doi: 10.22092/jwra.2019.118520
Pourgholam Amiji, M., Liaghat, A., Nazi Ghameshlou, A., Khoshravesh, M. (2018). 'Effect of Shallow and Saline groundwater on Rice Growth and Biomass', , 32(4), pp. 499-515. doi: 10.22092/jwra.2019.118520
Pourgholam Amiji, M., Liaghat, A., Nazi Ghameshlou, A., Khoshravesh, M. Effect of Shallow and Saline groundwater on Rice Growth and Biomass. , 2018; 32(4): 499-515. doi: 10.22092/jwra.2019.118520

Effect of Shallow and Saline groundwater on Rice Growth and Biomass

پژوهش آب در کشاورزی
Article 3, Volume 32, Issue 4, February 2019, Pages 499-515    PDF (1.17 M)
Document Type: Research Paper
DOI: 10.22092/jwra.2019.118520
Authors
Masoud Pourgholam Amiji1; Addolmajid Liaghat2; Arezoo Nazi Ghameshlou* 3; Mojtaba Khoshravesh
1Department of Irrigation & Reclamation Engineering, Faculty of Agronomy Engineering & Technology, College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran.
2Professor, Department of Irrigation & Reclamation Engineering College of Agriculture & Natural Resources, University of Tehran.
3Department of Irrigation & Reclamation Engineering Faculty of Agronomy Engineering & Technology College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran.
Abstract
 
The problem of soil salinity exists in the paddy field areas in Iran, especially in the Caspian Sea coastal areas, due to its proximity to the sea and low altitude with saline and shallow water table. Besides, considering that rice is one of the most important strategic crops for economy of Iran and the people in this area, this research was necessary in order to investigate the possibility of production of rice in the presence of shallow and saline groundwater table. This research was performed as a physical model (insulated metallic lysimeter) in the Meteorological Research Center of College of Agriculture and Natural Resources, University of Tehran, in 2017. The complete randomized design included two treatments with shallow water table: FSG and SSG, with fresh (control) and saline water, respectively. The salinity of irrigation water was 0.94 dS/m for both treatments. Moreover, for SSG treatment, the EC of shallow groundwater was 20 dS/m at 40 cm soil depth and was regulated as an artificial recharge. The results of salinity profile in SSG treatment showed that there was almost no mixing of fresh and saline water in interstitial zone (under the hard pan from 30 cm to 40 cm of soil surface). In this manner, there was insignificant effect of salinity in the root zone, because of existing of permanent water layer in rice field and downward water flow, which makes an obstacle for upward flow for saline water. This problem did not affect the rice yield, which didn’t decrease. The results of data analysis confirm this and show that shallow groundwater salinity has no significant effect on the parameters like leaf area index (LAI), root length (RL), plant length (PL), membrane stability index (MSI), chlorophyll (SPAD), relative water content (RWC) and the biomass (BIO). The difference between the performance of the control and the salinity treatments was about 1 to 12 percent, while the grain and biological yield in SSG treatment compared with FSG treatment decreased 3.2% and 4.5 percent, respectively. Therefore, considering the significant leaching of soil after cultivation, the negligible loss of yield and upward movement of saline water in the soil, production of rice and other plants in such areas seems possible. Also, with the help of efficient and effective use of lands with shallow saline groundwater, we can decrease the pressure on conventional soil and water resources.
 
Keywords
Coastal areas; Shallow water table; Lysimeter; Rice yield; Salinity profile
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