پديدآورندگان :
Noshadi M. noshadi@shirazu.ac.ir Associate Prof, Dept. of Irrigation Engineering, Shiraz University, Shiraz- Iran. , Valizadeh H. M.Sc. Student, Department of Irrigation Engineering, Shiraz University, Shiraz- Iran.
كليدواژه :
Chlorine , Salinity , Sodium , Soil reclamation , Vetiver.
چكيده فارسي :
Soil salinity is one of the major limitations of agriculture in the hot and dry regions. Soil sodification also damage soil structure and reduce soil permeability. Therefore, in control of soil salinity, chlorine and sodium is very important. Vetiver grass has unique characteristics that can be useful in phytoremediation. This research was conducted to investigate the effects of irrigation with different salinities on Vetiver grass and the effects of this plant on the control of soil salinity and soil reclamation. Water irrigation salinities were 0.68 (blank), 2, 4, 6, 8 and 10 dS/m, respectively, which artificially constructed using sodium chloride and calcium chloride. At first, Vetiver was transplanted and then moved to the farm. The results showed that the Vetiver has been able to decrease soil salinity at different salinity levels except highest water salinity (10 dS/m) and prevent salt accumulation in the soil. However, in the salinity of 10 dS/m, soil salinity was lower than the irrigation salinity. In these water salinities, the mean ECe at 0-90 cm soil depth were increased 25.0, 60.4, 79.2, 87.5 and 215.5%, respectively, relative to control treatment, which was much less than the increasing of irrigation water salinities. This increasing in ECe was significant at 5% level of probability. Sodium contents relative to control treatment at above salinity levels in vetiver leaves were increased 14.3, 28.6, 64.3, 100.0 and 114.3%, respectively and in the vetiver roots were increased 28.6, 64.3, 125.0, 214.3 and 275.0%, respectively, which indicated an improvement of sodium accumulation in leaves and roots with increasing salinity levels. Chlorine concentration at irrigation water salinities of 2-10 dS/m in vetiver leaves were 22.9, 35.6, 74.5, 107.2 and 121.9%, and in the vetiver roots were 27.02, 59.7, 118.9, 195.06 and 255.7% more than control treatment. The mean sodium and chlorine content in all salinity levels in the roots were 170.3 and 164.1% more than the leaves, respectively.
