Document Type : Research Paper
Department of water engineering, Faculty of soil and water engineering, Gorgan University of Agricultural Sciences and Natural Resources
Assoc Professor, Department of water engineering, Faculty of soil and water engineering, Gorgan University of Agricultural Sciences and Natural Resources
The goal of this study was to investigation the effect of conjunctive irrigation with seawater and fresh water on biochemical properties and water use efficiency of dill (Anethum graveolens L.) in greenhouse condition. In this study, five conjunctive uses of seawater and fresh water are evaluated on yield and yield components of dill. The research was done based on completely randomized design including three replications as pot planting in Gorgan University of Agricultural Sciences and Natural Resources during 2016. In this study, five irrigation regimes existed of irrigation with one-third of sea water with tsp water, irrigation with half seawater and then one more half with fresh water, alternate irrigation with seawater and tap water, conjunction irrigation. The results inducted that the effect of different irrigation regimes on total chlorophyll and Cl-of leaf were highly significant (P<0.01), but Na+, K+, Na+/K+ and water use efficiency were significant at 5% levels (P<0.05). In conclusion, the results showed that with increasing in salinity level, total chlorophylls, K+ of leaf and water use efficiency were significantly decreased, but Na+ and Cl- were significantly increased. The result shows that the one-third seawater and tap water irrigation regimes had the highest total chlorophylls, K+ of leaf and water use efficiency. one-third, half alternate, alternate and mixture of sea water and tap water have resulted to decreasing of water use efficiency 27.6, 50.4, 59.1 and 68.1 percent, respectively.