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Hooshang Ghamarnia; Sajad Ameri; Mahtab Nekookish
Abstract
A part of the plants' water needs can be met by shallow groundwater with desirable quality. In this research, contribution of shallow and saline groundwater to evapotranspiration of rosemary plant was studied in a completely randomized factorial design with three replications and using drainage lysimeters ...
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A part of the plants' water needs can be met by shallow groundwater with desirable quality. In this research, contribution of shallow and saline groundwater to evapotranspiration of rosemary plant was studied in a completely randomized factorial design with three replications and using drainage lysimeters with a diameter of 1.20 m, in 2017 and 2018. The applied treatments included groundwater with salinity levels of 1, 2 and 4 dS/m at a constant depth of 0.8 m. The results showed that the total water requirement of rosemary was 597 mm. From total water required by the plant, 312.6 mm (54%), 260.3 mm (44%), and 201.1 mm (34%) were supplied by shallow groundwater with qualities of 1, 2 and 4 dS/m, respectively. The daily groundwater contribution was 4.9, 3.9, and 3 mm by, respectively, treatments 1, 2, and 4 dS/m. The effects of groundwater salinity on the yield of rosemary plant parameters were significant at the level of 5%, which can be attributed to the tolerance of this plant to groundwater salinity. In addition, due to the rosemary plant use of groundwater with different qualities, some water from surface water can be saved and irrigated land can be expanded, with consequently higher crop production and more jobs for farmers.
H GHAMARNIA; Milad farmanifard; SH SASANI
Abstract
Scarcity of water resources in spite of burgeoning population makes them important and necessitates optimum use of these resources. Shallow groundwater is a resource that has been ignored in irrigation management, while it is an available free source of water which can provide at least part of plants ...
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Scarcity of water resources in spite of burgeoning population makes them important and necessitates optimum use of these resources. Shallow groundwater is a resource that has been ignored in irrigation management, while it is an available free source of water which can provide at least part of plants water requirement. Therefore, a two-year experiment was conducted in 2009-2011 to find the effect of shallow groundwater tables, at 60, 80, and 110 cm depth, on water requirement, water use efficiency (WUE) and yield of three wheat cultivars, namely, W33g, Cross Alborz, and Bahar. Experiments were performed at RaziUniversity lysimeter research station No1 as a randomized complete block factorial experiment with three replications. In these experiments, 45 tubular poly ethylene lysimeters with 1.20m height and 0.30m diameter were fixed in the ground with 1m distance from each other. The highest utilization of groundwater was found for the water table depth of 60 cm and the lowest was found for the 110 cm depth. The 2-year average contribution to different cultivars by groundwater in depths of 60, 80, and 110 cm was 63%, 55% and 45%, respectively. The results for Cross Alborz cultivar showed no significant difference (P<0.01) in WUE between the three water table depth treatments. Overall, the optimum WUE and yield was found at water table depth of 80 cm.