Determination of Sedum (Sedum cv. Nevii) Water Requirement, Crop Coefficient, and Water Productivity in Greenhouse Conditions

Considering the increase in the production of apartment flowers in the greenhouse, this study was conducted with the objectives of determination of Sedum (Sedum cv. Nevii) evapotranspiration and crop coefficient in greenhouse conditions and the effect of deficit irrigation on shoot fresh weight and water productivity. The experiment was carried out from July 2017 to January 2018 in the greenhouse of the Green Space and Beautification Office of Urmia Municipality. To determine crop coefficient, Sedum and grass evapotranspiration was measured based on the water volume balance approach for 90 days. Results showed that the average evapotranspiration of Sedum and grass were the same as 2.0 mm/day and the average Sedum crop coefficient was 0.99. Sum evapotranspiration of Sedum and grass during the test period were 180.3 and 179.5 mm (respectively). A deficit irrigation test was done on a completed randomized blocks design with 4 replications. The distance between the blocks and the pots in the blocks was 1m. Irrigation levels were 100% (control treatment), 80%, 60%, and 40% of Sedum water requirement and the pots were irrigated once in 3 days. Based on the results, the effect of irrigation levels on shoot wet and dry weight and water productivity were significant but on the root, wet and dry weight were not significant. A maximum and minimum average of shoot fresh weight were achieved in control and 40% treatments with 92.5 and 33.4 gr (respectively). Maximum water productivity was obtained in 80% treatment with 23.75 gr/lit and its difference with control treatment was not significant.