Abstract
The study was conducted in the field of the Horticultural Facilities Unit of the Department of Horticulture and Landscape Engineering / College of Agriculture - Tikrit University during the 2023 agricultural Spring season to produce Zinnia spp, Profusion Doube mix as flowering potted plants. The experiment included two factors; the first factor was three levels of water stress: irrigation at a level of 100%, %75, %50 of field capacity (FC). The second factor was addition of potassium at four concentrations (0, 1, 2, 3) gl-1. The experiment was carried out according to the randomized complete block design (R.C.B.D) with split-plot system, and 4 pots per experimental unit at three replications. The results showed that irrigation treatment of 100% field capacity was significantly superior to in dry weight of shoot (4.00 g Plant-1). This treatment gave the lowest value (5.125 mg 100 gl-1) of chlorophyll content in leaves compared to the other irrigation levels. The treatment of 75% FC gave the lowest stem diameter (2.960 mm). Potassium addition treatment at 3gl-1 had a significant superiority in all the studied traits. The interaction between study factors showed that irrigation at 100% FC and adding potassium at 3 gl-1 gave a significant superiority in all characteristics.
Main Subjects
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