Cercis siliquastrum L., Malus trilobata Schneid and Acer syriacum Boin and Gaill water use as affected by two fertilizer rates |
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Authors: | Hala G. Zahreddine Daniel K. Struve Salma N. Talhouk |
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Affiliation: | 1. Department of Horticulture and Crop Sciences, The Ohio State, University, Columbus, OH 43210, United States;2. Faculty of Agriculture and Food Sciences, The American University of Beirut, PO Box 11-0236, Beirut, Lebanon |
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Abstract: | There has been an increased demand for landscaping plants in Lebanon as a result of numerous reconstruction projects. Sustainable landscape regulations have created a need for regionally adapted taxa, especially those with low water requirements. Therefore, water use of container-grown plants and the impact of fertilization on water use were studied in the following native species: Cercis siliquastrum L. (six mother trees), Malus trilobata Schneid (two mother trees) and Acer syriacum Boin and Gaill (one tree). Two-year-old containerized seedlings were grown at The Ohio State University (Columbus, USA) under two fertilizer rates: 25 or 100 mg N L−1 of 21 N–3.1 P–5.9 K water soluble fertilizer. Water use estimates were made by saturating the containers early in the morning, allowing them to drain for 1 h, weighing them and re-weighing approximately 5 h later. Although there were differences in seedling heights, those grown at 25 mg N L−1 were taller than those at 100, there were few differences in water use per seedling. In August, Cercis seedlings grown under 100 mg N L−1 had higher height adjusted water use (g water cm−1 height h−1, a method for standardizing water use among different sized plants) than those grown under 25 mg L−1. However, there were no differences in height adjusted water use in September attributed to fertilizer rates. In September, Acer seedlings had higher water use cm−2 leaf surface area under 25 than 100 mg N L−1. There were no differences in water use among the progeny from the six Cercis mother trees. However, the seedlings from one Malus tree had higher water use cm−2 leaf surface area than those from the other tree, even though the extant trees were separated by less than 20 m. |
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Keywords: | Judas tree Syrian maple Apple tree Lebanese flora Container production Woody ornamentals Water use efficiency |
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