Abstract
The aim of this study was to set up an irrigation scheduling for bare-root Anatolian black pine seedlings growing in the Egirdir Forest Nursery using plant water potential as an indicator of plant water stress. For this purpose, predawn, midday and daily plant water potentials were measured periodically with plant pressure chamber from mid April till mid November in second growing season of Anatolian black pine seedlings. According to the results, irrigations in the nursery should start in mid April and continue until early June and should be applied when predawn water potential drops below -0.5 MPa. After this period in the phase of bud dormancy initiation (early June till early September), to stimulate root growth and extension only when predawn water potential drops -0.8 MPa, seedlings should be adjusted to bring the top 20 cm of the soil to field capacity. In the last period (early September-mid November) watering should commence when predawn water potential drops below -1.3 MPa. Plant water potential should not be allowed to fall below -1.3 MPa during the day. Keyword: Anatolian black pine, predawn water potential, irrigation scheduling
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