Research Information System
Thesis Type: Postgraduate
Institution Of The Thesis: Ankara University, Ziraat Fakültesi, Bahçe Bitkileri Bölümü, Turkey
Approval Date: 2024
Thesis Language: Turkish
Student: FEYZA KARAKAŞ ULEMA
Supervisor: Veli Erdoğan
Abstract:
In Ankara, where the continental climate prevails, walnut saplings cannot be produced successfully due to frosts in winter, late spring and early autumn. In this study, the effect of cold storage of ring budded walnut seedlings during winter and planting in early spring on the grafted walnut plant production was examined. Ring buds of Chandler and Fernor cultivars (Juglans regia) were budded in Bandırma, Balıkesir. These seedlings were transported to Ankara and either planted immediately in the field at early winter (control) or stored in cold room (+4 oC and 95%humidity) during the winter for about 2.5 months and then planted in early spring. Graft points were covered with soil against frost damage. The bud survival rate was significanly higher (98.13%) in early spring planting than early winter planting (85.69%), but was similar (90%≤) among the cultivars. The shoot formation rate was significantly higher in early spring planting (86.44%) than early winter planting (54.3%), and in Fernor (84.74%) than Chandler (56.0%). The average shoot length and diameter (at 5 cm above graft point) were 66.71 cm and 12.41 mm, respectively. Sapling production rate was 76.23%and 45.60%in early spring and early winter plantings, and was 75.31%and 46.56%in Fernor and Chandler, respectively. The rate of first grade saplings was 24.32%in Fernor and 3.95%in Chandler, but did not differ among the planting dates. The rate of saleable saplings was similar among the planting dates and cultivars. As a result, success could be achieved in grafted walnut propagation especially using Fernor cultivar in Ankara conditions by storing buded seedlings in cold storage during winter and planting them later in the early spring.