Theoretical and Applied Forestry

Effects of humic substance application on the development of Anatolian black pine seedlings

Durmus CETINKAYA — 2024-10-13

This study was carried out to evaluate the effect of humic substance application on the growth of Anatolian larch (Pinus nigra Arnold.) seedlings at the 5th growth stage. In the study, characteristics such as seedling height, root collar diameter, seedling fresh and dry weights, and vigor marker of larch seedlings treated with humic substances were examined. For this reason, 5%, 10%, 15% and 20% humic substance treatments were applied to the seedlings. Although there were significant differences between treatments and seedlings, the highest growth in terms of average seedling height (46,33 cm) and root collar diameter (11,41 mm) was determined in the 5% humic substance treatment. As a result of the correlation analysis, statistically significant positive relationships were found among the seedling characteristics. It was determined that humic substance treatments positively affected the morphological characteristics of seedlings. Furthermore, XRF analysis showed that humic substance application increased the uptake of compounds such as K₂O, Cr₂O₃, TiO_2,ZnO, MnO and Nb₂O₅. Therefore, it was deemed appropriate to recommend the application of 5% humic substance in the applications. The results of the research support the widespread use of humic substance applications in forestry applications.

Evaluation of industrial plantation application results in terms of natural and artificial regeneration method

Gulnur Saba ERTUGRUL — 2024-10-13

In recent years, the increase in demand for wood and wood products in the world has brought industrial plantation applications to the forefront. With the industrial plantation application, it is aimed to obtain the highest amount of wood product from the unit area in a short time. Fast growing tree species and saplings obtained as a result of genetic breeding work contribute to the realization of this purpose. This study, which was carried out to contribute to industrial plantation and rejuvenation studies, was carried out with 324 individuals (90 natural and 234 artificial) aged between 1 and 11 years. In the study, the Mann-Whitney U test was used to compare the growth characteristics of seedlings planted in industrial plantation areas and seedlings obtained naturally from seed. As a result of the analysis, there is a significant difference (P < 0.05) in each of the EP1, EP2 and EP3 areas in terms of height and age values of individuals according to the regeneration method. There was a significant difference (P < 0.05) in the bottom diameter values of the individuals in EP1, EP2, EP3 and EP4 areas. In terms of growth characteristics according to the regeneration method, it was determined that the growth characteristics of the individuals obtained by planting were higher than the growth characteristics of the individuals obtained by seed.

Acorn yield and tree diameter relations in Turkey oak (Qercus cerris L.)

Sinan YUCEDAG — 2024-10-13

Acorn production, diameter at base, diameter at breast height, and ratios were related in Turkey oak also known mossy oak (Qercus cerris L.) in this study. Data of 50 trees sampled from natural areas was collected to contribute silvicultural and other forestry practices of the species. Depending on results of correlation analysis, diameter at base, diameter at breast height had significantly effective on acorn production (r=0.56, 0.48, p<0.05), while ratios of diameters were not significantly effective on the production (p>0.05). Results of the study were discussed for potential forestry practices of the species.

The use of seaweed in the production of ornamental plants

Cengiz YUCEDAG — 2024-10-13

Ornamental plants play a crucial role in urban green spaces by enhancing aesthetic value and providing ecological and economic benefits. They help improve air quality, support biodiversity, and contribute to environmental purification. The horticultural industry benefits from cultivating ornamental plants, it faces challenges such as soil health and environmental pollution due to high-yielding cultivars and chemical fertilizers. To address these challenges, integrating sustainable practices, such as using seaweed as an organic fertilizer, can provide solutions. Seaweed, rich in essential nutrients and growth hormones, improves soil fertility, plant growth, and resilience against environmental stresses. Studies have shown its effectiveness in enhancing growth parameters, mitigating salinity stress, and increasing yield and quality in various ornamental plants. However, the response to seaweed varies across species and conditions. To optimize its use, tailored application rates, combined sustainable practices, and continuous monitoring are recommended. Further research is also needed to develop comprehensive guidelines for its application in ornamental plant production.

Stone pine in Turkish forestry (Pinus pinea L.)

Tugce BALOGLU ERTAS — 2024-10-13

This study was carried out on the Stone Pine (Pinus pinea L.) species, which is widely distributed in the world and in Turkey and has sociocultural, ecological, economic and aesthetic value in Turkish forestry. Stone pine wood, bark, resin and seeds called pine nuts are used. Pistachio pine is of great importance in the country's economy, both for its use in erosion control studies in sandy-arid areas and for production of pine nuts. Pine nuts are among the exported species classified as non-wood forest products. In 2023, $33,107,813 export revenue was obtained with 565 tons. As the versatile use of forests other than wood raw material increases day by day, and the Pistachio pine species subject to the study has such economic value and is naturally distributed in our country, the demand and applications for the species are also increasing.