Effects of root undercutting, fertilization and thinning on seedling growth and quality of oriental beech (Fagus orientalis Lipsky) seedlings

Abstract

In this study, the effects of root undercutting, fertilization and thinning applications on the morphological characteristics of oriental beech seedlings grown in Karadağ Forest Nursery were investigated. In 2+0 years old seedlings, the effects of treatments including by making root undercutting and thinning (A) and by giving 50 g of ammonium nitrate fertilizer per m 2 addition to thinning (B) in July were examined. Moreover, quality classes of seedlings were determined on the basis of treatments. According to the result of this study, significant differences were found between the morphological characteristics of the seedlings depending on the treatments. It was determined that while there is a statistical significance in terms of seedling length, sturdiness quotient, the number of side branches, shoot and root fresh weight, shoot and root dry weight, shoot dry weight/root dry weight, root percentage, Dickson quality index, there is no significance in terms of root collar diameter, fresh seedling weight, dry seedling weight in 2+0 years old seedlings. According to Turkish Standards Institute's deciduous seedling standard (TS 5624/21.03.1988) prepared in March 1988, 48.8% of A treatment and 76.7% of B treatment and 78.9% of the control group were found to be Class I. According to Dickson quality index, the quality index values of seedlings in 2+0 A, 2+0 B and control were determined as and 1.05, 0.74 and 0.68 respectively. In determination of Dickson quality index value, using of important parameters used for determination of seedling quality is important in terms of obtaining more accurate results. Özet Bu çalışmada, Karadağ Orman Fidanlığı'nda yetiştirilen Doğu kayını fidanlarında uygulanan yerinde kök kesimi, seyreltme ve gübreleme uygulamalarının morfolojik özellikler üzerindeki etkileri araştırılmıştır. Çalışmada iki yaşındaki fidanlarda Temmuz ayında kök kesimi ve seyreltme yapılarak (A) ve seyreltme yapılıp ve metrekareye 50 g amonyum nitrat gübresi verilerek (B) bu işlemlerinin etkisi incelenmiştir. Ayrıca işlemler bazında fidanların kalite sınıfları belirlenmiştir. Yapılan işlemlere bağlı olarak fidan morfolojik karakterleri arasında önemli farklılıklar tespit edilmiştir. Fidan boyu, gürbüzlük indisi, yan dal sayısı, gövde taze ağırlığı, kök taze ağırlığı, gövde kuru ağırlığı, kök kuru ağırlığı, katlılık, kök yüzdesi ve Dickson kalite indeksi bakımından 2+0 yaşlı fidanlarda yapılan işlemlerin istatistiki olarak etkisi olduğu, kök boğazı çapı, fidan taze ağırlığı ve fidan kuru ağırlığı bakımından ise işlemler arasında istatistiki olarak bir fark olmadığı tespit edilmiştir. Türk Standartları Enstitüsünün Mart 1988'de hazırlamış olduğu yapraklı ağaç fidanı standardına (TS 5624/21.03.1988) göre A işleminin %48.8'i, B işleminin %76.7'si kontrol grubunun ise %78.9'u I. sınıf çıkmıştır. Dickson kalite indeksine göre fidanların kalite indeks değerleri 2+0 A, 2+0 B ve kontrol grubunda sırasıyla 1.05, 0.74 ve 0.68 olarak belirlenmiştir. Dickson kalite indeksi değerinin belirlenmesinde fidan kalitesini belirlemede ...

Production of high-quality seedlings of Handroanthus spongiosus (Bignoniaceae), native to a seasonally dry tropical forest

“…Definition of the time for seedlings to remain in nurseries generally depends only on shoot length and stem diameter, without paying attention to the size of the roots [47]. However, it is intuitive that well-developed roots favor the formation of healthy seedlings, by fortifying the entire structure, increasing the chances for growth and development in the field, especially in arid and semiarid regions where erratic rainfall is among the most restrictive factors for establishment [48].…”

“…The Dickson quality index (DQI) is considered a good indicator of seedling quality because it reflects the balance in distribution of dry biomass and growth between the shoots and roots, enabling the choice of seedlings better able to adapt to adverse field conditions [47]. Higher values of this index are associated with greater chance of survival and establishment of seedlings in the field [49,50].…”