Yield table for selected black locust (Robinia pseudoacacia L.) cultivars

Tamás Ábri,Károly Rédei,Fruzsina Szabó,Zsolt Keserű

doi:10.34101/actaagrar/1/8854

Abstract

In Hungary, the black locust (Robinia pseudoacacia L.) can be considered as the most important fast-growing, stand-forming introduced tree species. Due to its positive growing technological characteristics as well as wood utilization possibilities, at the present, black locust is the most widely planted tree species in Hungary, covering 25% of the country’s total forest area. One of the important tasks ahead of Hungarian black locust growers is to improve the quality of black locust stands with introducing selected cultivars. For the estimation of the growth rate and yield a numerical yield table has been constructed on the basis of surveys of the experimental plots established in pure,managed ’Nyirségi’ ,’Üllői’ and ’Jászkiséri’ black locust cultivars’ plantations which can be suitable for sawlogs production. In the course of 56 stand surveys the key stand characteristics were measured, and then, were reconsidered the average height, diameter (DBH), volume, basal area and stem number given separately for the main (remaining), secondary (removal) and total stands per hectare. The programmable editing procedure allows to extention and formal change of information content of the yield table according to different demands.

Highlights

Some cultivars are suitable for both forestry and honey production
Yield class is called the intensity of height growth of a given stand compared to the all same tree species of the country, from best to worst from I to V marked by Roman numerals
The yield table demonstrated in this paper supposedly applies to average rather than full stocking

Summary

Introduction

Some cultivars are suitable for both forestry and honey production. Such double-use cultivars are ’Zalai’,’Kiskunsági’, ’Császártöltési’, ’Egylevelű’, and ’Váti46’ (Keresztesi, 1988).Black locust cultivars that can be suitable for sawlogs production are of decisive importance for primary wood production. Some cultivars are suitable for both forestry and honey production. Black locust cultivars that can be suitable for sawlogs production are of decisive importance for primary wood production. We selected ‘Nyírség’, ‘Üllői’ and ‘Jászkiséri’ cultivars for systematic yield studies. Based on the evaluations of long-term yield experimental plots (Bujtás, 1984; Keresztesi, 1988; Rédei, 1984, 1994, 2006, 2008, 2013; Hegede, 2018; Rédei et al, 2020) it has become possible to compile their yield table, which is the first to be published in English in this publication. The Hungarian primary wood production practice uses yield tables with 6 yield classes (Sopp and Kolozs, 2000). The cultivation technological objectives and economic aspects of plantation forestry are mainly take into account only the stands of I–IV

Methods

Results

Conclusion