Occurrence and intensity of surface and end checks in air seasoned Eucalyptus grandis and hybrid clones

Abstract

Splits and checks are the most limiting factor affecting pole treatment plants in Uganda. These are attributed to the seasoning methods and conditions poles are attributed to. Since losses caused by surface checks and end splits in air seasoned eucalyptus can be prevented if correct measures are taken in the rightful time to cub their formation, the study was carried out to assess occurrence and intensity of surface splits and end checks in Eucalyptus grandis and hybrid cones’ poles New Forests Company pole treatment plant. The objectives were to determine the average surface check lengths and counts in E. grandis and in hybrid clones; to determine the average end check length in E. grandis and in hybrid clones as well as to assess the average end check depth in E. grandis and in hybrid clones . A total 40 Eucalyptus poles were obtained from 2 stacks of rejected poles. One stack contained E. grandis poles and the other GU7 rejects. 20 poles were randomly selected from each stack of rejects. The length of the surface and end checks was measured using a measuring tape while surface check count was taken by counting. End check depth was measured with the help of a metallic wire inserted into the check, the wire was drawn out and depth measured with a tape measure. Results showed that GU 7 splits more than Eucalyptus grandis with greater values of surface check length, end check length and depth. However GU 7 had fewer surface checks than Eucalyptus grandis. It was recommended that use of anti-split plates, girdling with wires and filling of splits with wax emulsion could be possible ways of reducing occurrence of splits in pole treatment facilities.