Ruins of Ribun and Shibam city of Wadi Hadhramout show the evidence of using Ziziphus-spina christi wood in temple and house buildings at ancient time. The wood is still used now, but at a limited scale. Tree growth study was conducted on a group of Seder trees planted in two sites of well-irrigated areas and spate-irrigated areas. Growth menstruations were taken on tree coppices from felling trees while annual measurements had continued for 5-8 years regularly. Calculations of frequency percent of diameter size, classes of coppices as well as growth means of height, stem diameter, stem basal area, total basal area of coppices per tree and current annual increment were carried out. Results revealed that frequency percent of diameter size class (2.0-4.9 cm) was very high after one year of Seder trees felling. The diameter class (2.0-4.9 cm) frequency decreases within the advanced age and diameter growth increase. On other hand, frequency percent of diameter size classes (5.0-11.9 cm) and (12.0-20.9 cm) have increased instead. It was observed that environmental factors have influenced Seder trees growth. Hence, fast and high growth accumulation occurred under well-irrigated areas better than spate-irrigated areas.

Key Words :Coppices, Dumoon, Frequency, Growth, Menstruations, Seder Tree