The coppices length growth of Ziziphus spina christi ( L.) Willd. and their stems diameters accumulation growth in irrigated areas at Wadi Shohouh - Hdhramaut

Abstract

Wadi Shohouh is located in main Wadi Hadhramaut as one of the tributary wadies Linked with southern
plateau. Attention has been paid by the Yemeni farmers to the multipurpose trees and shrubs that he
agrees this agrofrestry tree or shrub of Ziizyphus trees in Wadi Shohouh to be one of the component of his
farming system. Five farms of Ziizyphus trees in Wadi Shohouh, irrigated by wells water, have been
selected. After felling trees height and stem diameter coppices for six years have been recorded, then
static analysis has been computed. It is found that coppice height was high and fast at first year while
mean annual growth varied between 0.849 – 0.987 m, and mostly high standard deviation and coefficient
variation through six years were found between ± 0.736 – ± 1.866 and 12.427 – 47.063 % respectively.
Also high and fast growth of coppice diameter was found at first year of growth while mean annual
diameter growth was 0.735 – 1.149 cm and high standard deviation and coefficient variation through six
years were found also as ± 0.712 – ± 3.036 cm and 27.438 – 46.426 % respectively. Results of coppice
annual mean diameter growth accumulation showed significant differences at 5% level between years
where first year showed the best result ( 104.8 cm ).