This issue's cover: In semi-arid regions where irrigation water amount is a limiting factor, efficient water use is possible with close monitoring to minimize water stress. Currently, such monitoring is conducted in the soil, however the use of trees stems to observe the water stress is being researched. Three-rod TDR probes (70-mm) were installed in the trunks of 5-yr old lemon [Citrus limon (L.) Burm. F] trees to examine water stress reflected in the stem water content. Please see "Evaluation of TDR Use to Monitor Water Content in Stems of Lemon Trees and Soil and Their Response to Water Stress" by A. Nadler, E. Raveh, U. Yermiyahu, and S.R. Green, p. 437-448.