1. Technion–IIT Faculty of Civil and Environmental EngineeringHaifaIsrael
2. Inst. of Soil, Water and Environ. Sci.ARO, The Volcani Center68 HaMaccabim RoadRishon LeZion7505101Israel
3. Dep. of AgronomyUniv. of Wisconsin‐Madison1575 Linden DriveMadisonWI53706
4. Dep. of AgronomyIowa State Univ.2104 Agronomy HallAmesIA50011