Co-Authors:
Tsvetkov, F., Inst. of Soils & Water, Agricultural Research Organization, P.O.B. 6, The Volcani Center, Bet Dagan 50-250, Israel.
Mingelgrin, U., Inst. of Soils & Water, Agricultural Research Organization, P.O.B. 6, The Volcani Center, Bet Dagan 50-250, Israel.