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Influence of Plant, Soil, and Water on the Leaching Fraction

^a Dep. of Geological Science, Florida State Univ., Tallahassee, FL 32306-4100
^b Environmental Physics and Irrigation, Agricultural Research Organization, Gilat Research Center, D.N. Negev 85280, Israel
^c Dep. of Soil and Water Sciences, Faculty of Agricultural, Food and Environmental Sciences, Hebrew Univ. of Jerusalem, P.O. Box 12, Rehovot 76100, Israel

View larger version (31K): [in this window] [in a new window]   FIG. 1. Predicted relative yield (yield/yieldmax) as influenced by the ratio of irrigation to pan evaporation (I/E0) and electrical conductivity for the (a) Arava soil and (b) Millville soil with osmotic head that causes a 50% yield loss (50) = –45 m and matric head that causes a 50% yield loss (h50) = –15 m.

View larger version (40K): [in this window] [in a new window]   FIG. 2. Predicted relative yield (yield/yieldmax) as influenced by the ratio of irrigation to pan evaporation (I/E0) and electrical conductivity for the Arava soil with osmotic head that causes a 50% yield loss (50) = –60 m and matric head that causes a 50% yield loss (h50) = –60 m.

View larger version (15K): [in this window] [in a new window]   FIG. 3. Predicted steady-state matric head profiles for the sandy loam (SaL) and silt loam (SiL) soils from simulations of the electrical conductivity (EC) = 1.2 and 9 dS/m for ratios of irrigation to pan evaporation (I/E0) = (A) 1.6, (B) 1.0, and (C) 0.6.

View larger version (16K): [in this window] [in a new window]   FIG. 4. Predicted steady-state osmotic head (potential in kilopascals = 9.81 x head in meters) profiles for the sandy loam (SaL) and silt loam (SiL) soils from simulations of the electrical conductivity (EC) = 1.2 and 9 dS/m for ratios of irrigation to pan evaporation (I/E0) = (A) 1.6, (B) 1.0, and (C) 0.6.

View larger version (45K): [in this window] [in a new window]   FIG. 5. The leaching fraction as a function of salinity and the ratio of irrigation to pan evaporation (I/E0) for the Arava soil (sandy loam texture) computed with osmotic head that causes a 50% yield loss (50) = –45 m and matric head that causes a 50% yield loss (h50) = –15 m.