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<br />Table 3.4. Continued. <br /> <br />Reference <br />Willardson <br />(cont.) <br /> <br />Constituents <br />rrodeled <br /> <br />'" <br />'" <br /> <br />Major Assumptions <br />in salinity nodel <br /> <br />is constant. <br />(3) Each soil depth increment <br />is an open system with respect <br />to 002 exchange with soil at- <br />nosphere. <br />(4) Henry law constant is in- <br />dependent of temperature and <br />salt concentration. <br />(5) Cation exchange capacity <br />(GEe) is a constant for a given <br />soil, independent of pH, ion <br />type and concentration. <br />(6) CEe ~ Xca + ~ + Xna + ~. <br /> <br />(7) HaJ3 ' aJ3 ratio remains <br />constant. <br /> <br />Input data <br />requirements <br /> <br />Time-. <br />increment <br />.~~--- <br /> <br />Comnents <br /> <br />dissolution (SALT FLOiI II). <br />c) Sam: as above plus ca- <br />tion exchange equilibrium <br />reactions, (SALT FLOiI III) <br />d) M:ldel can handle trans- <br />cient noisture flow. <br /> <br />tU& <br /> <br />M:ldel <br />Application <br /> <br />