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Soil Water Diffusivity and Soil Water Stress Coefficient Studies Using Weighting Lysimeter Data
오동식,제임스 에이야스,리차드 소페,엄기철,Oh, Dong-Shig,Ayars, James E.,Soppe, Richard,Eom, Ki-Cheol Korean Society of Soil Science and Fertilizer 1999 한국토양비료학회지 Vol.32 No.4
A new and relatively simple equation for the soil water content-pressure head curve, ${\theta}$(h) is described in this paper. The particular form of the equation enables one to derive closed-form analytical expressions for the relative hydraulic conductivity, Kr, when substituted in the predictive conductivity models of Y. Mualem. Hopmans' equation is presented as an experimental method. The experienced method, $ET_a=K_sK_cET_o$ is introduced to estimate the actual evapotranspiration, $ET_a$(or $ET_c$). Using $ET_c$ and coil water data measured automatically in a weighing lusimeter, $K_s$ and $K_c$ values are estimated. Recently, FAO has introduced calculation procedures for the soil water(stress) coefficient, Ks in "Guidelines for computing crop water requirements".