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j <br />n <br />n <br />r <br />I <br />C <br />�J <br />Table 1. ECHO probe response in Forward soil at water contents and temperatures <br />used for calibration. <br />Volumetric <br />Water <br />Content <br />ECHO <br />Probe Response (mV) <br />5 °C <br />10 °C <br />20 °C <br />25 °C <br />30 °C <br />0.0365 <br />516 <br />526 <br />543 <br />552 <br />559 <br />0.129 <br />702 <br />738 <br />766 <br />798 <br />821 <br />0.186 <br />833 <br />853 <br />861 <br />879 <br />902 <br />0.391 <br />996 <br />1007 <br />1022 <br />1040 <br />1063 <br />Table 2. Calibration coefficients in Ea. 1 at 5. 10. 20. 25. and 30 °C. <br />Temper) ture <br />C <br />a <br />b (mV"') <br />C (M\1-2) <br />R2 <br />5 <br />0.28300 <br />-0.00108 <br />1.19x10 <br />0.993 <br />10 <br />0.39900 <br />-0.00142 <br />1.39x10 <br />0.994 <br />15 <br />0.43700 <br />-0.00151 <br />1.43x10 <br />0.998 <br />25 <br />0.52900 <br />-0.00172 <br />1.53x10 <br />0.999 <br />30 <br />0.55400 <br />1 -0.00178 <br />1 1.53x10 <br />0.999 <br />Tahle 3_ Thermal coefficients in En_ 2 for a_ h_ and c from Ea_ 1 _ <br />Zi <br />ai <br />Ri <br />xi <br />R2 <br />a <br />0.232 <br />0.0143 <br />-0.000122 <br />0.938 <br />b <br />-9.26 x10"4 <br />-4.43x10"5 <br />5.40x10' <br />0.929 <br />c <br />j 1.08x10 <br />j 3.00x10"8 <br />1 -5.09x10"10 <br />0.911 <br />Kv <br />