Abstract
An infrared thermometer measured the temperature of irrigation water flowing in furrows in fields of corn and onions. The temperature increased as much as 228 C from inflow to downstream ends of the field during mid-afternoon. This temperature increase reduces the viscosity of the water sufficiently to increase the hydraulic conductivity by 70%. Computer simulations determined the effect of measured temperature increases on cumulative infiltration and on distribution of infiltrated water during a hypothetical irrigation. For the case studied, the elevated downstream temperature improved the uniformity of infiltrated water down the furrow.
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