Method and apparatus for monitoring environmental evapotranspiration
First Claim
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1. A method of estimating crop consumptive water use comprising the steps of:
- providing a means for simulating the diffusion resistance and albedo characteristics of a crop;
providing a continuous supply of liquid to said means for simulating;
exposing said means for simulating in an outdoor environment;
measuring an amount of evaporated liquid from said means for simulating; and
determining an estimated crop evapotranspiration value by comparing said measured amount of evaporated liquid to a reference amount of evaporated liquid which is correlated with an actual crop evapotranspiration value.
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Abstract
An atmometer for estimating a crop consumptive water evapotranspiration employs a green canvas colored material which is wrapped around a porcelain evaporating surface. The material simulates the albedo and diffusion resistance properties of the crop in order to provide an accurate estimation of evapotranspiration. A check valve at the bottom of the reservoir bottle helps prevent precipitation from adversely affecting the evapotranspiration estimate. Additionally, a sight glass is provided for indicating an amount of evaporated water.
29 Citations
19 Claims
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1. A method of estimating crop consumptive water use comprising the steps of:
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providing a means for simulating the diffusion resistance and albedo characteristics of a crop; providing a continuous supply of liquid to said means for simulating; exposing said means for simulating in an outdoor environment; measuring an amount of evaporated liquid from said means for simulating; and determining an estimated crop evapotranspiration value by comparing said measured amount of evaporated liquid to a reference amount of evaporated liquid which is correlated with an actual crop evapotranspiration value. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An apparatus for estimating an amount of crop consumptive water evapotranspiration comprising:
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(a) a liquid evaporating surface; (b) a covering means covering said evaporating surface for simulating the diffusion resistance and albedo characteristics of a crop; and (c) a supply means for providing a continuous liquid supply to said liquid evaporating surface. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification