| 摘要 |
<p>The present invention provides systems and methods in which an irrigation controller (200) uses a regression model (140) that has applied to it a current temperature value to arrive at a first estimated evapotranspiration rate (estimated ETo 1)(320), uses a current cloud cover value to modify the estimated ETo 1 to arrive at a second estimated evapotranspiration rate (estimated ETo 2)(340), and uses the estimated ETo 1 or estimated ETo 2 along with other factors, such as crop coefficient and irrigation efficiency to affect an irrigation schedule executed by the controller (200). The temperature can represent air temperature or soil temperature. The current temperature values and cloud cover values may enter the controller (200) from a local sensor (294, 295), a distal signal source, or both.</p> |
