Determining FAO-56 crop coefficients for peanut under different water stress levels
Abstract
Accurate estimates of peanut (Arachis hypogaea L.) water requirements are needed for water conservation. The objective of this study was to evaluate the FAO-56 crop coefficients for peanut grown under various levels of water stress in a humid climate. Two experiments were conducted in three automated rainout shelters located at the University of Georgia Griffin Campus in Griffin, Georgia, USA in 2006 and 2007. Irrigation was applied when the modeled soil water content in the effective root zone dropped below a specific threshold of the available water content (AWC). The irrigation treatments corresponded to irrigation thresholds (IT) of 40, 60 and 90% of AWC. The soil water balance was used to compute observed evapotranspiration (ET cm) from measured soil water content at six different soil depths. The length of the four developmental stages was different than the values listed in FAO-56. The 2-year average absolute relative error of K cini was 8, 19 and 6% for 40, 60 and 90% IT, respectively. For the 90% IT, the FAO-56 K cmid and K cend were almost identical to the 2-year averages of the observed K cmid and K cend, respectively. The findings of this study confirmed that the FAO-56 procedure was reasonably accurate for estimating peanut ET under water stress in a humid climate.
Keywords
Soil Water Content Irrigation Treatment Crop Coefficient Rainout Shelter Water Stress LevelNotes
Acknowledgments
This work was partially supported by State and Federal funds allocated to Georgia Agricultural Experiment Stations Hatch project GEO01654 and a special grant from the US Department of Agriculture-National Institute of Food and Agriculture (NIFA).
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