Water Requirement and Crop Coefficients of Young Jatropha curcas L. Trees in a Subtropical Humid Environment

AbstractLong-term and continuous crop evapotranspiration (ETc) and the crop coefficient (Kc) of jatropha (Jatropha curcas L.), which are needed to determine irrigation requirements, are lacking. The objective of this study was to measure jatropha ETc and Kc over four growing years. Field experiments...

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Bibliographic Details
Published in:	Journal of irrigation and drainage engineering Vol. 147; no. 7
Main Authors:	Lena, Bruno Patias, Folegatti, Marcos Vinícius, Flumignan, Danilton Luiz, Irmak, Suat, Francisco, João Paulo, Diotto, Adriano Valentim, Almeida Santos, Otávio Neto, de Sousa Andrade, Irineu Pedro, Junior, Eder Duarte Fanaya, Alves Marques, Patrícia Angélica, Júnior, Cícero Renê Almeida Barboza
Format:	Journal Article
Language:	English
Published:	New York American Society of Civil Engineers 01-07-2021
Subjects:	Center-pivot irrigation Coefficients Crops Drip irrigation Evapotranspiration Field tests Irrigation Irrigation requirements Jatropha curcas Technical Papers Weather stations
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Summary:	AbstractLong-term and continuous crop evapotranspiration (ETc) and the crop coefficient (Kc) of jatropha (Jatropha curcas L.), which are needed to determine irrigation requirements, are lacking. The objective of this study was to measure jatropha ETc and Kc over four growing years. Field experiments were conducted from March 2012 to August 2015, and three different irrigation treatments were evaluated. The Kc values were determined for the irrigated treatments as the ratio between the ETc and grass-reference evapotranspiration (ET0) (i.e., Kc=ETc/ET0). The ETc was determined using a directly weighing lysimeter, and agrometeorological parameters measured at a weather station were used to estimate the ET0. Over the four growing years, the ETc values ranged from 0.7 to 8.3 mm day−1 for center pivot irrigation, 0.6−7.4 mm day−1 for drip irrigation, and 0.4−5.4 mm day−1 for no irrigation (rainfed). In the first growing year, a Kc average of 0.6 for all treatments was found. The highest Kc values were obtained at midphase (from December to February), with values of 0.9 and 0.8 in the second growing year, respectively, for the center pivot and drip treatments. During the same growth phase for the third and fourth growing season, the Kc for both irrigated treatments were averaged at 0.9.
ISSN:	0733-9437 1943-4774
DOI:	10.1061/(ASCE)IR.1943-4774.0001557