| dc.creator |
Martínez-Cob, Antonio |
|
| dc.date |
2008-02-27T08:51:42Z |
|
| dc.date |
2008-02-27T08:51:42Z |
|
| dc.date |
2008 |
|
| dc.date.accessioned |
2017-01-31T01:00:26Z |
|
| dc.date.available |
2017-01-31T01:00:26Z |
|
| dc.identifier |
Irrigation Science 26: 335-345 (2008) |
|
| dc.identifier |
1432-1319 (electronic version) |
|
| dc.identifier |
http://hdl.handle.net/10261/3097 |
|
| dc.identifier |
DOI 10.1007/s00271-007-0097-5 |
|
| dc.identifier.uri |
http://dspace.mediu.edu.my:8181/xmlui/handle/10261/3097 |
|
| dc.description |
The definitive editor version is available at: http://link.springer.com/journal/271
http://www.springerlink.com/content/h7270424k3j76459/ |
|
| dc.description |
Two crop coefficient equations were derived as a function of fraction of thermal units from lysimeter measured corn evapotranspiration (ETc-lys) during 1997 and 1998, and reference evapotranspiration obtained from: a) lysimeter measurements (Kcmes) or FAO Penman-Monteith (ETo-PM) estimates (Kcest-PM). For validation, corn evapotranspiration (ETc-est) was estimated in 2005 and 2006 from ETo-PM and: a) the equation for Kcmes with (ETc-est-lyslc) or without (ETc-est-lys) locally calibrated ETo-PM; b) the equation for Kcest-PM; and c) the FAO approach (ETc-est-FAO). The ETc-est_lys estimates showed the lowest bias (0.09 mm day-1); the ETc-est-PM and ETc-est-FAO, the highest (0.50-0.51 mm day-1). However, the root mean square error (RMSE, 1.23-1.27 mm day-1) and the index of agreement (IA, around 0.94) of the ETc-est-lys, ETc-est-lyslc and ETc-est-PM were similar. Therefore, ETc-est-lys is recommended although the ETc-est-lyslc was almost as accurate. The ETc-est-PM is less recommended due to poorer bias and systematic mean square error, and a general underestimation except for low corn ET values. For real time irrigation scheduling, the ETc-est-FAO should be avoided as RMSE (1.35 mm day-1), IA (0.93) and bias were slightly worse, corn ET was overestimated but for high values, and the length of the four phenological stages must be known in advance. |
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| dc.description |
This research has been funded through projects HID96-1295-C04-04 and AGL-2004-06675-CO3-02 (Spanish Ministry of Education), and PIP090/2005 (Regional Government of Aragón). |
|
| dc.description |
Peer reviewed |
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| dc.format |
185086 bytes |
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| dc.format |
application/pdf |
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| dc.language |
eng |
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| dc.publisher |
Springer |
|
| dc.relation |
http://dx.doi.org/10.1007/s00271-007-0097-5 |
|
| dc.rights |
openAccess |
|
| dc.subject |
Evapotranspiration |
|
| dc.subject |
Irrigation |
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| dc.subject |
Water requirements |
|
| dc.subject |
Crop coefficient |
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| dc.subject |
Lysimetry |
|
| dc.subject |
Corn |
|
| dc.title |
Use of thermal units to estimate corn crop coefficients under semiarid climatic conditions |
|
| dc.type |
Artículo |
|