Agriculture Reference
In-Depth Information
Río Piedras. Significant increasing pan evaporation was observed at Gurabo
and Adjuntas. No significant trends were observed at Fortuna, Isabela or
Corozal. A significant difference was found to exist between the mean K
p
cal-
culated with pan evaporation data from 1960 to 1980 and that with data from
1981 to 2000. An updated table of monthly average pan coefficients is provided
(Table 5) that can be used to estimate ET
pan
for the seven substations.
Additional research is needed to help explain the signifi cant reduction in
the pan evaporation observed at Lajas as compared to that of other loca-
tions. The K
p
data presented in Table 5 are valid for data obtained from the
pan located at the Lajas Experiment Station. However, if pan evaporation is
obtained from another source in the vicinity of Lajas, these data should be
compared with the experiment station evaporation data to verify consistency
between the two data sources. If large differences exist, then an adjustment
should be made in the Lajas K
p
values presented in Table 5. Further research is
also needed to investigate the reason for the observed variations in the trends
in pan evaporation (i.e., increasing at some locations and decreasing at other
locations).
KEYWORDS
•
Blaney - Criddle method
•
Crop water use
•
Reference Evapotranspiration
•
Evapotranspiration
•
Food and Agriculture Organization, FAO
•
Pan coefficient
•
Pan evaporation
•
Penman - Monteith method
•
Puerto Rico
•
Regression analysis
•
Water management
ACKNOWLEDGMENT
This research is supported by the University of Puerto Rico-Agricultural Experiment
Station Grant SP-368, NOAA-CREST and NASA-EPSCor.
REFERENCES
1. Rivera, L. E. (2004). Personal communication. UPR-Agricultural Experiment Station.
2. Goenaga, R. (1994). Growth, nutrient uptake and yield of tanier (Xanthosoma spp.) grown un-
der semiarid conditions. J. Agric. Univ. P.R. 78(3-4):87-98.
3. Goenaga, R., Irizarry, H. (1998). Yield of banana grown with supplemental drip irrigation on an
Ultisol. Expl. Agric., 34:439-448.
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