Agriculture Reference
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TABLE 4 Average monthly pan evaporation (E pan ) based on 1981 through 2000 pan
evaporation data for seven experimental substations.
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Adjuntas
93
100
128
132
136
138
146
139
124
112
92
84
Corozal
76
80
110
115
128
127
129
127
112
101
78
70
Fortuna
104
107
139
147
157
156
166
159
141
124
100
96
Gurabo
87
93
121
128
133
131
135
132
117
105
85
80
Isabela
94
100
132
141
146
141
145
144
129
118
95
88
Lajas
97
102
138
145
162
162
164
157
137
120
95
87
Río Piedras
93
98
130
138
145
143
146
142
127
116
93
86
Average
93
100
128
132
136
138
146
139
124
112
92
84
TABLE 5 Pan Coefficients (K p ) based on 1981 through 2000 pan evaporation data, for
seven experimental substations.
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Adjun-
tas
1.02
1.05
1.05
1.03
1.04
0.97
1.04
1.02
1.00
1.00
0.99
0.98
Coro-
zal
0.84
0.80
0.85
0.85
0.94
0.86
0.85
0.87
0.92
0.88
0.87
0.81
For-
tuna
0.68
0.67
0.72
0.74
0.81
0.78
0.78
0.76
0.80
0.77
0.72
0.69
Gu-
rabo
0.74
0.77
0.78
0.77
0.80
0.74
0.77
0.77
0.80
0.79
0.77
0.76
Isabela
0.84
0.84
0.86
0.86
0.95
0.92
0.89
0.91
0.97
0.93
0.88
0.82
Lajas
1.08
1.10
1.15
1.14
1.17
1.22
1.25
1.16
1.02
1.10
1.08
1.07
Río
Pie-
dras
0.95
0.90
0.92
0.90
1.00
0.95
0.91
0.96
0.97
0.95
0.93
0.92
8.4 SUMMARY
The objective of the research in this chapter was to update pan evaporation coeffi-
cient (K p ) values for the seven University of Puerto Rico - Agricultural Experimental
Substations, based on updated pan evaporation data and the Penman-Monteith refer-
ence ET. Therefore, historical pan evaporation data for seven experimental substa-
tions were evaluated to determine whether increasing or decreasing trends
 
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