Transpiration as a Factor in Crop Production. 
121 
Table 45. — Weekly 1 summary of evaporation from free water sur- 
faces 36 square inches in area, at five elevations in a cornfield. 
1913. 
Av. daily 
Elevation of evaporating surface above ground 
Average 
evaporation 
of five 
for week 
elevations 
ending 7 p. m. 
0 ft. 
3.5 ft. 
6 ft. 
8 ft. 
10 ft. 
Grams 
Grams 
Grams 
Grams 
Grams 
Grams 
(1) 
(2) 
(3) 
(4) 
(5) 
(6) 
(7) 
July 7 
206 
384 
439 
472 
486 
397 
14 
197 
323 
440 
466 
520 
o on 
389 
" 21 
203 
290 
425 
481 
495 
379 
" 28 
124 
178 
285 
340 
542 
294 
Aug 4 
127 
216 
352 
411 
415 
304 
" 11 
160 
250 
398 
487 
484 
356 
" 18 
162 
211 
366 
432 
447 
324 
" 25 
151 
196 
306 
357 
368 
276 
Sept 1 
191 
256 
408 
484 
496 
367 
" 8 
204 
283 
440 
529 
539 
399 
Average 
172.5 
259 
386 
446 
479 
348.5 
1 The corn was planted May 25 and had made considerable growth when 
the test was started. 
Table 46. — Weekly 1 summary of evaporation from free water sur- 
faces of 36 square inches in area, at five elevations in a corn- 
field. 191 4. 
Av. daily 
Elevation of evaporation surface above ground 
evaporation 
Average 
for week 
of five 
ending 7 p. m. 
0 in. 
36 in. 
68 in. 
96 in. 
120 in. 
elevations 
Grams 
Grams 
Grams 
Grams 
Grams 
Grams 
(2) 
(3) 
(4) 
(5) 
(6) 
(7) 
June 28 
128 
183 
284 
340 
364 
260 
July 5 
105 
113 
183 
213 
224 
168 
" 12 
90 
142 
200 
278 
305 
203 
" 19 
103 
132 
177 
270 
280 
192 
" 26 
61 
99 
150 
237 
259 
161 
Aug 2 
61 
99 
139 
223 
238 
152 
" 8 
81 
142 
199 
329 
359 
222 
" 16 
84 
114 
175 
303 
329 
201 
" 23 
109 
175 
231 
356 
393 
253 
" 30 
79 
104 
134 
196 
191 
141 
Sept 6 
89 
147 
186 
272 
283 
195 
Average 
90 
132 
187 
274 
293 
195.2 
1 The corn was planted May 26 and had made considerable growth when 
the test was started. 
