48 
WATER REQUIREMENT OF PLANTS. 
Table XXXVI. — Effect of nitrogen on the water requirement of -plants? according to 
Wimmer. 
Soil used. 
Added 
N. 
Soil 
mois- 
ture. 
Mean 
dry 
mat- 
ter. 
Water 
Crop and period. 
Plat. 
Previous fertilizer. 
Soil 
per pot. 
require- 
ment. 
Sugar beet: 
May 3 to Oct. 15, 
1899. 
Ray-grass: 
May 1 to Nov. 1, 
1903.2 
Biendorf 
Well manured 
No potash since 
1902; 0.284 gram 
P 2 5 per pot. 
Grams. 
8,058 
7,556 
Grams. 
0.224 
.336 
1.820 
.280 
.700 
.280 
.700 
Per ct. 
16 
16 
16 
12 
12 
15 
15 
Grms. 
38.2 
42.7 
79.1 
34.1 
43.8 
35.4 
52.2 
515±55 
Waldau33,34,35.. 
433 ±25 
313±3 
230 ±20 
254 ±10 
372±32 
232 ±10 
.280 
.700 
18 
18 
44.0 
53.7 
329±38 
322±10 
F 1, 3, 5, 7 
No potash since 
1902. 
7,556 
.280 
.700 
12 
12 
33.9 323 ±12 
39.6' 285 ±8 
.280 
.700 
15 
15 
44.9 
51.7 
302±12 
259 ±4 
< 
.280 
.700 
18 
18 
48.3 
57.7 
319±19 
293 ±7 
Apr. 17 to Sept. 26, 
1905. 
F33 
No potash since 
1901. 
7,768 
.280 
1.120 
12 
12 
41.5 
72.2 
406 ±5 
298±6 
Waldau87,88,89<. 
No potash since 
1903. 
8,042 
.280 
1.120 
12 
12 
39.9 
45.9 
352±19 
387 ±42 
F 6 5 
Kainit since 1902. . 
7, 808 
.280 
1.120 
12 
12 
43.0 
75.8 
373 ±35 
276 ±6 
Juetrichausand... 
0.284 gram P 2 5 
per pot. 
8,000 
.280 
1.120 
9 
9 
41.6 
80.7 
423±6 
323 ±33 
Buhlendorf sand . . 
do 
8,000 
.280 
1.120 
7 
7 
26.0 
60.7 
521 ±14 
Chicory: 
1906 
336±31 
Buhlendorf sand 6 . 
do 
8,000 
.280 
1.400 
12 
12 
48.9 
66.6 
287 ±2 
221 ±13 
0.710 gram P 2 5 
per pot. 
8,000 
.280 
1.400 
12 
12 
55.8 
63.5 
256±13 
227 ±23 
Juetricb.au sand 7 . 
0.284 gram P 2 5 
per pot. 
8,000 
.280 
1.400 
10 
10 
22.7 
10.8 
391 ±11 
676±17 
Carrot: 2 
May 5 to Oct. 30, 
1903. 
Waldau33,34,35.. 
0.710 gram P 2 O a 
per pot. 
No potash since 
1902; 0.284 gram 
P 2 5 per pot. 
8,000 
7,556 
.280 
1.400 
.280 
.700 
.280 
.700 
10 
10 
12 
12 
15 
15 
20.3 
10.7 
21.4 
22.2 
31.0 
31.0 
380 ±2 
605 ±76 
420 ±25 
362±25 
419±36 
412±14 
.280 
.700 
18 
18 
32.1 
43.8 
466±31 
1 386±16 
Fl, 3, 5, 7 
do 
7,556 
.280 
.700 
12 
12 
19.6 
17.3 
458±17 
470 ±46 
.280 
.700 
15 
15 
31.9 
28.5 
352±10 
393 ±14 
.280 
.700 
18 
18 
32.1 
44.2 
442±22 
309 ±15 
Mean of two determinations. 
1 Computed from Wimmer's data (1908, pp. 89-114). 
2 Mean of three determinations. 
s This soil contained in 1905 0.239 per cent K 2 and 0.039 per cent Na 2 0. 
* This soil contained in 1905 0.254 per cent K 2 and 0.038 per cent Na 2 0. 
& This soil contained in 1905 0.259 per cent K 2 and 0.079 per cent Na 2 0. 
6 This soil contained 0.026 per cent K 2 and 0.032 per cent Na 2 0. 
7 This soil contained 0.054 per cent K 2 and 0.051 per cent Na 2 0. 
285 
