EFFECT OF SOIL FACTORS ON WATER REQUIREMENT. 
17 
cate that within the limits of this experiment different soil-moisture 
contents do not affect the water requirement of crops. The differ- 
ence in soil-moisture content was very small, usually not more than 
3 per cent. In view of this slight difference, combined with the 
uncertainty introduced by using open pots, it is not surprising that 
Wimmer's results do not show the influence of moisture content on 
the water requirement that other investigators have observed. 
Table XII.— Effect of different soil-moisture contents on the water requirement of carrots 
and ray -grass, according to Wimmer. 1 
CARROTS.* 
Year, period, and plat. Previous fertilizer. 
May 3 to Oct. 30, 1903: 
Waldau33, 34, 35. 
No potash since 1902. 
Grama. 
Fertilizer 
per pot. 
Fl,3, 5, 
, 5.36 
Grams. 
0.280N 
.280 
.280 
.700 
.70L 
.700 
.280 
.280 
.280 
.700 
.700 
.700 
Soil 
Mean 
mois- 
dry 
ture. 
matter. 
Per ct. 
Grams. 
14 
21.4 
17 
31.0 
20 
32.1 
14 
22.2 
17 
31.0 
20 
43.8 
14 
19.6 
17 
31.9 
20 
32.1 
14 
17.3 
17 
28.5 
20 
44.2 
Water 
require- 
ment. 
420±25 
419±19 
466±31 
302 ±25 
412±14 
386±16 
458±17 
352 ±10 
442±22 
470 ±46 
393 ±14 
309±15 
KAY-GRASS. * 
May 1 to Nov. 1,1903: 
Waldin 33 34 35 A" P° tesh sinc ' e 1902 ; °- 284 
< gram P 2 5 per pot. 
F 1, 3, 5, 
June 1 to Oct. 18, 1904: 
Bl< 
B3«.... 
B5<. 
E 3 
Waldau87, 88, 89. 
do. 
No potash, 1891 to 1904: 
stable manure, 1S91 to 1895; 
green manure, 1901. 
None, 1891 to 1904. 
230 ±20 
372±32 
329±38 
254±10 
232 ±10 
322±10 
323±12 
302±12 
319 ±19 
285±8 
259 ±4 
293 ±7 
302 ±1 
307 ±21 
295 ±34 
343 ±34 
266 ±3 
316±4 
302 ±8 
283±5 
322±22 
275±11 
324±3 
312±27 
365±14 
367±1 
386 ±55 
376±5 
290±17 
283 ±11 
346 ±8 
346±13 
347 ±9 
343 ±16 
321 ±11 
398 ±42 
1 Computed from Wimmer's data (1908, pp. 43-89): mean of three determinations except as noted. 
2 The same data in Table XLIII (p. 55), under "Effect of nitrogen," are recorded under 12, 15, and 18 
per cent of water, respectively. The original does not show which record is correct. 
* Each pot received 0.284 gram of P2O5 in 1903 and 1.120 grams N and 0.284 gram P 2 O d in 1904. 
4 The mean of two determinations. 
97991°— Bui. 285—13 2 
Same as B 1. 
No potash since 1901 6,397 
No potash since 1900. 
f .280 
12 
34.1 
.280 
15 
35.4 
> 7,556 
.280 
18 
44.0 
.700 
12 
43.8 
.700 
15 
52.2 
.700 
18 
53.7 
f .280 
12 
33.9 
.280 
15 
44.9 
7, 556 
.280 
18 
48.3 
.700 
12 
39.6 
.700 
15 
51.7 
.700 
18 
57.7 
15 
66.9 
18 
76.7 
I 6,766 
. 155K 2 
15 
63.6 
.155 
18 
78.5 
.776 
15 
69. 9 
.776 
18 
80.3 
15 
71.5 
18 
84.5 
6, 903 
.155 
15 
66.3 
. 155 
18 
85.9 
.776 
15 
■ 68.7 
. .776 
18 
72.9 
15 
57.0 
18 
69.4 
6, 791 
. 155 
15 
60.8 
.155 
18 
66.6 
.776 
15 
67.8 
.776 
18 
78.4 
12 
39.7 
M» 
15 
18 
12 
44.7 
49.9 
32. 8 
7,359 
15 
4.5.7 
18 
55.3 
