EFFECT OF SOIL FACTORS OX WATER REQUIREMENT. 
41 
Table XXX. — Effect of different amounts of potash on the water requirement of crops, 
according to Wilfarth and Trimmer yl902. pp. 10-15) — Continued. 
Crop and period. 
Soil, etc., per pot. 
Fertilizer per pot. 
Mean 
dry mat- 
Mean 
water 
K 2 0. 
X. 
require- 
ment. 
White mustard: 1 
Apr. 12 to July 13, 1<97 
/Sand, 2,350 grams: turf, 150 
\ grams: water, 625 grams. 
(Sand, 2.500 grams: turf. 160 
\ grains; water, 665 grams. 
(Sand, 4,000 grams; water, 
\ 700 grams. 
do 
Grams. 
f 0.047 
1 .094 
.188 
| . 376 
Grams. 
0.700 
.700 
.700 
.700 
.084 
.084 
.224 
.224 
.700 
.700 
.700 
.700 
.700 
.700 
.700 
.112 
.112 
.252 
.252 
.420 
.420 
.420 
.420 
.140 
.140 
.2S0 
.2S0 
1.680 
1.680 
1.680 
1.680 
.084 
.084 
.224 
.224 
.420 
.420 
.420 
.420 
Grams. 
14.1 
25.6 
35.8 
37.3 
5.3 
4.2 
11.6 
12.2 
13.4 
21.6 
26.5 
29.1 
5.1 
13.9 
23.2 
6.5 
11.2 
12.3 
19.2 
8.8 
14.6 
14.6 
30.4 
14.5 
12.1 
28.4 
30.0 
16.3 
52.2 
77.4 
S3. 2 
8^8 
12.9 
18.8 
7.9 
14.0 
18.8 
22.3 
848±26 
651±6 
511-30 
49>=21 
1.1X3-179 
Apr. 19 to July 26, 1900 
.376 
.047 
.376 
1,193±8 
741-9 
718±14 
W7±fi 
Buckwheat: s 
.047 
. 1175 
. .564 
f 
659±50 
562±H 
500±8 
920 
Apr. 14 to July 16, 1S97 
.047 
I .141 
3 494±12 
3 417 = 10 
996±83 
Apr. 23 to Julv 26, 1900 
.564 
.047 
.564 
709±3 
746 
554±25 
iSand, 4,465 grams; turf, 285 
\ grams: water, 1,190 grams. 
/Sand, 4,000 grams; water, 
\ 700 grams. 
Chicory, Magdeburg: 4 
Apr. 28 to Nov. 17, 1900 
.047 
.141 
.564 
f .0235 
3.290 
.2S2 
3.290 
.0235 
.2^2 
.846 
3.290 
776 ±4 
772±0 
415±18 
jB±| | 
790±55 
455 = 22 
405 ±49 
679 ±59 
331±33 
2.54=12 
217±8 
1,095±27 
948±20 
813 ±16 
674 ±6 
1,017±26 
B06±0 
'-.---10 
615±2 
Oats: 5 
Apr. 23 to Aug. 6, 1900 
.376 
.047 
.376 
.047 
.1175 
.376 
i Computed from data of Wilfarth and Wimmer (1902, pp. 64-65). DupUcate determinations were made. 
The dry matter includes the roots. (See Wilfarth and Wimmer, 1902, pp. 62-63, form D, for a complete 
record of the fertilizers used with mustard.) 
2 Computed from data of Wilfarth and Wimmer (1902, pp. 54-55). DupUcate determinations were made 
excep t where no probable error is given, in which case only one determination was made. The drv matter 
includes the roots. (See Wilfarth and Wimmer, 1902, pp. 52-53, form C, for a complete record of the fer- 
tilizers used with buckwheat.) 
3 Mean of four determinations. 
4 Computed from data of Wilfarth and Wimmer (1902, pp. 74-75). Duplicate determinations were made. 
The dry matter includes the roots. (See Wilfarth and Wimmer, 1902, pp. 72-73, form E, for a complete 
record of fertilizers used with chicory.) 
5 Computed from data of Wilfarth and Wimmer (1902, pp. 82-83). DupUcate determinations were made. 
The dry matter includes the roots. (See Wilfarth and Wimmer, 1902, p. 81, form F, for a complete record 
of the fertilizers used with oats.) 
The effect of different amounts of potash on potatoes is shown in 
Table XXX. The first series of experiments conducted in 1897 and 
those conducted hi 1898 show without exception a reduction in the 
water requirement when potash is increased. The second series in 
1897 is included here, but since both nitrogen and potash were increased 
the lower water requirement can not be attributed to potash alone. 
The results of 1899 and 1900 showed first a decrease and later an 
increase in the water requirement when the potash was increased. 
