EFFECT OF SOIL FACTORS OX WATER REQUIREMENT. 
47 
Table XXXV. — Effect of potash on the water requirement of plants. 1 according to 
Wiynmer. 
Soil used. 
K 2 
Soil 
mois- 
ture. 
^rv 1 JB« 
ma t- require- 
«£ ment - 
Crop and period. 
Plat. 
Previous fertilization. 
Potash and -p.,. 
soda by 5f r 
analysis. J""" 
added 
per 
pot. 
Rav-grass -2 
"June 1 to Oct. 18, 1904. 
Bl 
No potash. 1891 to 1904.. 
Stable manure. 1891 to 
1895. Green manure. 
1901. 
Per cent. Grms. 
0. 247 K 2 6, 766 
. 045 Na 2 
Grms. 
6. 155 
.776 
".155 
.776 
Perct. 
15 
15 
15 
IS 
18 
18 
Grm.s. 
66.9: 302±1 
63.6 301 ±39 
69.9 266±3 
76.7 307 = 21 
7S.5 343 ±34 
90.3 316±4 
B3 
None. 1891 to 1904 
. 251 K 2 6, 903 
. 050 Na 2 
. 155 
.776 
15 
15 
15 
71.5 302±8 
66.3 322=22 
68.7 324 ± 3 
. 155 
.776 
18 
18 
18 
84.5 
85.9 
72.9 
283-5 
275 ±11 
312±27 
B5 
No potash. 1891 to 1904. . 
Stable manure. 1891 to 
1895. Green manure. 
1901. 
. 295 KiO 
. 090 Na 2 
6. 791 
. 155 
. 776 
".155 
.776 
15 
15 
15 
18 
18 
18 
57.0 
60.8 
67.8 
69.4 
66.6 
78.4 
365±14 
386±55 
290±17 
367±1 
376±5 
283 + 11 
Apr. 17 to Sept. 26, 
1905. 
B3 
None, 1901 to 1905 
.244K 2 Q 7.919 
. 044 Na 2 
"."iso 
.776 
15 
15 
15 
92.4 
93. 8 
92.5 
313±4 
306±21 
310±7 
. 155 
.776 
18 
18 
18 
95.6 
98.7 
100.4 
333±17 
336±1 
350±16 
F3 
do 
. 239 KjO 
. 039 Na : 
7, 76^ 
. 155 
.776 
. 155 
.776 
15 
15 
15 
18 
18 
18 
90.0 305 = 13 
88.4 319±32 
90.0 312±17 
113.4 290±4 
104.3 303 ±7 
102.1 311 ±7 
H3 
No potash, 1902 to 1905.. 
. 221 K 2 
. 061 Na 2 
7.344 
. 155 
.776 
15 
15 
15 
80.2 341 ±32 
84. 7| 311±11 
96.2 262 ±9 
.776 
18 
18 
18 
90.6 
93.5 
95.9 
345±12 
369=7 
331 = 3 
May 3 to Nov. 12, 1906. 
B5 
None. 1891 to 1904 
Stable manure. 1891 to 
1895. Green manure. 
1901. 
. 259 K 2 
. 068 Na 2 
7.000 
- 155 
.776 
1.551 
18 
18 
18 
18 
61.2 
50.8 
64.9 
65.4 
229=17 
279=12 
235±3 
202-7 
G3 
No potash, 1902 to 1906. . 
18 
18 
18 
18 
64.7 
65.4 
60.1 
65.0 
21S±8 
.155 
.776 
1.551 
230±10 
22S±6 
228 ±35 
FS 
Potash. 1901 to 1906 
18 
18 
IS 
IS 
55.4 245-4-11 
.155 
.776 
1.551 
55.3 
52.8 
66.9 
316±64 
282±32 
211 = 34 
1 Computed from Wimmer*s data (1908, pp. 15-37). Mean of two determinations. 
2 Each pot received 0.840 gram N and 0.284 gram P 2 5 in 1904, and 1.120 grams N and 0.284 gram P 2 5 in 
1905. 
3 Each pot received 1.400 grams N and 0. 710 gram P 2 5 . 
285 
