216 
Smith and B tit lev. — Relation of 
several cultures is shown in Table XXVI. It will be noticed that the ratio of 
top weight to root weight is not affected by potassium starvation, but that 
serious loss of weight of the plant as a whole results when potassium is 
withheld for a longer period than three days. 
Table XXVI. Effect of delayed additions of potassium on the growth of 
Early pedigree Dent field Corn in water culture. 
Nutritive solution 
No . of 
Total weii . 
ft of plants . 
Weig 
r ht of 
Ratio oj 
used . 
plants . 
Green . 
Dry . 
Tops . 
Roots . 
tops to 
roots . 
Grm. 
Grm. 
Grm. 
Grm. 
Solution F. Potassium 
3 
35 * 3°5 
4.2784 
2.7996 
1. 1300 
present from begin- 
3 
40.950 
3.9296 
3.0881 
1-1903 
ning. 
3 
30.821 
3-5257 
2.5138 
1-0119 
3 
28.592 
3-3369 
2.2564 
1.0805 
Mean 
1 
11.306 
I,2 559 
0.8882 
0.3677 
2.42 
Solution F, less potas- 
3 
37-957 
4.3846 
2.8224 
1.0561 
sium. Potassium 
3 
33-737 
4.0899 
2.6418 
1.1078 
added after 3 days. 
3 
32.863 
3-7885 
3- 1 555 
1. 2291 
3 
36-586 
3.7496 
2.8255 
1.2644 
Mean 
1 
1 1.762 
I, 34 I 9 
0.9538 
0.3881 
2-45 
Solution F, less potas- 
3 
35.221 
3.6672 
2-5523 
1. 1149 
sium. Potassium 
3 
28-940 
3-0979 
2-3061 
0.7918 
added after 6 days. 
3 
35-595 
3.8670 
2.9291 
0.9379 
3 
32.179 
3-3678 
2-5317 
0-8361 
Mean 
1 
10.995 
1. 1666 
0.8599 
0.3067 
2-8i 
Solution F, less potas- 
3 
22.909 
2-9755 
2-2008 
o-7747 
sium. Potassium 
3 * 
24-337 
2-7349 
1.8901 
0.8448 
added after 9 days. 
b 
23-835 
2.8934 
2.0492 
0-8442 
3 
26-051 
2.7764 
2-0442 
0.7322 
Mean 
i 
8.094 
0.9483 
0-6820 
0-2663 
2.56 
Solution F, less potas- 
3 
17.960 
2.0709 
1-5020 
0.5689 
sium. Potassium 
3 
10.644 
1.2989 
0.9887 
0-3102 
added after 12 days. 
3 
I 4-938 
1.5788 
1.1697 
0-4091 
3 
19.266 
2.3177 
1.7147 
0-6030 
Mean 
1 
5-234 
0.6055 
0.4479 
0.1576 
2.84 
Solution F. Potas- 
3 
2.480 
0.5067 
0.3720 
0.1356 
sium absent. 
3 
4-333 
0.7630 
0-5583 
0-2047 
3 
6.769 
0-9881 
0-7191 
0-2690 
3 
3-999 
0-7024 
0-5232 
0.1792 
Mean 
1 
1.465 
0.2467 
0-1810 
0.0657 
2-75 
