18 
Table VIII. — Percolation as a 
by salts and fertilizers . 
Salts and fertilizers. 
Soil 
Soil 
Soil 
No. 
No. 
No. 
530. 
573. 
428. 
Soil 
No. 
516. 
Time of experiment. 
6 
7 
2f 
days. 
days. 
days. 
Cc. 
Cc. 
Cc. 
1,757 
1,316 
9,212 
3,543 
1,265 
5,300 
2,602 
1,546 
4,044 
3,824 
1,555 
2,985 
940 
1,939 
2,134 
661 
1,564 
2,516 
1,902 
1,484 
2,795 
2,008 
1,504 
2,166 
4 
days. 
Salts and fertilizers. 
Soil 
Soil 
Soil 
No. 
No. 
No. 
530. 
573. 
428. 
Soil 
No. 
516. 
Time of experiment. 
days. 
7 
2f 
days. 
days. 
Cc. 
Cc. 
1,413 
2,349 
1,628 

1,253 
3,545 
1,787 
3,601 
1,189 
3,445 
1,452 
5,0.38 
1,530 
6,612 
4 
days. 
Potassium sulphate 
Potassium chlorid 
Potassium phosphate 
Calcium oxid 
Calcium sulphate 
Calcium carbonate 
Calcium phosphate 
Magnesium oxid 
Cc. 
2,312 
4,123 
3,077 
4,851 
5,635 
4,569 
5,489 
5,093 
Magnesium sulphate. 
Blank 
Sodium phosphate. . . 
Sodium carbonate . . . 
Sodium nitrate 
Ammonium chlorid.. 
Ammonium sulphate 
a. 
1,838 
8 
1,765 
2,021 
4,481 
4,162 
488 
Co. 
3,404 
7,086 
3,293 
2,633 
1,649 
3,355 
2,987 
Superphosphate . 
Phosphate rock 
Cottonseed meal 
Blood 
Blood and acid phos- 
phate 
Blank 
Blood and potassium 
sulphate 
7 
days. 
Cc. 
1,688 
4,784 
1,990 
2,432 
1,892 
1,476 
5,865 
4,753 
7 
days. 
Cc. 
1,940 
1,588 
1,675 
1,443 
1,456 
1,567 
1,710 
1,423 
40 
hours. 
Cc. 
2,568 
3,256 
2,546 
1,924 
4,027 
2,012 
11,936 
3,526 
3 
days. 
Cc. 
1,581 
3,632 
3,902 
4,659 
3,656 
3,324 
2 7,226 
1,715 
Potassium sulphate and 
acid phosphate 
2(NH4)-14-2 3 
1(NH4)-^13 , 
4(NH4)-11-10 3 
4.5(NH4)-23-0 3 
2(N03)-14-24 , 
Acid phosphate 
7 
7 
40 
days. 
days. 
hours. 
Cc. 
Cc. 
Cc. 
3,491 
1,321 
2,693 
2,305 
1,618 
1,945 
3,685 
1,636 
3,852 
2,763 
1,331 
1,365 
3,198 
1,381 
2,076 
3,745 
1,480 
2,044 
3,209 
1,649 
1,308 
3 
days. 
Cc. 
4,631 
4,060 
2,847 
3,239 
4,826 
5,006 
2,456 
1 Stopped after 2f days. 
2 Stopped after 2 days. 
' Fertilizer m.ixtures supplying nitrogen (in ammonium sulphate), phosphoric acid, and potash in the 
order and proportions (percentages) given. 
4 Fertilizer mixture similar to those referred to in footnote 3 except that nitrogen was supplied in 
sodium nitrate. 
A glance at this table clearly indicates the complexity of the study 
of the passage of water through soils. It is quite generally conceded 
that those soils in which capillary activity is greatest offer the least 
resistance to the passage of water. Soil No. 573 fails to lend sup- 
port to this theory, as does also No. 516. In these soils the capillary 
activity is greatest, while they offer much greater resistance to the 
passage of water than the sandy soils. Even the heavy clay soil 
offers less resistance than No. 573. 
As a whole the calcium salts cause less resistance than magnesium 
salts, ammonium less than potassium, chlorids less than sulphates in 
clay soils, but the sulphates least in organic soils. Mixtures in which 
sodium nitrate is used cause less resistance to flow of water than 
where ammonium salts were used. 
Soil No. 530. — All the salts and fertilizers added to this type 
retarded the percolation of water. There is a sHght relation between 
the degree of resistance and the flocculating power of the salts. As a 
rule the most deflocculated samples were among those that offered 
the greatest resistance and vice versa, as was found by exa minin g 
