Oct. 4, 1915 
Effect of Alkali Salts in Soils on Crops 
13 
along the sides contained a mixture of two salts, while the glasses in the 
center contained all three salts in the proportions indicated. 
It will be noted that the top glass (O) contained 100 per cent of sodium 
chlorid, the second row, with glasses M and N, 75 per cent of sodium 
chlorid, the third row, with glasses J, K, and L, 50 per cent of sodium 
chlorid, the fourth row, with glasses F, G, H, and I, 25 per cent of sodium 
chlorid, while the bottom row contained no sodium chlorid. The same 
order is followed with each of the other salts. Thus, there are glasses 
with each of the single salts, others with two salts in various combina¬ 
tions, and still others with all three salts in different proportions. From 
this arrangement it is possible to determine the effects of the single 
salts as well as the various combinations of salts. 
In order to find the effects of the concentration of salts, 10 different 
concentrations were tried for each three salts. These varied from 1,000 
to 10,000 p. p. m. of salt based on the dry soil. The combination of salts, 
as well as the soils and crops, are given in Table VIII. 
Table VIII .—Combinations of salts t soils , and crops used in concentration experiments 
Trial 
No. 
Combination of salts. 
Soil. 
Crop. 
1 
Sodium chlorid, sodium sulphate, sodium carbonate.. 
Greenville loam. 
New Zealand wheat. 
2 
Potassium chlorid, calcium chlorid, magnesium chlo¬ 
rid. 
.do. 
Do. 
3 
Sodium nitrate, potassium nitrate, magnesium ni¬ 
trate. 
Do. 
4 
Sodium sulphate, potassium sulphate, magnesium 
sulphate. 
Do. 
S 
Potassium carbonate, sodium carbonate, ammonium 
carbonate (NHOaCCb.® 
.do.; 
Do. 
6 
Sodium chlorid, sodium sulphate, sodium carbonate.. 
Coarse sand. 
Do. 
7 
Potassium chlorid, calcium chlorid, magnesium 
chlorid. 
Do. 
8 
Sodium nitrate, potassium nitrate, magnesium ni¬ 
trate. 
Do. 
9 
Sodium sulphate, potassium sulphate, magnesium 
sulphate. 
Do. 
10 
Potassium carbonate, sodium carbonate, ammonium 
carbonate. 
Do. 
11 
Sodium chlorid, sodium sulphate, sodium carbonate.. 
College loam. 
Do. 
12 
Potassium chlorid, calcium chlorid, magnesium chlo¬ 
rid. 
Do. 
13 
Sodium nitrate, potassium nitrate, magnesium ni¬ 
trate. 
Do. 
14 
Sodium sulphate, potassium sulphate, magnesium 
sulphate. 
.do. 
Do. 
IS 
Potassium carbonate, sodium carbonate, ammonium 
carbonate. 
.do. 
Do. 
16 
Sodium chlorid, sodium sulphate, sodium carbonate.. 
Greenville loam. 
Chevalier barley. 
17 
Do. 
White flint corn. 
1 1 
18 
IO 
Do. 
Danish oats. 
Do. 
.do. 
Sugar beets. 
Alfalfa. 
*7 
20 
Do. 
.do. 
21 
Do. 
Canada field peas. 
22 
Do. 
Distilled water. 
New Zealand wheat. 
23 
Potassium chlorid, calcium chlorid, magnesium 
chlorid. 
.do. 
Do. 
24 
Sodium nitrate, potassium nitrate, magnesium ni¬ 
trate. 
Do. 
<* The ammonium carbonate used has the formula (NHO^CMNHOaCOaNHa, but the simpler formula, 
(NHO2CO3, is used for convenience. 
