i6 
Journal of Agricultural Research 
Vol V, No. i. 
but they are all more toxic than the sodium sulphate and sodium car¬ 
bonate. Magnesium chlorid seemed to be the least toxic of the chlorids 
that were tested. Germination in all of them fell off rapidly above 4,000 
p. p. m. 
Check® No Salt 
• — One plant — = 0.1 gm. dry matter. 
Fig. 3.—Diagram showing the number of wheat plants up and dry matter produced in 24 days on Green¬ 
ville loam with calcium chlorid, magnesium chlorid, and potassium chlorid in different combinations 
and concentrations. 
In figure 4 the nitrates of sodium, potassium, and magnesium are 
compared and the sodium found to be slightly more toxic than the others. 
The nitrates appear on the whole to be somewhat less toxic than the 
chlorids, but more so than the sulphates or carbonates. 
Check® No Salt 
• =s One plant — = 0.1 gm. dry matter. 
Fig. 4.—Diagram showing the number of wheat plants up and dry matter produced in 24 days on Green¬ 
ville loam with potassium nitrate, magnesium nitrate, and sodium nitrate in different combinations and 
concentrations. 
The results for the sulphates of sodium, potassium, and magnesium are 
given in figure 5. There was practically complete germination with all of 
the sulphates up to a concentration of 1 per cent; hence, but little differ¬ 
ence in the three salts can be seen. 
