22 
Journal of Agricultural Research 
Vol. V, No. i 
COMPARISON OF CROPS 
In the management of alkali land it is important to know the relative 
resistances of various crops. Farmers who have been accustomed to 
deal with alkali are well aware that certain crops can be made to grow 
where others would be a complete failure. 
ChQCK^NoSiHt 
coooppm. loooppm. zoooppm. wooppm.; to.oooppm 
• — One plant. — — 0.1 gm. dry matter. 
Fig. 15.—Diagram showing the number of wheat plants up and dry matter produced in 16 days on College 
loam with potassium sulphate, magnesium sulphate, and sodium sulphate in different combinations and 
concentrations. 
NaC/ 
ChecK^NoSalt 
6.000 ppm. 7.000 ppm. 6.000 ppm *000 ppm.. ro.oooppm. 
. = One plant, — — 0.1 gm. dry matter. 
Fig. 16.—Diagram showing the number of wheat plants up and dry matter produced in 16 days on College 
loam with ammonium carbonate, sodium carbonate, and potassium carbonate in different combinations 
and concentrations. 
A number of the common field crops were tested in the manner already 
described. Greenville soil was placed in glass tumblers and sodium 
chlorid, sodium sulphate, and sodium carbonate added in the same 
combinations and concentrations previously used. Ten seeds were 
