22 Journal of Agricultural Research voI.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. 



VarSO. 



' ♦ iQooppm. 5 *• zpooppm. zoooppm. 4.oooppm. Sfioopptn. 



Oteck^NoSalt 



loooppm. 6.oooppm 



— = 0.1 gm. dry matter. 



Fig. is. — Diagram showing the number of wheat plants up and dry matter produced in i6 days on College 

 loam with potassium sulphate, magnesium sulphate, and sodium sulphate in different combinations and 

 concentrations. 



s.oooppm d.oooppn. s.oooppm. 



Check^NoSalt 



feoooppm zoooppm e.oooppm. ioooppm w.oooppm. 



. = One plant. — = 0.1 gm. dry matter. 



Fig. i6.— Diagram showing the number of wheat plants up and dry matter produced in i6 days on College 

 loam with ammonium carbonate, soditim 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 



