i6 



Journal of Agricultural Research 



Vol V, No. 



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. 



KCl 



CaCli loooppm^S^'^ zjaooppm. s.oooppm. 4.oooppm. 



Check^NoSalt 



s.oooppm. 



i.oooppm lOQoppm. 6.oooppm ioooppm looooppm 



. = 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. 



loooppm 



^iOfo,l 



2,oooppm. 3.oooppm Aoooppn. 



cnecX^NoSait 



i^ooopprn. 



i.oooppm loooppm. 6.oooppm. gvooppm. icoooppm. 



. = 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 i per cent; hence, but little differ- 

 ence in the three salts can be seen. 



