17, 6 Trelease: Salt Requirements of Wheat Plants 577 
V = High yields 
(J =Low yields 
1 part KH,PO, 1 part KH, PO, 
Fic. 9. Diagram for series III, showing dry yields of roots. 
amount of this salt is increased. Thus in triangle 2, where only | 
0.2 of the total concentration is due to potassium chloride, this 
area of injury is confined to the left margin; it extends somewhat 
more to the right in triangle 7; and occupies the left half of the 
diagram in triangles 8 and 9. In the last two cases potassium 
é 
