VALUE OF CERTAIN NUTRITIVE ELEMENTS 
It is held by some that magnesium or calcium deficiency causes a 
disturbance in the translocation of carbohydrates and proteins and 
in their storage during seed formation, rather than an interruption 
in their synthesis, providing sufficient magnesium is present for the 
formation of chlorophyll. The results of the experiments reported 
36 
NORrl 0.1 Co 0.1 K 0.1 P 0.1 N 0.1 
CULTURE SOLUTIONS 
Figure 3. Curves showing the average yields of dry matter by plants grown 
in the normal solution and in solutions in which one nutrient element in each case 
is reduced to one tenth the normal amount. 
in the present paper quite substantially support this theory, since the 
plants in the magnesium- or in the calcium-deficient solutions grow 
vigorously until the period of seed formation. At the beginning of 
this phase of their development, however, a deficiency in magnesium 
or in calcium causes a deleterious effect and results in low grain pro- 
duction. 
A further proof that magnesium functions in some manner in 
