604 



Journal of Agricultural Research 



Vol. VI. No. i 



of growth was only 42 days. This is due chiefly to the extensive de- 

 velopment of roots, making it possible to utilize more of the small quan- 

 tities of calcium and magnesium remaining in the extracted sand, for in 

 the other pots where these two elements were added such striking differ- 

 ences do not occur in the different crops. 



To each pot receiving 15 alfalfa seeds, 0.19 mgm. of calcium and 0.32 

 mgm. of magnesium were added in the seed, and for the three crops 

 164.5 nigm. of calcium and 90.72 mgm. of magnesium were removed. 

 This indicates to what extent the- plants may attack relatively insoluble 

 compounds. 



X. A nalysis of alfalfa grown in soil, dolomite, and magnesite series H 

 ALFALFA, FIRST CROP 



ALFALFA, SECOND CROP 



ALFALFA, THIRD CROP 



