July i 7 , 1916 Influence of Calcium and Magnesium on Plant Growth 61 1 



TABLE XVIII. Analysis of soybeans grown after alfalfa in soil, magnesite, and sand 



series N 



The percentages of calcium and magnesium were greater in the plants 

 harvested in the earlier stages of growth. In the wheat the proportion 

 of magnesium to calcium was somewhat greater in the later stages of 

 growth. Still it must be remembered that the plants were by no means 

 thoroughly matured. This was not the case with the soybeans, as is 

 shown by Table XX. Soybean plants at maturity, or 80 days after 

 planting, showed higher percentages of calcium and magnesium than at 

 the end of 53 days of growth, except the checks in sand and those having 

 had extremely small applications. 



TABLE XIX. Composition of wheat at different stages of growth 



