July 17, 1916 Influence of Calcium and Magnesium on Plant Growth 599 



carbonates limestone was i .62 times as soluble as dolomite and more than 

 3 times as soluble as magnesite. 



Applications of dolomite Ci up to 40 per cent caused no injury to 

 either wheat or alfalfa. 



Table IV shows the treatments and yields of series C and D. Analyses 

 of these plants are reported in Table V. Series C (wheat) was harvested 

 83 days after planting and series D (alfalfa) was harvested 84 days after 

 planting. 



From Table V it can be seen that wheat grown in soil (pots 41 and 42) 

 shows 0.279 per cent of calcium and 0.256 per cent of magnesium, but 

 when grown in extracted sand (Table III, pots i and 2) it had only 0.187 

 per cent of calcium and 0.108 per cent of magnesium, showing that there 

 is a decided tolerance for these two elements. By comparing the wheat 

 with the alfalfa it can be seen that, while alfalfa is a heavier feeder than 

 wheat on calcium and magnesium, the proportional amounts of calcium 

 are greater in alfalfa than in wheat. 



TABLE V. Analysis of wheat and alfalfa grown in brown silt loam series C and D 



WHEAT STRAW 



WHEAT ROOTS 



ALFALFA HAY 



ALFALFA ROOTS 



