July i 7> i 9 i6 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 



Pot No. 



t. 



239 

 241 



243 

 246 



248 

 250 



25 1 

 252 



2 54 



Composition of plants. 



Mgm. 

 7. 02 

 109. 76 

 131. O 



90. 28 

 76.62 

 82.83 

 29.04 



32.83 

 46. 96 



Per cent. 



0. 54 



1. 96 

 I.82 

 I.48 

 I. 225 

 I.225 



. 726 



.864 



I. 236 



Magnesium. 



Molecular 

 ratio of 

 calcium 

 to mag- 

 nesium. 



Mgm. 

 4.6 

 41. 



Per cent. 

 °-354 

 .741 

 •732 

 •785 

 •745 

 1. 19 



•985 

 1.496 



•835 



5-4 

 3-i 

 3-3 

 4.4 



5-i 



7-9 



i-3 



14.4 



5-6 



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 



Treatment. 



None 



Percentage of magne- 

 sium in dolomite C3: 



12.7 



Percentage of magne- 

 sium in magnesite: 



10 



2 



Percentage of magne- 

 sium in magnesium 

 sulphate: 



o. 1 _. 



o. 01 



o. 001 



Percentage of magne- 

 sium in magnesium 

 chlorid: 



o. 1 



o. 01 



o. 001 



Percentage of magne- 

 sium in magnesium 

 carbonate : 



o. 01 



o. 001 



None 



Wheat 53 days old. 



Calcium. 



173 

 179 



177 

 175 



203 

 205 

 207 



209 

 211 

 213 



2I 5 



217 

 219 



Mag- 

 nesium. 



44 I o. 127 



i 

 54 • 599 



493 1. 002 

 68 .815 



77 

 70 

 40 



5 

 362 



43 



432 



644 



97 



151 



785 

 276 



174 



61.6 

 392 

 123 



Molecular 

 ratio of 

 calcium 

 to mag- 

 nesium. 



2.4 



9.2 



16. 9 

 9.9 



6.9 



II. 5 



3- 1 



4-3 

 6.8 



3-3 



7-5 

 4 



Wheat 65 days old. 



Calcium. 



0-135 



•455 



3°5 

 445 



61 



40 



255 



984 

 3° 



245 



405 

 455 



*5 



Mag- 

 nesium. 



Molecular 

 ratio of 

 calcium 

 to mag- 

 nesium. 



O. 14 



.418 



765 

 783 



54 

 646 



158 



604 



3 1 

 163 



587 

 316 

 16 



5- 7-i 

 5- 7-6 



5:21 

 5:14.6 



5 : 7-3 

 5 : i3-4 

 5: 5-i 



5: 5 

 5: 8.6 



5: 5-5 



12 



5-8 



8.8 



