July 17, 1916 Influence of Calcium and Magnesium on Plant Growth 609 



In Table XIV pots 205, 208, 210, 212, 213, 216, 218, and 220 were har- 

 vested 53 days after planting. Their duplicates were permitted to grow 

 12 days longer. Pots 221, 223, 226, 227, 229, 232, 235, and 237 were 

 harvested at maturity, 80 days from the time of planting. Duplicates 

 were grown only 53 days. The analyses are given in Tables XV and XVI . 



Table XV. — Analysis of straw of wheat grown with sulphates, chlorids, and carbonates 

 of calcium and magnesium — series L 



SULPHATES 



203. 

 205. 

 208. 



Pot No. 



Substance added. 



Composition of plants. 



Calcium. 



O. 222 

 . 022 

 . 002 



Magne- 

 sium. 



O. I 



. OI 

 . OOI 



Calcium. 



Mgm. 

 18.48 

 26.6 

 15.2 



Per cent. 



O.77 



.70 



.40 



Magnesium. 



Mgm. 



15-45 

 38.86 



5-73 



Per cent. 

 O. 644 



•97 

 •I5 1 



Molecular 

 ratio of] 

 calcium 



to magne- 

 sium. 



5: 6.9 

 5:"-5 

 5: 3-i 



210. 

 212. 

 213. 



4-3 

 6.8 



3-3 



CARBONATES 



2l6. 

 2l8. 

 220. 



022 

 002 



OI 

 OOI 



9- 24 

 17.28 



28 

 432 

 2 53 



2 °-33 



15.68 



2.58 



616 

 392 

 123 



5:i8-3 



5: 7-5 

 5: 4 



The plants used in the experiments in Table XV were harvested when 

 53 days old. 



Table XVI. — Analysis of soybean hay grown with sulphates, chlorids, and carbonates of 

 calcium and magnesium — series M 



SULPHATES 



222. 



224. 



225. 



Pot No. 



Substance added. 



Composition of plants. 



Calcium. 



222 

 022 

 002 



Magne- 

 sium. 



Calcium. 



Mgm. 

 3°-94 

 41.89 

 21. 24 



Per cent. 

 I. 19 

 .885 



•59 



Magnesium. 



Mgm. 

 31.46 

 31.45 

 12. 24 



Per cent. 

 I. 21 

 . 642 



•34 



Molecular 

 ratio of 

 calcium 

 to mag- 

 nesium. 



5:8.4 

 5 -6- 2 

 5:4.8 



CHLORIDS 



228. 

 230. 

 231. 



5 7-5 

 5:6- 4 

 5:6.1 



233- 

 235- 

 237- 



022 

 002 



CARBONATES 



OI 



OOI 



17. 26 



'2. 13 



7- 15 



94 



145 



55 



23.92 



38.36 

 4.04 



825 

 609 

 3" 



57-3 

 5:4-4 

 5:4-7 



42719°— 1G- 



