17 



While the content of ash, lime, phosphoric acid, potash, silica, and 

 nitrogen was practically the same for the two sets of samples analyzed, 

 the magnesia and iron content was liigher in crop B than in crops D 

 and F, and it will be noticed that this difference holds for the plants 

 gro\\ii on all four soils. These results are rather striking when it is 

 considered that crop B and crops D and F were grown in different 

 years and that no magnesium M^as added in any fertUizer. 



The extent to which the carbonate of hme in the soil influenced tlio 

 ash composition and amount of inorganic substances in the dry matter 

 of the plants is better shown in Table VII. Here the percentages of 

 the different elements present in the plants grown in Plat I are ex- 

 pressed as 100, <ind the percentages present in the plants grown in 

 Plats II, III, and IV are expressed relative to 100. Table VII gives 

 only the average result of the three crops analyzed. In calculating 

 the average, twice the value was given to the analysis of the com- 

 posite sample of crops D and F that was given to the analysis of crop 

 B, so the average result gives an equal value to aU three crops, B, D, 

 and F. 



Table VII. — Rclaliic nsh composition of bush bcans/rom different plats. 



From Table VII it is apparent that tlic chief effect of the carbonate 

 of lime in the soil upon the ash constituents m the dry substance of 

 the bush beans or upon the composition of their ash lay m dimm- 

 Lshmg the content of iron. The silica content is also considerably 

 dimmished m the plants grown on the fourth plat. The content of 

 lime, phosphoric acid, and nitrogen m the dry substance and in the 

 ash is remarkably constant for the plants growii on all four plats. 

 48882°^14 3 



