é 
LysIMETER EXPERIMENTS — II 77 
in the case of oats the amount of nitrogen in the crop and in the drainage 
water was less than in the drainage water from bare soil. The same 
relation held with the Dunkirk soil. 
The quantity of calcium in the drainage water of the unplanted soil 
was greater than that in the crops and the drainage water combined from 
the cropped soil. Therefore the process of cropping conserves the calcium 
in the soil even when the cropsare removed. This may be accounted for, in 
part at least, by the large formation and leaching of nitrates from bare soil. 
Apparently the application of burnt lime to the Volusia soil increased 
the amount of soluble calcium in that soil, but this was not the case with 
the Dunkirk soil. The Volusia soil has a greater lime requirement and a 
lower calcium content than has the Dunkirk soil. 
To keep the soil supply of calcium up to its present amount would re- 
quire an annual application of 536 pounds of pure burnt lime, or 957 
pounds of pure limestone, to supply the bare soil, and 371 pounds of burnt 
lime, or 662 pounds of limestone, to supply the planted soil. 
Magnesium was present in the drainage water in much smaller quantity 
than was calcium. Application of lime to the soil increased the quantity 
of magnesium in the drainage water. Cropping decreased the removal 
of magnesium from the soil. These relations were the same as for the 
Dunkirk soil. 
Potassium was removed in larger quantity in the drainage water than 
in the crops, in which respect the Volusia soil differed from the Dunkirk 
soil. It agreed with the latter, however, in that the application of lime 
did not increase the quantity cf potassium in the drainage water nor in 
the crops. 
Cropping did not materially affect the total removal of sulfur from the 
soil. Applications of lime resulted in a slight decrease in the sulfur re- 
moved in the drainage water. With the Dunkirk soil, applications of 
lime increased the amount of sulfur removed in the drainage water. 
Phosphorus was present in the drainage water only in amounts too small 
to be determined. Applications of lime increased the removal of phos- 
phorus in the crops. With the Dunkirk soil, applications of lime did 
not increase the removal of phosphorus in the crops. 
Memoir 38, The Crane-Flies of New York. Part II. Biology and’ Phylogeny, the third preceding number 
in this series of publications, was mailed on July 18, 1921. j ‘ ieee: 
Memoir 39, The Genetic Relations of Plant Colors in Maize, the second preceding number in this serie: of 
publications, was mailed on July 19, 1921. 
