54 T. Lyrrueton Lyon AaNnpD JAMES A. BIzzELL 
much higher in the Dunkirk soil. If the difference in productiveness and 
other properties is to be traced to any difference in chemical composition, 
it would appear that calcium and possibly sulfur are the only constit- 
uents that would call for inspection. It is true, however, that magnesium 
is higher in the surface foot of the Volusia soil. 
MANURE AND FERTILIZERS USED 
Farm manure was applied once to the soil in each of the four tanks. 
This application was made in the spring of 1914. The analysis of the 
manure is given in table 4. The method of analysis is described in the 
appendix to Memoir 12, pages 90 and 91. 
TABLE 4. Composition oF Farm Manure APPLIED TO THE Sort IN TanxKs 13 To 16 
Percentage Pounds 
Constituents com- per 
position acre 
DY TyTN GEOR cal cae sus ees fed eaaeae te aes ne me eee oe ea ee 21.26 4,252 
INDERO GET ccs apie oe eb so ste sala Nance o> Vataes See aT Re ema age 0.50 100 
Phosphoricianhydrideyy.j acne see ee i eee 0.37 74 
Potassium’ Oxd d erse sey ery ops e tae ecar neh eee ane aay Suen) eR 0.36 72 
Galeiummo xd Oh earn rakes eh cose eae a eon eae cee Oe aerate 0.63 126 | 
Macon esium oxide ttiane Slik o monnak esti netennn un Ney anraaleen, 0.27 54 
The burnt lime, of which one application was made, contained 91.95 
per cent of CaO and a trace only of MgO. 
METHODS FOR CHEMICAL AND MECHANICAL ANALYSES 
The methods used for the chemical analyses of the soil, crops, drainage 
water, rain water, manure, lime, and potassium sulfate, and for the 
mechanical analysis of the soil, are described in the appendix to Memoir 
12, pages 85 to 91, inclusive. 
SOIL TREATMENT AND CROPPING SYSTEM 5 
The four tanks used in this experiment were all filled in the late summer 
of 1910. From that time until the spring of 1913 they were not treated 
in any way, but the drainage was collected, measured, and analyzed in 
