LYSIMETER EXPERIMENTS — II 53 
This soil has always permitted the rainfall to percolate readily since 
t has been in the tanks. At no time has there been any stoppage and there 
qas never been any water standing on the surface. The soil has, on the 
vhole, drained more quickly and given a clearer percolate than did the 
Junkirk clay loam in tanks 1 to 12. 
Chemical composition 
_ The samples used for the mechanical analysis of the soil in these tanks 
vere taken from each foot layer and represent the average composition 
ff the four tanks. The samples for the chemical analysis were obtained in 
he same manner. Bulk analyses were made. The methods used are 
tated in the appendix to Memoir 12 (pages 85 to 87) and the results are 
riven in table 3: 
TABLE 3. Cuemicat ANALYSIS oF Soin Puacep IN Tanks 13 To 16 
Constituents determined ee Berens Foe youn 
itrocenk (MerMICeENG) iq c decroe ccc ees 6s 0.145 0.052 0.059 0.050 
rganic carbon (per cent)................. 1.560 0.270 0.115 0.080 
Jalcium oxide (per cent)...............4.- 0.230 0.165 0.260 0.365 
Tagnesium oxide (per cent)............... 0.560 0.390 0.290 0.460 
’otassium oxide (per cent)................ 1.690 1.810 1.710 2.170 
odium oxide (per cent)...............0.. 1.120 0.940 0.810 1.070 
*hosphoric anhydride (per cent)........... 0.071 0.039 0.018 0.071 
manur trioxide (per cent).........4....-.. 0.042 0.03 0.041 0.031 
Jvarbon dioxide as carbonate (per cent)..... 0.030 0.030 0.020 Trace 
ime requirement (CaO in parts per million)|1,350 800 650. 400 
_ The chemical analysis shows a relatively good supply of plant nutrients 
Ss compared with the average soil or with the Dunkirk soil in tanks 1 
0 12, but the Dunkirk is a much more productive soil, as is evident on 
omparison of the yields of crops from both sets of tanks. The only 
‘lements in which the surface foot of the Volusia soil is materially below 
hat of the Dunkirk are calcium and sulfur. Nitrogen, phosphorus, 
nd potassium are about equal in amount in the two surface soils. The 
!me requirement according to the Veitch method is somewhat greater 
)1 the Volusia soil. In the second, third, and fourth feet the calcium is 
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