74 T. LytTrLeton Lyon AND JAMEs A. BizzELL 
TABLE 29. PHospHoRus IN Crops 
(In pounds per acre, annual average) 
Phosphorus 
Tank Soil treatment in 
crops 
ASE Pees RR Sree ate Pea SCE Gab tcom eaten ata Not-limed'ss 3. eee eee 9.36 
1 Hea es ee he eas ie a tego Ab Ue ag Timed 232) 0s ae eee 11.12 
There is a larger annual removal of phosphorus in the crops grown on 
the limed soil than in those from the unlimed soil. This was borne out 
by the data for each year, which are given in table 7 of the appendix 
(page 92). The year 1913 was the only one in which more phosphorus 
did not appear in the limed crops. In this respect there was no similar- 
ity between the Volusia and the Dunkirk soil, the latter having shown 
no increase in the quantity of phosphorus in the crops grown on the limed 
soil. 
DIVERGENT EFFECTS OF LIMING THE TWO SOILS 
Comparison of the results of applications of lime to the Dunkirk soil 
with those obtained from the Volusia soil shows some striking differences. 
It will be remembered that the Dunkirk soil contained about 50 per cent 
more calcium in the surface foot than does the Volusia soil, and that this 
ratio gradually increased with the depth, the fourth foot of the Dunkirk 
soil containing 319 per cent more than the corresponding layer of the 
Volusia. The lime requirement of the two soils by the Veitch method 
was about the same when averaged for the four feet, altho it was slightly 
greater in the surface foot of the Volusia. It is evident that the lime 
requirement as determined is not a measure of the calcium content of these 
soils. 
In the light of this information it is interesting to observe the effect of 
liming in order to ascertain whether the calcium content or the lime require- 
ment is the better guide to the need of the soils for lime as expressed by 
their response in crop yield. The records for the Dunkirk soil show that 
there was no larger yield on the limed tanks than on the unlimed. On the 
Volusia soil there was a consistently larger yield on the limed soil each 
