LYSIMETER EXPERIMENTS — II 69 
TABLE 21. Average Macnestum ConteNT oF DRAINAGE WATER FROM PLANTED AND 
FROM UNPLANTED TANKS 
Soil treatment Magnesium 
(parts per million) 
Tank | 
For Average 
Crop Lime each for crop 
tank treatment 
1D. oo coe Cone Re ORG ee Sea Planted...... Not limed.... 6.1 6.3 
Bo 9 066 660 nde Ue ens BEa eae Planted...... himed eee 6.6 : 
Id, 5 ooo pee eR Re Oe oe eee Bare. hear Not limed.... 7.3 82 
GMP aa eeu Abie ee eee es Bare. wise: Limed....... Om : 
Effect of liming on removal of magnesium 
The effect of liming the soil was to increase the removal of magnesium 
both in the leachings and in the crops, as may be seen in table 22. There 
TABLE 22. Average ANNUAL REMOVAL OF MAGNESIUM FROM LIMED AND FROM UNLIMED 
TANKS 
(In pounds per acre) 
Magnesium removed from Magnesium 
planted tanks leached 
Soil treatment Tank Tank from cor- 
In re responding 
drainage unplanted 
water crops Hoes tanks 
INotilimed........ Be Yee 13 29.6 3.06 | 32.66 14 39.30 
imed ee mateete a fs ass 15 31.7 3.93 | 35.63 16 51.60 
appears to be a basic exchange, similar to that which occurred in the 
Dunkirk soil, by which magnesium was liberated and dissolved by the 
soil water. The concentration of magnesium also was greater in the drain- 
age water from the limed soil than in that from the unlimed, as may be 
seen in table 21. 
REMOVAL OF POTASSIUM 
Potassium differs from the other bases that were determined in the 
Dunkirk soil in that it was removed in greater quantities by the crops 
than by the drainage water. This was not true of the removal of potas- 
sium from the Volusia soil, 
