FLORIDA ,STATE HORTICULTURAL SOCIETY. 
107 
1. Physiologically Neutral. 
Calcium sulphate (gypsum). 
Magnesium sulphate. 
Sodium chloride (common salt.) 
Superphosphate, (acid phosphate) 
Potassium nitrate. (This ap¬ 
proaches closely group 3). 
2. Physiologically Sour. 
Potassium chloride (muriate of 
potash). 
Ammonium sulphate. 
Potassium sulphate. 
German potash salts in general. 
3. Physiologically Basic. 
Calcium carbonate. 
Wood ashes. 
Caustic lime. 
Potassium carbonate. 
Undissolved calcium phosphate. 
Sodium nitrate (nitrate of soda.) 
Bone meal. 
(Loew would probably place super¬ 
phosphates with the physiologically sour 
materials.) Such a classification will be 
helpful in determining whether certain 
systems of fertilizing are tending to in¬ 
crease or decrease the natural acidity of 
the soil. (Shell hammocks, and places 
where limestone and marl come near the 
surface are not likely to be acid.) 
LIME NOT INCOMPATIBLE WITH SUPER¬ 
PHOSPHATES. 
There has been a wide-spread belief 
that liming decreases the efficiency of su¬ 
perphosphates, the theory being that the 
soluble phosphoric acid unites with the 
lime to form insoluble phosphate of lime. 
However, Wheeler at Rhode Island has 
shown with different crops and with ten 
different phosphates (including four su¬ 
perphosphates), on land deficient in car¬ 
bonate of lime, that liming greatly in¬ 
creases the yield in almost every case. I 
give herewith his results with Mangel 
Wurzels. 
Mangel Wurzel (Norbiton Giant) 
Limed Unlimed 
Dissolved bone-black. 328 3 
Dissolved bone . 380 101 
Acid phosphate . 340 8 
Fine ground steamed bone . 447 16 
Basic slag meal (“Thomas” phosphate) 362 73 
Floats . 223 0 
Raw iron and aluminum phosphate 36 0 
Roasted iron and aluminum phosphate 153 0 
No phosphate . 40 0 
Double superphosphate . 145 1 
Very similar results, though not quite 
so striking, were obtainea with Swedish 
turnips and German golden millet. From 
these it will be seen that with the four 
superphosphates (acid phosphate, dissolv¬ 
ed bone, dissolved bone black, and double 
superphosphate), the yield was invaria¬ 
bly greater where lime was used than 
where it was omitted. From this it would 
appear that the efficiency of superphos¬ 
phates is not lessened by the use of lime. 
LIME NEEDED WHERE IRON HARDPAN OC¬ 
CURS. 
Several writers have called attention to 
the fact that the efficiency of phosphates 
is increased by the use of lime, where iron 
and alumina occur in considerable quan¬ 
tities. If there is a deficiency of lime 
there is a tendency for the soluble phos¬ 
phoric acid to unite with the iron and 
alumina, forming insoluble phosphates of 
these metals. If, however, the soil is well 
supplied with lime the phosphoric acid 
would unite with this to form phosphate 
of lime. In this connection Hilgard 
