18 



soft phosphate was prepared as follows : Equal quantities of 

 the two phosphates were thoroughly mixed and moistened 

 about one month before being applied to the soil. The mix- 

 ture was then allowed to dry thoroughly, after which it was 

 pulverized as thoroughly as practicable. This was done in 

 order that reverted phosphate might be formed from some of 

 the phosphoric acid previously existing in an insoluble form 

 in the Florida soft phosphate. 



Florida soft phosphate was compared with an equal weight 

 of acid phosphate in a fertilizer mixture containing no vege- 

 table matter and also in combination with cottonseed meal> 

 the decomposition of which, if enough meal is used, is probably 

 favorable to the effective action of the crude phosphate. 



The following table presents the data of these experi- 

 ments : 



Mesidts of comparisons of different phosphates. 



o 



o 



•! 



10 I 



r 

 I 



r 



15 



"I 



Fertilizers. 



Amount 

 per acre. 



KIND. 



Lbs. 

 240 



70i 



30' 

 240 



70i 



30 

 240 

 150 



30 

 120 

 120 

 150 



30 

 240 

 150 



30 

 120 

 120 

 1.50 



30 

 240 

 1.50 



30 

 240 

 150 



30 



Acid phosphate ^ 



Nitrate of soda I 



Muriate of potash j 



Florida soft phosphate \ 



Nitrate of soda I 



Muriate of potash J 



Florida soft phosphate i 



Cottonseed meal > 



Muriate of potash ) 



Acid phosphate "] 



Florida soft phosphate , ! 



Cottonseed meal \ 



Muriate of potash J 



Acid phosphate 



Cottonseed meal 



Muriate of potash 



Acid phosphate "] 



Florida soft phosphate I 



Cottonseed meal \ 



Muriate of potash J 



Acid phosphate ^ 



Cottonseed meal >■ 



Muriate of potash J 



Tennessee phosphate 



Cottonseed meal 



Muriate of potash 



hi 



o 

 o 



>^ 



Lbs. 

 1,035 



967 



792 



892 



972 



946 



1,132 

 1,116 



