155 
ures, which might indicate the relative agricultural value of 
each fertilizing ingredient, as follows: 
Average of 
all plats containing 
Superphosphate 4.88 
Steamed bonemeal 4.88 
Eeverted superphosphate 4.81 
Nitrate of soda 4.60 
Sulphate of ammonia 4.75 
Organic 4.92 
Chloride of potash 4.94 
Sulphate of potash 5.10 
Sulphate of potash magnesia 5.27 
Check plats 4.19 
It would seem from this that the phosphoric acid had about 
the same effect in all three forms ; that organic matter gave 
the best and nitrate of soda the poorest results of the nitrogen 
carriers ; and that the sulphate of potash was a better form 
to apply than the chloride. 
SUMMARY AND CONCLUSIONS. 
Superphosphate, reverted phosphate and steamed bonemeal 
showed good results when applied to pineapple plants. Super- 
phosphate gave better results when applied together with lime. 
Nitrogen is not the dominant element in pineapple fertiliz- 
ing. Of the three forms studied, nitrate of soda was the least 
productive of good results. There was not much choice be- 
tween sulphate of ammonia and steamed hoofmeal as nitrogen 
carriers. 
Of the potash salts, the sulphates of potash magnesia gave 
the best results, followed by sulphate of potash and chloride 
of potash, respectively. 
Fertilized soil tends to bring the fruit to maturity from two 
to four weeks earlier than the unfertilized. 
In interpreting the results, too much confidence should not 
be placed in the field notes alone. 
The results corroborate those obtained by the Florida Ex- 
periment Station in practically every instance. 
In conclusion, the writer wishes to give Messrs. Ginaca 
Bros, proper credit for their faithful and enthusiastic cooper- 
ation in this work. Acknowledgment is also due Mr. F. G. 
Krauss and Mr. S. S. Peck for helpful suggestions and advice. 
CARLTON C. JAMES. 
Chemical Laboratory, 
The Pacific Guano & Fertilizer Co., 
Honolulu, Hawaii. 
