ISO 



ON MANURES WHOSE CHIEF FERTILIZINO 



Art. XXXIX.— on MANURES WHOSE CHIEF FERTILIZING 

 SUBSTANCE IS PHOSPHATE OF LIME. 



By the Editor of the " Farmer's Almanac." 



Some years liave now elapsed since the writer of this, in an 

 essay on the use of crushed bones, ventured to refer to the 

 proba]jle value as a fertilizer of the native phosphorite of 

 lime. In 18i4, Dr. Daubeny made some experiments with 

 reg'ard to its power as a manure for turnips, and obtained the 

 following" weights of turnip roots per acre : — ^ 



From the soil, simple, ia lb 14*298 



Bone shavings, 10 cwt 19-239 



Chemical Manure Co.'s guano, 260 lb 26-058 



Spanish phosphorite, 12 cwt 28-639 



Sulphuric acid with ditto, 12 cwt 30-869 



S. American guano, 260 lb 31"114 



Bones with sulphuric acid, 11 cwt 31-898 



Graham's Animal Comp., 260 lb 32-109 



Sulph. of ammonia, 1 cwt 32-670 



Bones, finely powdered, 12 cwt 36-185 



Potter's guano, 260 lb 37-201 



Stable dung, 22 tons 39'476 



In some experiments of Sir II. Verney's," the fertilizers 

 were apj)lied in 1844 to a turnip crop. The experiment, 

 however, failed, from the seeds not g-erminating-. On the 

 succeeding- crop of Chevalier barley (sown at the rate of 1|- 

 bushel), the following- were the manures applied, and the 

 results produced per acre : — 



Weight. 



Soil simple 



Unburnt bones 



Burnt bones 



Pigeon's dung 



Spanish phosphorite and sulphuric acid 



Superphosphate of lime 



Stable dung 



1 7 



18 



18 



18 



1 



20 



5f 

 



» Jour. R. A. S., vol. vi. p. 330. 

 9 Ibid. p. 331. 



