180 Experiments upon Swedes. 



Under the circumstances in which the sulphate of ammonia 

 was tried in 1857, it had a decidedly injurious effect u])on 

 the yield of the turnip crop, although only 1^ cwt. of sulphate 

 of ammonia had been employed per acre. 



Plot XIV. — Manured with 1^ cwt. of sulphate of ammonia^ 

 and 1^ cwt. of dissolved bone-ash : — 



Produce .. 9 tons P> cwt. 26 lbs. 

 Increase .. 2 tons 11 cwt. 2 qrs. 2 lbs. 



Plot XV. — Manured with H cwt. of dissolved bone-ash : — 



Produce .. 8 tons 18 cwt. 3 qrs. 22 lbs. 

 Increase .. 2 tons 7 cwt. 26 lbs. 



The dissolved bone-ash used in these experiments was found 

 to contain in 100 parts : — 



Water 32-80 



Organic matter '13 



Bi-pliosphate of lime IS'49 



Equal to bone-earth, rendered soluble by acid .. ( 28'80) 



Insoluble phosphates 6'43 



Hydrated sulpiiate of lime 38'39 



Alkaline salts 1-94: 



Sand 1-82 



100-00 



The produce of these two plots may be considered as identical, 

 nnd, as tlie superphosphate made from bone-ash contained no 

 nitrogen or ammonia at all, we have here a positive proof of the 

 inefficacy of ammonia on the soil of the experimental field in 

 1857. 



Plot XVII. — Manured with 4 cwt. of wool manure for 

 turnips : — 



Produce .. 8 tons 16 cwt. 3 qrs. 22 lbs. 

 Increase .. 2 tons 5 cwt. 26 lbs. 



The composition of this manure was found to be as follows : — 



Moisture 21-26 



(Ammoniacal salts and soluble organic matter .. 10-52 



* I Insoluble organic matter 5-28 



P.i-pliosphate of lime 1-41 



Equal to bone-earth, rendered soluble by acid .. ( 2-21 ) 



Insoluble phosphates 12-63 



Hydrated sulphate of lime 23-41 



Alkaline salts (chiefly common salt 15-26 



Insoluble silicious matter (sand) 10*23 



100-00 



* Containing nitrogen 2*96 



Equal to ammonia ^'^JS 



