30 Experiments upon Swedes. 



Under the circumstances in which the sulphate of ammonia 

 was tried in 1857, it had a decidedly injurious effect upon 

 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 l cwt. of dissolved bone-ash : 



Produce . . 9 tons 3 cwt. 26 Ibs. 

 Increase .. 2 tons 11 cwt. 2 qrs. 2 Ibs. 



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



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

 Increase . . 2 tons 7 cwt. 26 Ibs. 



The dissolved bone-ash used in these experiments was found 

 to contain in 100 parts : 



Water 32-80 



Organic matter '13 



Bi-phosphate of lime 18*49 



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



Insoluble phosphates 6*43 



Hydrated sulphate of lime 38'39 



Alkaline salts 1-94 



Sand 1-82 



100-00 



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

 and, as the 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 Ibs. 

 Increase . . 2 tons 5 cwt. 26 Ibs. 



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



Moisture 21'26 



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



* (Insoluble organic matter 5 -28 



Bi-phosphate 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 3-63 



