178 Experiments upon Swedes. 



AVater 24-33 



* Organic matter and ammoniacal salts 5*04 



Bi-phosphate of lime 17'0n 



Equal to bone-earth, rendered soluble by acid .. ( 26-52 ) 



Insoluble phosphates 9*8*.) 



Hydrated sulphate of lime .. .. .. .. 39*25 



Alkaline salts and magnesia 2"81 



Insoluble silicious matter (sand) 1*68 



100-00 



* Containing nitrogen 1*28 



Equal to ammonia 1 • 55 



Plot X. — Manured with 3 cwt. of bone-superphosphate: — 



Produce .. 9 tons 17 cwt. 2 qrs. 2 lbs. 

 Increase .. 3 tons 5 cwt. 3 qrs. 6 lbs. 



The superphosphate used in this experiment was bou2;ht, and 

 had been prepared from coarse bone-dust, and differed materially 

 in composition from the preceding superphosphate, whicli I spe- 

 cially prepared for experimental purposes. 



It will be seen by the subjoined analytical results, that the 

 superphosphate used upon Plot X. contained very little soluble 

 phosphate, but a large proportion of insoluble phosphate and 

 much ammonia. 



Notwithstanding the deficiency of soluble phosphate, it gave 

 quite as good a produce as the preceding superphosphate, which 

 was much richer in soluble phosphate. 



The following are the results obtained on analysing this super- 

 phosphate : — 



Water 13-79 



* Organic matter and ammoniacal salts .. .. 15*00 



Bi-phosphate of lime 2*84 



Equal to bone-earth, rendei-ed soluble .. .. (4-43) 



Insoluble phosphates 25-54 



Hydrated sulphate of lime 21-75 



Anhydrous sulphate of lirnc 4*58 



Alkaline salts and magnesia 4*36 



Insoluble silicious matter (sand) 12-14 



100-00 



* Containing nitrogen 2 45 



Equal to ammonia 2-91 



Plot XT. Nothing Produce, G tons 11 cwt. 2 qrs. 24 lbs, 



„ ^XVI. 4 cwt. of gypsum .. „ 6 „ 13 „ 3 „ 22 „ 



„ XVin. (9 cwt. of red ashes) ,, G ,, IG ,, 3 ,, 1 ,, 



The produce of these three plots is so much alike, that the 

 small differences may be' safely ascribed to natural variations of 

 the soil ; at the same time, the produce of Plots XL, XV I., and 

 X VIIL, shows that the field on which the experiments were tried 



