28 Experiments upon Swedes. 



Water 24-33 



* Organic matter and ammoniacal salts 5*04 



Bi-phosphate of lime 17'00 



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



Insoluble phosphates 9*89 



Hydrated sulphate of lime .. .. .. .. 39'25 



Alkaline salts and magnesia 2*81 



Insoluble silicious matter (sand) T68 



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 Ibs. 

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



The superphosphate used in this experiment was bought, and 

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

 in composition from the preceding superphosphate, which 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, rendered soluble . . . . ( 4*43 } 



Insoluble phosphates 25*54 



Hydrated sulphate of lime . . 21*75 



Anhydrous sulphate of lime 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 XI. Nothing Produce, 6 tons 11 cwt. 2 qrs. 24 Ibs. 



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



XVIII. (9 cwt. of red ashes) 6 16 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, XVI., and 

 XVIII., shows that the field on which the experiments were tried 



