24 Experiments upon Swedes. 



Composition : 



Moisture 13'06 



* Organic matter and amrnoniacal salts 3' 65 



Bi-phosphate of lime 11*75 



Equal to bone-earth, rendered soluble by acid .. .. ( 18'33) 



Insoluble phosphates j Phosphoric acid .. 21'61\ O Q oq 



consisting of : ..\Lime 17 '72) 



Hydrated sulphate of lime 23*17 



Alkaline salts 1'76 



Insoluble silicious matter 7*28 



100-00 



* Containing nitrogen 32 



Equal to ammonia 38 



Percentage of phosphates, rendered soluble 18*33 



of insoluble phosphates, calculated as tribasic I .- Q0 



phosphate of lime / 



Total percentage of phosphates .. 65-15 



The total percentage of phosphates in this guano is very large 

 indeed ; the amount of ammonia, on the other hand, is inconsider- 

 able. Notwithstanding the small amount of ammonia, the sample 

 marked No. 4 has given the best result of the four manures 

 that bear the name of phospho-Peruvian guano. 



All four are very concentrated manures, which, as mentioned 

 already, in more favourable seasons would have given, I do not 

 doubt, a much larger increase. 



From the following experiments it will appear distinctly that 

 the produce on the experimental field could not be raised by 

 any description of manure much above ten tons per acre, nor 

 can there be any doubt that a large proportion of the phosphates 

 in these guanos, on account of the long-continued dry weather, 

 remained in the soil inactive. 



Plot VI. Manured with Binn's patent manure at the rate of 

 4 cwt. per acre. 



Produce . . 8 tons 1 4 cwt. 2 qrs. 18 Ibs. 

 Increase . . 2 tons 2 cwt. 3 qrs. 22 Ibs. 



The turnips on this plot did not look quite so well as the five pre- 

 ceding lots, especially in the leaf and during the first three months. 

 On analysis Binn's patent manure gave the following results : 

 Moisture 25'61 



* Organic matter 20"! 5 



Phosphates and oxides of iron and alumina .. 3'74 



Sulphate of lime 1*67 



Carbonate of lime .. ..: 15'47 



Chloride of sodium (common salt) 9*35 



Insoluble silicious matter 23'61 



Magnesia and loss '40 



100-00 



* Containing nitrogen '845 



Equal to ammonia ... .. 1-029 



