170 



Experiments upon Sivedes. 



Table, showing Produce in Swedes, topped and tailed, and cleaned, per Aare, 

 and Increase per Acre, on Field No. 19, College Farm. 



Produce per Acre. 



Increase per Acre. 



Plot 



I. 



II. 



III. 



IV. 



V. 



VI. 



VII. 



VIII. 



IX. 



X. 



XI. 

 XII. 



XIII. 



XIV. 



XV. 



XVI. 



XVII. 



XVIII. 



XIX. 



XX. 



3 cwt. phospho-Peruvian guano, No. 1. 

 3 cwt. . „ ., „ No. 2. 



li cwt. „ „ „ No. 1. 



3 cwt. „ ,, „ No. 3. 



3 cwt. „ „ „ No. 4. 



4 cn't. Binn's patent manure 



3 cwt. of superphosphate of lime .. 



3 cwt. of fine bone-dust 



1 3 cwt. of fine bone-dust, dissolved inl 



\ acid I 



1 3 cwt. of bone superphosphate, pur-) 

 \ chased J 



Nothing 



3 cwt. of home-made superphosphate . . 



1^ cwt. of sulphate of ammonia . . 



nj cwt. of sulphate of ammonia, and'l 



\1 J cwt. of dissolved bone-ash ., ../ 



I5 cwt. dissolved bone-ash 



4 cwt. of gypsum 



4 cwt. of wool-manure 



9 cwt. of red ashes alone 



4 cwt of Poudrette de I5ondy 



3 cwt. of Peruvian gxiano 



tons. cwt. qrs, lbs. 

 9 6 2 18 



tons. cwt. qrs. lbs. 

 14 3 22 



9 



19 



3 



5 



14 

 17 

 11 



9 14 



9 17 



5 



5 



2 24 



2 18 

 16 

 26 



3 1 



17 

 7 



11 



14 

 2 

 5 



19 



6 

 9 

 9 

 

 22 

 20 



All the manures employed in the experiments were carefully 

 analysed. In commentinj^ upon the results obtained in the field, 

 I shall give the analysis of the artificial manures, and accompany 

 them with some general remarks, which I trust will be found 

 useful to those readers who are in the habit of buying artificials 

 for their root crops. I would also make the remark that in all 

 accounts of manuring experiments it is absolutely necessary to 

 convey to the reader some idea of the character of the manures 

 employed in the experiments ; and this can only be done by 

 giving an analysis of the different fertilizers. I have no hesita- 

 tion in saying that accounts of experiments, in which analyses 

 of the manures experimented with are omitted, are much better 

 suppressed than published, for such experiments are more 

 calculated to do harm than good. This remark of course does 

 not apply to fertilizers of a definite chemical composition, or to 

 fertilizers like Peruvian guano, the average composition of which 

 is well known. What is the use, I would ask, of recording 

 experiments with superphosphate, when it is well understood 

 that superphosphate can be prepared in twenty difterent ways 

 and of a strength which may make it worth 2/. or 10/. a ton? 

 Again, I would ask, Avhat is the use of comparing the effects 



