20 



Experiments upon Swedes. 



TABLE, showing Produce in Swedes, topped and tailed, and cleaned, per Acre, 

 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. 



tons. cwt. qrs, Ibs. 

 9 6 2 18 



tons. cwt. qrs. Ibs. 

 2 14 3 22 



3 cwt. 



No. 2. 

 No. 1. 

 No. 3. 



No. 4. 



3 cwt. 



3 cwt. 



4 cwt. Binn's patent manure 



3 cwt. of superphosphate of lime 



3 cwt. of fine bone-dust ...... ; . 



(3 cwt. of fine bone-dust, dissolved in) 

 t acid .............. J 



(3 cwt. of bone superphosphate, pur-1 

 \ chased .............. j 



Nothing .............. 



3 cwt. of home-made superphosphate . . 



cwt. of sulphate of ammonia . . 



Jcwt. of sulphate of ammonia, and 

 cwt. of dissolved bone-ash .. 

 cwt. dissolved bone-ash .. 



4 cwt. of gypsum ........ 



4 cwt. of wool-manure ...... 



9 cwt. of red ashes alone 



4 cwt. of Poudrette de Bondy 



3 cwt. of Peruvian guano 



8 9 



8 19 



10 3 



10 5 



8 14 



10 17 



8 11 



9 14 

 9 17 



6 11 2 24 

 10 12 21 



2 2 



5 



5 



2 24 



2 18 

 16 

 26 



3 1 



1 17 



2 7 



3 11 

 3 14 

 2 2 



3 22 



1 20 



2 2 



5 



3 5 



8 18 



6 13 



8 16 



6 16 



8 14 



8 18 



21 



26 



3 22 



3 17 



3 22 



3 1 



1 25 

 1 25 



4 1 25 



Decrease. 

 1523 



Increase. 

 2 11 2 2 



26 

 21 

 26 



All the manures employed in the experiments were carefully 

 analysed. In commenting 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 different ways 

 and of a strength which may make it worth 21. or 10/. a ton ? 

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



