Experiments upon Swedes. 



large-sized roots planted far apart. Some time ago I had a cal- 

 culation made of the number of roots which can be grown per 

 acre when drilled at different distances and singled at different 

 breadths, and as these calculations may be useful to others, and 

 convince them, as they have^done myself, that we should manure 

 the root-crop well in the first instance, and then plant tolerably 

 closely, I have incorporated them in the following table : 



TABLE, showing the Number of Roots per A ere, drilled at different internals 

 and singled at different distances, also the Area occupied ly each Plant, in 

 square inches. 



But to return to the plots. I have reason for believing that 

 there must have been more roots on Plot No. 1 than on Plot 

 No. 2 ; for I find the land on one side of the experimental plots 

 yielded 17 tons 6 cwts. 1 qr. 20 Ibs. per acre, and on the other 

 side it gave 17 tons 18 cwts. 24 Ibs. per acre. The whole field, 

 as mentioned already, was manured with about 15 tons of yard- 

 manure and 3 cwts. of superphosphate. This produce agrees 

 well with the weight of the roots on the second plot, manured 

 with dung and superphosphate. Still we have a difference of 

 nearly 12 cwts. of roots in the two plots adjoining the experi- 

 mental lots, and ought, therefore, to remember that the natural 

 variations of the land and other purely accidental circumstances 

 may readily give a difference in the produce of different portions 

 of land which have been treated in every respect alike. Indeed, 

 if the difference in the produce does not amount to more than 

 1 ton, or even 1J ton, I fear we cannot do much with the results. 

 It certainly would be rash to lay stress on such differences, and 

 to use them as arguments in proving or denying the efficacy of 

 certain manuring matters : 



Plot 3. Manured with 3 cwts. of Superphosphate. 



tons. cwts. qrs. Ibs. 



Produce 17 11 2 10 



Increase 2 17 1 <> 



Plot 4. Manured with 1 cwt. of Superphosphate. 



tons. cwts. qrs. Ibs. 



Product- 17 6 3 4 



Increase .. 2 12 2 



