78 
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 ])lant tolerably 
closely, I have incorporated them in the following table : — 
Tarlk, shoidng the Number of Roots per Acre, drilkd at different intervals 
and singled at different distances, also the Area occupied ly each Plant, in 
square inches. 
Siiieleil opiivt, 
Width of 
Numhpr of Plants 
Area occupied 
ill Inches. 
JJriUs. 
per Acre. 
l)y each Plant. 
Sq. inches. Sq. feet. 
9 
)i 
26 
26,806 
234 = 1| 
9 
22 
31,680 
198 = li 
12 
55 
26 
20,10i 
312 = 2^ 
12 
55 
22 
23,760 
264 = li 
15 
55 
26 
16,083 
390 = 2f 
15 
55 
22 
19,008 
330 = 2rjj 
18 
26 
13,403 
468 = 31 
18 
55 
22 
15,840 
396 = 2^ 
But to i-eturn 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 G cwts. 1 qr. 20 lbs. per acre, and on the other 
side it gave 17 tons 18 cwts. 24 lbs. 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 Ijeen treated in every respect alike. Indeed, 
if the difference in the produce does not amount to more than 
1 ton, or even IJ 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. Ilanured with 3 cwts. of Superphosphate. 
tons. cwts. qrs. lbs. 
rrodncc 17 11 2 10 
Increase 2 17 1 6 
Plot i. ifanurcd with 1 net. of Superphosphate. 
tons. cwts. qrs. lbs. 
Produce ' .. 17 6 3 4 
Increase 2 12 2 0 
