Field Experiments on Root-Crops. 
377 
into laifje, medium-sized, and small potatoes, which were then 
carefully weighed. 
The following Table embodies the weights of the produce of 
■each plot in large, medium-sized, and small potatoes, the total 
produce calculated per acre, and the increase of each plot over the 
average jield of tlie three unmanured plots Nos. 1, 5, and 10 : — 
PiESULTS of Potato Experiments in 18G0, at Blenneehasset Farm. 
riots. 
Manures Used. 
No Manure 
Mineral Superphosphate 
and 
Muriate of Potash 
and 
Sulphate of Ammonia 
3 I Good Rotten Dung .. 
{Mineral Superphosphate 
and 
Muriate of Potash 
f) ; No Manure 
Mineral Superphosphate 
and 
Muriate of Potash 
and 
Nitrate of Soda . . 
7 Peruvian Guano 
{Mineral Superphosphate 
and 
Common Salt 
9 Good Rotten Dung .. 
10 ' No Manure 
Produce In lbs. per Plot 
of 25 of an Acre. 
Total Produce 
per Acre. 
Increase over 
Average Produce 
of Unmanured 
Plots. 
Large 
Medium 
Small 
tons cwts. 
lbs. 
tons cwts. lbs. 
186 
120 
15 
3 
8 
4 
513 
182 
94 
7 
0 
100 
3 
8 97 
580 
209 
115 
8 
1 
48 
4 
9 45 
498 
155 
107 
6 
15 
80 
3 
3 77 
207 
113 
78 
3 
11 
8 
441 
162 
95 
6 
4 
72 
2 
12 69 
274 
129 
108 
4 
11 
28 
0 
19 25 
326 
116 
103 
4 
17 
36 
1 
5 33 
547 
154 
153 
•7 
12 
56 
4 
0 53 
225 
105 
101 
3 
16 
108 
Average weight of total produce per acre of the three unmanured 
plots, 3 tons 12 cwts. 3 lbs. 
The preceding calculated results exhibit several points of 
interest, on which a few observations may be offered : — 
1. The natural produce of plot No. 1 was somewhat smaller than 
that of plot No. 5, and this was again smaller than the produce 
of the third unmanured plot, No. 10, showing, as already indicated, 
that the field was rather better at one end than at the other. 
The differences in the produce of the three unmanured plots are 
not very great, and it may therefore be assumed that the field, 
was tolerably uniform and well adapted for experimental pur- 
poses. 
2. By far the heaviest crop was obtained by the use of rotten 
dung, which appears to be specially beneficial to potatoes, and 
indeed to all root-crops, in a dry season. 
VOL. VII. — s. s. 2 c 
