380 Field Experiments on Root-Crops. 
Eesults of Potato Experiments at Esceick Home Farm in 1870. 
Manures used per Acre. 
Produce of 
each Plot of 
No Manure 
Mineral Superphosphate 
and 
Potash-salts 
and 
Sulphate of Ammonia 
Good Rotten Dung 
Mineral Superphosphate 
and 
Potash-salts 
No Manure 
Mineral Superphosphate 
and 
Potash-salts 
and 
Nitrate of Soda .. .. 
Peruvian Guano .. 
Mineral Superphosphate 
aud 
Common Salts 
Good Rotten Dung 
No Manure 
cwts. 
4 
2 
2 
tons 
20 
cwts. 
4 
4 
4 
2 
2 
4 
4 
4 
tons 
20 
stones lbs. 
30 13 
71 13 
73 0 
68 3 
35 10 
70 2 
41 0 
35 4 
90 
41 
Again, of the two plots which were dunged, the produce of 
plot No. 9 was larger than on the second dunged plot, placed 
nearer to plot No, 1. 
At the end near plot No. 10 the field evidently was naturally 
more productive than near Plot 1. 
In calculating the increase per acre due to the application of 
the various fertilizing agents employed, I have taken the mean 
produce of the two unmanured plots, No. 1 and No. 5. The 
average weight of potatoes on these two plots amounts to 4 tons 
3 cwts. 34 lbs. per acre, and the increase on each manured plot 
over the average produce of clean potatoes from plots Nos. 1 and 
5 is shown in the Table on the following page. 
These results confirm in a striking manner Messrs. Coleman 
and Hull's experience with the same manures in 1868, and they 
agree likewise with Mr. Charles Hunter's experiments at Blcn- 
nerhasset Farm made in 1869. 
The tabulated statements of results lead me to make the 
following remarks : — 
1. In a dry season rotten dung produced the most luxuriant 
crop. In such a season, however, very nearly the same increase 
