Field Experiments on Potatoes. 413 
■which my friends Messrs. Coleman and Hull undertook for me 
in 1869. 
Tliey were tried on light land, which, however, was in a good 
agricultural condition. 
Each plot, measuring of an acre, was planted with Victoria 
potatoes on the 19th of April, 1869, and the crop harvested on 
the 15th of October and weighed on the same day, when the 
following results were obtained : — 
Table XIII. — Showinfi; the kind and quantity of Manure used in Potato Expe- 
riments, made in 18G9, at Escriciv Park Home-farru, near York, by Messrs. 
Coleman and Hull, and Produce of each Experimental Plot, and Produce 
calculated to the Acre. 
Plot*. 
Description of Manure. 
{Mineral Superphosphate 
Crude Potash-salts 
Sulphate of Ammonia .. 
Rotten Dung .. 
J Mineral Superphosphate 
" |\ Potash Salts 
4 I No Manure 
f Mineral Superphosphate 
Potash-salts 
Nitrate of Soda 
6 Peruvian Guano .. 
JMineral Superphosphate 
\Common Salt 
Rotten Dung 
No Manure .. .. ■ 
Quantity 
ot Manurfi 
per Acre. 
Produce 
of each Plot 
of,V 
Produce per Acre. 
cwts. 
4 
2 
2 
tons. 
20 
cwts. 
1} 
tons. 
20 
Stones lbs, 
98 2 
90 
67 
54 
89 
51 
86 0 
75 12 
58 10 
Tons cwts. lbs. 
12 5 40 
11 5 40 
8 9 12 
6 15 80 
10 15 0 
9 9 72 
7 6 88 
11 
6 
2 56 
7 50 
The two unmanured plots yielded on an average 6 tons 11 
cwts. and 68 lbs. per acre ; and the two plots to which rotten 
dung was applied on an average 11 tons 3 cwts. and 104 lbs. 
On the 14th of July the potato field presented the following 
appearance : — 
1. Strong luxuriant plants ; colour of tops dark green ; to all 
appearance the best of the experimental plots. 
2. Good healthy plants ; colour of tops good ; nearly equal to 
Plot 1. 
3. Weak tops, of a pale sickly colour. 
4. Nearly equal to Plot 3, but tops a better colour. 
5. Strong healthy plants ; dark green tops ; nearly equal to 
plot 1. 
6. Strong healthy-looking plants ; colour of tops darker 
green than on any of the other plots. 
2 F 2 
