154 Field Experiments on Mangolds. 
Experiments on Mangolds at Escrich Park (^continued). 
Plots of 1 
an acre. 
Manure per Acre. 
Produce per Plot of 
>. of an Acre. 
20 
Produce per Acre. 

Tons, 
cwts. 
lbs. 
Tons. 
cwts. lbs. 
5 
Peruvian Guano .. .. 3cwts. .. 
1 
4 
84 
24 
15 0 
6 
1 
1 
0 
21 
0 0 
/■Mineral Superphosphate 3 cwts. . . 1 
1 and 1 
1 
7 
J 1 
10 
28 
30 
5 0 
1 and 
(.Sulphate of Ammonia.. 1 cwt. ..) 
1 
8 
Rotten Dung .. .. 20 tons.. 
I 
10 
56 
30 
10 0 
1 Mineral Superphosphate 3 cwts. .. i 
and 1 
1 
9 
< Potash salts .. .. 2 cwts... > 
, 1 
11 
84 
31 
15 0 
1 and 1 
1 Nitrate of Soda .. .. 1 cwt. .,) 
1 
(Rotten Dung .. .. 10 tons..! 
10 
and 
1 
14 
28 
31 
5 0 
I Mineral Superphosphate licwt ..) 
1 and 
1 
7 
84 
27 
15 0 
(Mineral Superphosphate 1 J cwts. | 
The preceding tabulated results exhibit several points of 
interest, on which a few observations may be offered : — 
1. In the first place, it will be seen that the two unmanured 
portions of the experimental field yielded a fair crop of mangolds. 
One of these plots produced 22^ tons per acre, and the other 
21 tons ; or, on an average, the unmanured plots produced 
21^ tons of mangolds per acre. The difference in the weights 
of the crops on Plot 1 and Plot 6 is not greater than can be 
expected in field experiments. The experimental field thus 
was tolerably uniform in character and well adapted for the 
trials. 
2. Mineral superphosphate alone gave only an increase of 
IJ tons, and thus appears not to be the kind of manure which 
ought to be employed for mangolds on light land. 
3. The addition of 2 cwts. of salts of potash to 3 cwts. of 
mineral superphosphate proved very successful, inasmuch as it 
raised the produce to 29|- tons, and gave an increase of 7-| tons 
over the average yield ol the unmanured portions of the field. 
4. In these experiments, the addition of 2 cwts. of salts of 
potash had a better effect than the addition to superphosphate 
of 1 cwt. of Peruvian guano, or than 3 cwts. of Peruvian guano 
alone. 
5. Peruvian guano alone answered better than mineral super- 
phosphate applied by itself, but did not appear to be the best 
artificial manure that can be used on light land for mangolds. 
