POTATO-GROWING EXPERIMENTS. 
293 
TABLE No. 2. 
The Effects of Farmyard Manure alone, compared with 
Farmyard Manure and Artificials, upon the Yield. 
Variety, * British Queen.' 
Yield per acre 
Manures applied 
Saleable 
Small 
Total 
Increase 
Net gain 
15 tons farmyard manure 
T. C. 
14 12f 
CWT. 
30i 
T. C. 
IG 3 
T. C. 
£ s. cl. 
15 tons farmyard manure . . 
3 cwt. superphosphate . . .[ 
1 cwt. sulphate of ammonia . . | 
1 cwt. muriate of potash . J 
IG li 
33 
17 lU 
1 Hi 
2 19 0 
No. 2. — To try the effect of farmyard manure and artificial manures 
containing nitrogen, phosphorus, and potash together. 
The farmyard manure supplemented with artificial manures gave an 
increase of cwt. per acre when compared with farmyard manure 
alone ; 28 cwt. of this increase were saleable potatos, the net gain being 
€2. 19s. per acre. 
This shows that it is advisable to use moderate dressings of farmyard 
manure, and to supplement these with a suitable mixture of artificial 
manures containing nitrogen, phosphorus, and potash. By adopting this 
method the maximum yield can be obtained at the minimum cost. 
The percentage of saleable and small potatos was scarcely altered, 
but the size of the saleable potatos was larger on the plot receiving 
farmyard and artificial manures. No difference could be perceived in 
the foliage. 
TABLE No. 3. 
The Effects of Superphosphate upon the Yield when added 
TO Farmy^ard Manure. 
Variety, ' British Queen.' 
Yield per acre. 
Manures applied 
Saleable 
Small 
Diseased 
Total 
Decrease 
Loss 
15 tons farmyaord manure . 
T. c. 
14 12| 
CWT. 
30i 
CWT. 
T. c. 
IG 3 
T. c. 
£ s. d. 
15 tons farmyard manijre . 1 
3 cwt. superphosphate . J 
12 Of 
45f 
14 Gi 
1 IGi 
7 9 6 
