294 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 
Variety, ' Hough Giant.' 
Yield per acre. 
Manures appliei 
Saleable 
Small 
Diseasal 
Total 
Decrease 
Loss 
15 tons farmyard manure . 
T. C. 
14 17 
CWT. 
20 
CWT. 
8i 
T. C. 
16 5{ 
T. c. 
£ s. d. 
15 tons farmyard manure . | 
3 cwt. superphosphate . J 
13 13| 
11 
8^ 
14 12f 
1 121 
4 8 6 
No. 3. — Farmyard manure versus farmyard manure and super- 
phosphate. 
^Yhen superphosphate was used in conjunction with farmyard manure 
it diminished the yield. In the case of ' British Queen ' the decrease in 
weight of saleable potatos was 52 cwt. and the increase in chats was 
15^ cwt., leaving a total decrease of 30^ cwt., entailing a loss of 
£1. 9s. 6d. per acre. In ' Hough Giants ' the decrease in weight was 
32| cwt., valued at £4. 85. Qd. 
This decrease was probably due to the effects of the dry season, as it 
was noticed that those potatos which received superphosphate alone, in 
addition to farmyard manure, ripened off much earlier, thus causing the 
increase in chats. It reduced the percentage of saleable potatos by 
6*7 per cent., and increased the percentage of small proportionately. 
The crop was ready to lift a month earlier than those of any other plots 
receiving farmyard manure ; besides, the haulm was weaker and the 
tubers were reduced in size. 
TABLE No. 4. 
The Effects of Niteate of Soda versus Sulphate of Ammonia 
UPON THE Yield. 
Yariety, ' British Queen.' 
Yield per acre. 
Manures applied 
Saleable 
Small 
Diseased 
Total 
Increase 
Net gain 
15 tons farmyard manure ."^i 
3 cwt. superphosphate . l> 
1^ cwt. nitrate of soda . J 
T. C. 
14 U 
CWT. 
30 
CWT. 

T. C. 
15 Hi 
T. C. 
£ s. d. 
15 tons farmyard manure .'"j 
3 cwt. superphosphate . > 
1 cwt. sulphate of ammonia . J 
15 10 
30 
17 0 
1 8| 
4 5 6 
