MANURING OF POTATOES. 205 
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‘yard manure. The addition to dung of a complete dressing 
of artificials, consisting of 4 cwts. superphosphate, 13 cwts, 
nitrate, and 2 cwts. kainit per acre, did not result in any 
increase over the plots which received farmyard manure only, 
except in one case, and then only of about 11 cwts. The 
table shows the results obtained both from the plots which 
received farmyard manure only, and from those which 
received in addition a comnlete dressing of artificials. It 
may be observed that the yields on the two unmanured plots 
Mere szstons 7 Ccwts. I qr, and 7 tons 2 cwts. per acre 
respectively. 
Dung with complete 
dressing of 
Dung only. Artificials. 
Tons cwts.  qrs. Tons cwts. qrs. 
10 loads farmyard manure Rawle IO Oo II 10 O 
iS i See 59 59 2 jt II 2 Il 9 O 
20) | _,, 55 “A rea) 12 Oe 12 3 I 
25F 5; 30 5H = EI 16 3 Te 4 3 
The plots treated with artificials alone yielded consider- 
ably less than those which received dung in conjunction with 
artificials, but satisfactory results were only obtained when 
all three ingredients, phosphorus, potash and nitrogen, were 
present ; the omission of any one of them caused the crop to 
fall almost to the level of the unmanured plots. As will be 
seen from the following figures Nitrate of Soda gave better 
results than Sulphate of Ammonia :— 
Yield per Acre. 
Tons cwts. qrs. 
4 cwts. Super., 14 cwts. Nitrate, and 2 cwts. Kainit 9 17 I 
13 cwts. Nitrate - - - - - eS fe) 2 
2 cwts. Kainit - - - 7 15 2 
4 cwts. Super. - - - - 7 14 2 
14 cwts. Nitrate and 2 cwts. Kainit - - 8 12 3 
2 cwts. Kainit and 4 cwts. Super. - 5 13 B 
15 cwts. Nitrate and 4 cwts. Super. - - . 5. AG IO 2 
2 cwts. Kainit, 4 cwts. Super, and 1f cwt. Ammonia 7 19 oO 
2 cwts. Kainit, 4 cwts. Super, 8 cwt. Nitrate, and \g 7 - 
£ cwt. Ammonia- - - - - - - 
No Manure - - - - - - - - ie ds - 
Compared with the unmanured plots it will be observed 
that the increase which was obtained by the use of 10 loads 
of dung exceeded 4 tons per acre, while the largest increase 
obtained with artificials alone was about 2} tons on the plot 
where a complete dressing was applied. 
Experiments which were carried out on light land at Blid- 
