Field Experiments on Mangolds. 151 
Plot 8 Rottou dung 1 ton, or at the late of 20 tons per acre. 
("Mineral superphosphate . 
potash salts . . 
and 
I nitrate of soda .. 
/■Rotten dung . . 
} and 
( Mineral superphosphate . 
{Bone dust 
and 
Mineral superphosphate . 
9 
10 
11 
IGJ lbs. 
11 lbs. ' 
)J 
2 cwts. 
» 
5.i lbs. 
1 cwts. 
10 cwts. 
>> 
10 tons 
?) 
Si- lbs. 
>> 
cwt. 
»> 
16i lbs. 
>l 
3 cwts. 
>? 
Si lbs. 
)J 
11 cwt. 
In this scheme, it will be seen, provision is made for testing 
the effects of potash in conjunction with mineral superphosphate, 
and also for ascertaining what the effect is likely to be if to the 
mixture of potash salts and superphosphate a small quantity of 
sulphate of ammonia or of nitrate of soda is added. 
In pievious years I applied potash salts alone to a variety of 
crops ; but having found that, in most cases, potash salts without 
any other fertilising agents did not do much good, whereas in 
conjunction with superphosphate their application to light land 
had a most beneficial effect, I omitted from the present scheme 
potash salts to be tried by themselves. 
In order to make the experiments comparable with ordinary 
farm practice, one plot was reserved for a full dressing of rotten 
dung, and another received half a dressing of dung and a very 
moderate dressing of mineral superphosphate. Two plots were 
left unmanured ; one right through the middle of the experi- 
mental plots, and the other at one end. A third unmanured 
plot was left at the other end of the experimental field ; but as 
the weighings of the produce on this plot gave quite an abnormal 
result, no furthur reference need be made to it. The foregoing 
manuring experiments were tried last season on mangolds by my 
friends Mr. R. Campbell Ellis, at Iver Moor, near Uxbridge, 
Middlesex, and Messrs. J. Coleman and J. Hull, Escrick Park, 
near Ycjrk, and I have now the pleasure briefly to communicate 
to the readers of this Journal the results of these experiments. 
Field Experiments on Mangolds made by Mr. R. Campbell Ellis, 
at leer Moor, near Uxbridge, Middlesex. 
The mangold seed was sown on the 27th April on the flat. 
The different artificial manures were sown with some ashes, to 
secure their uniform distribution on the land, and harrowed in. 
The seed came up well, and a regular plant was obtained on 
all the plots. 
The roots were taken up on the 2nd November, 1869, topped, 
tailed, and weighed, when the following results were obtained : — 
