Experiments with Salt upon Mangolds. 
887 
grown on this light sandy soil was manured with nitro-phos- 
phatc, a sample of which on analysis yielded the following 
results : — 
Composition of a Sample of Nitro-phosphatc used in Mangold Experiments. 
Moisture 19-04 
•Organic matter and water of combination .. .. 18 - f!l 
J5i-phosphatcs of lime 12-78 
Equal to bone-earth rendered soluble (19-93) 
Insoluble phosphates (bone-earth) 9-57 
Sulphate of lime 33-26 
Alkaline salts J/60 
Insoluble siliceous matter .. .. 5 - 14 
100-00 
*Containing nitrogen *S1 
Equal to ammonia '98 
The manure, it will be observed, is essentially a good super- 
phosphate, containing a moderate amount of nitrogenous matter. 
Half an acre of the mangold-field where the plant was most 
even was set aside and divided into 10 parts. Each plot was thus 
l-20th of an acre. A plot in the centre received no salt ; the 
9 others were dressed at the rate of from 1 to 9 cwts. of common 
salt per acre. Eventually another plot of l-20th acre, adjoining 
the half-acre of roots under experiment, was added and left without 
salt. This was done for the purpose of ascertaining how far the 
produce varied in two portions of the same field treated exactly 
alike in every respect. 
The roots were counted on each plot, and, after cleaning and 
dressing, accurately weighed. 
The following table shows the manner in which the experi- 
mental plots were disposed, and gives the produce as obtained by 
actual weight and calculated per acre, and the increase due to 
the application of salt. 
Experiments with Salt upon Mangolds, grown on a poor Sandy Soil. 
Plots of 
JL Acre. 
35 
Salt applied 
per Acre. 
Number 
of Roots 
per Plot. 
Produce 
per Plot. 
Produce per Acre. 
Increase per Acre 
over Un=alted Plot, 
No. 6. 
cwts. 
cwts. lbs. 
tons. cwts. lbs. 
tons 
cwts. 
lbs. 
No. 1 .. 
Nothing 
510 
13 8 
13 
1 
48 
9 
» » * • • 
7 
583 
18 58 
18 
10 
40 
4 
* 1 
SS 
,, 3 .. 
5 
62G 
20 0 
20 
0 
0 
5 
11 
48 
,,4 
3 
600 
16 84 
16 
15 
0 
2 
6 
48 
>. 5 .. 
1 
622 
14 108 
14 
19 
32 
0 
10 
80 
., 6 .. 
Nothing 
615 
14 48 
14 
8 
64 
,, 7 -• 
2 
602 
15 28 
15 
5 
0 
0 
16 
48 
,. 8 .. 
4 
621 
15 65 
15 
11 
68 
1 
3 
4 
.. 9 •• 
6 
631 
16 33 
16 
5 
100 
1 
17 
36 
,,10 .. 
8 
616 
18 9 
18 
1 
68 
3 
13 
4 
,,11 •• 
9 
618 
16 101 
16 
18 
4 
2 
9 
52 
