392 ^ Experiments with different Top-dressings upon Wheat. 
Composition of Wheat Maiiure. 
Moisture 13-60 
*Sulpbate of ammonia 10'97 
, j Soluble nitiogenized organic matter .. .. 8*08 
^(Insoluble uitrogenized organic matter .. .. 14'72 
Bi-phosphate of lime 3*54: 
Equal to bone-earth rendered soluble by acivl (5-52) 
Insoluble phosphate of lime (bone-earth) .. 9'45 
Sulphate of magnesia '61 
Ilydrated sulphate of lime 19'73 
Chloride of sodium (common salt) 16"84 
Insoluble siliceous matter (sand) 2'4(; 
100-00 
*Contaimng nitrogen 2 •32 
Equal to ammonia 2-82 
tContaining nitrogen 3-53 
Eq-aal to ammonia 4 '28 
Total quantity of nitrogen 5*85 
Equal to ammonia 7* 10 
Plot V. — Top-dressed, March 22nd, with Proctor's wheat- 
manure, at the rate of 6 cwts. per acre, cost 2/. 8s. per 
acre. 
Durinfj the first three or four weeks there was no difFerence 
perceptible in Plots IV. and V., but in the beginning of June it 
became plain to a careful observer that the wheat on this plot 
was evidently all the better for the extra dose of manure. 
The wheat continued to improve, and took the lead of the 
experimental plots. At harvest time the wheat on this plot was 
perceptibly higher in straw than on any of the other plots, and 
the ears of com likewise appeared rather longer and better filletl 
than on any of the other portions of the experimental field. The 
reapers, without exception, pronounced the crop on Plot V. tin- 
heaviest of all ; and the correctness of their opinion, it will be 
sho^vn, was fully borne out by the direct weighings of the yielil. 
The contrast in the appearance of this plot and the rest of the 
general wheat-crop was most striking. Although the wheat on 
No. V. was high, it stood perfectly erect at harvest, and pro- 
duced strong healthy straw. 
Plot VI. — Left unmanured. 
The wheat on this plot was fully three inches lower than on 
the preceding plot. Although it was not so dark green as lln- 
crop on Plots 1., II., III., IV., V., it was, nevertheless, healthy- 
looking, but rather thin. 
Plot VII. — Top-dressed with chalk-marl, at the rate of about 
4 tons per acre. 
There was not the slightest difference perceptible in tliis ami 
