The Woburn Field Experiments, 1908. 349 
Experiment with “ Nitrolim ” (Calcium Cyanamide) 
{Butt Furlong ), 1908. 
It was considered desirable to make a trial of the new 
nitrogenous material, “ nitrolim ” (or calcium cyanamide), pre- 
pared from the atmosphere by the aid of a powerful electric 
furnace. As calcium cyanamide, if found to be useful in 
agriculture, is likely to be a rival to sulphate of ammonia, the 
comparison was made between sulphate of ammonia at the rate 
of | cwt. per acre, applied as a top-dressing to barley, and 
calcium cyanamide in quantity to supply the same amount of 
nitrogen. The equivalent weight of calcium cyanamide was 
found by analysis to be 96*3 lb. per acre. The results on the 
barley crop were : — 
Produce of Barley per acre. 
Plot 
• 
Manure per acre 
Head com 
Tail 
corn 
Straw, <fcc. 
Bush. 
Weight 
per 
bushel 
Weight 
Lb. 
Lh. 
C. q. lb. 
1 
“ Nitrolim,” 96 3 lb. 
3409 
660 
45 
20 1 19 
2 
Sulphate of ammonia, 84 lb. 
22-77 
65-5 
34 
16 2 23 
At first sight this would lead to the conclusion that calcium 
cyanamide was the more valuable form for supplying nitrogen. 
It has, however, to be remembered that the Woburn soil is 
decidedly deficient in lime, and the ill effects of sulphate of 
ammonia on such a soil have been brought out in the 
continuous corn-growing experiments. Calcium cyanamide, 
moreover, contains a material quantity of lime, and to this fact 
is to be attributed in large measure the better crop obtained 
with the new material. This is brought out by the experiment 
next recorded, which was made in the same field on plots 
adjoining those first described. 
Experiments on “ Finger-and-Toe ” and the Use of 
Lime {Butt Furlong), 1908. 
In this experiment, lime, in the two forms of ordinary lump 
lime and of ground lime, is being tried as a remedy for “ finger- 
and-toe ” in turnips. The turnips are, however, grown in the 
ordinary rotation course, and not, as in a previous experiment, 
every year. Three plots were marked out, and to one of them 
lump lime at the rate of 2 tons per acre was applied on 
January 11, 1908, 10 cwt. of ground lime per acre being put on 
a second plot at the same date, while the third plot was left 
blank. The crop of 1908 was barley, and the harvest results 
obtained were : — 
