338 
The Woburn Field Experiments , 1908. 
ammonia (as ascertained by analysis of the manure itself when 
put on) per acre being supplied. It may he of interest to note 
that the manure, made in feeding boxes during the early part 
of the year, weighed, on March 19, 1907, when taken out of the 
boxes and put in a heap, 49 cwt. 2 qrs. 7 lb., and when removed 
on October 16 (after being all the time covered over with 
earth), 26 cwt. 2 qrs. 7 lb., the loss in weight being thus 47 per 
cent. The manure was ploughed in at once after spreading, 
the actual quantity going on the land, to supply 100 lb. 
ammonia per acre, being 5 tons 13 cwt. per acre. On 
November 5 “ Square Head’s Master ” wheat was drilled, at 
the rate of 9 pecks per acre, the seed being previously dressed 
with sulphate of copper (bluestone). Mineral manures were 
applied to plots 4, 5, 6, 8, 9, and 10a at the same date. 
November was a cold and wet month, and it was December 5 
before the wheat began to show. Hard frost followed early in 
January, 1908, and at that time plots 8a and 8b (mineral 
manures with ammonia salts, but no lime), were almost blank. 
On February 21 rape dust was applied to plot 10b, the quantity 
being just short of 4 cwt. per acre. The nitrogenous top- 
dressings were given to the various plots on May 11-12 and 
June 4, the heavier applications going on in two dressings. 
By the end of May the No. 2 plots showed very interesting 
differences, for while 2a was almost bare, 2aa had a small crop 
on it, 2b a good one, and 2bb the best, the influence of lime 
thus clearly telling. The wheat came into ear by June 19, 
and at the end of July, owing to the hot weather then 
prevailing, the crop ripened fast, so that all the plots, with 
the exception of 2a, 2aa, 5a, and 8 (ammonia salts) were 
cut on August 11. By August 26 all plots were carted and 
stacked. 
The wheat yield, it will be seen, was quite a good one, 
taking it all round, the unmanured produce being 12^ bushels 
per acre, which is nearly 2 bushels above the average of the 
last ten years. The highest yield was 28^ bushels per acre, 
with minerals and 2 cwt. per acre (practically) of nitrate of 
soda, the same minerals with 1 cwt. per acre of nitrate of soda 
giving (plot 6) 26'2 bushels. Farmyard manure produced 24'3 
bushels, but rape dust only 16’6 bushels. It would appear 
already that the quantity of rape dust used (4 cwt. per acre) is 
insufficient to give a full crop, and is not equal in effect to 
1 cwt. per acre of nitrate of soda (plot 3b) supplying the same 
amount of ammonia, this latter giving 23'7 bushels. As 
between 1 cwt. per acre and 2 cwt. per acre of nitrate of soda 
(plots 3b and 3a) there was only a difference of 2'6 bushels in 
favour of the heavier dressing. A comparison of plots 10a and 
11a would indicate that, so far, the presence of phosphates is 
