Uepori on the Field and Feeding Fxperiments at Woburn. 281 
year, the ten years' average being 23 bushels. Mineral manures 
alone gave 22'1 bushels; ammonia-salts alone, 30'3 bushels; 
and nitrate of soda alone, 30 '7 bushels. The last two results 
are nearly identical, which is unlike what was noticed in the 
case of the wheat crop ; both are, however, considerably below 
average. Ammonia-salts combined with mineral manures gave 
only 3 bushels per acre more, but nitrate of soda raised the 
produce by 13 bushels. These nitrogenous top-dressings, when 
used, as with the wheat, in double quantities, produced in either 
case 10 bushels more than when used in single amount; the 
yields were — with ammonia-salts and minerals, 43 bushels ; 
with nitrate of soda and minerals, 54'1 bushels. This latter 
result is the only one which reaches the average of the ten 
former years. 
Where nitrogenous manures, applied last in the spring of 
1886, were omitted for a single year, the produce fell to 29-G 
bushels in the case of ammonia-salts, and to 25'8 bushels in 
that of nitrate of soda, thus showing, as with the wheat, that 
there was more residue left from ammonia-salts than from 
nitrate of soda, and also that there is more residue of these 
nitrogenous top-dressings available for a subsequent barley than 
for a wheat crop, when each is grown continuously. The appli- 
cation of 4 tons and of 8 tons per acre of farmyard manure 
gave increases of 5 bushels and 1 2 bushels per acre respectively. 
Reference is here directed to a summary by Sir J. B. Lawes 
of the continuous wheat and barley experiments during ten 
years, 1877-8G, which appears in another part of the present 
number of the ' Journal.' 
The Rotation Experiments. 
It will be borne in mind that, on the conclusion of the 
second 4-course rotation in 1885, an altei'ation of the original 
plan was made, in consequence of decorticated cotton-cake not 
having shown itself superior as a manure to maize-meal similarly 
used. With the object of testing if this was due to any over- 
fertility of the land, and with the view of exhausting this, if 
existing, the four plots of each rotation were divided by a cross- 
path into eight plots of half an acre each. On four of these plots 
the rotation is continued as befoi-e, though the manurial treatment 
is not so heavy or so frequently repeated, while on the other four 
plots the same crops are grown in rotation without manure, and 
carried off the land entirely. In this way it is believed the 
true differences of manurial value may be brought out, aud the 
question of over-fertility settled. 
Rotation No. 1. — Four acres. 1885, tares (2 acres); peas 
(2 acres). 188G, wheat (4 acres). 1887, swedes (4 acres). 
