conducted at Wohurn during 1877. 
245 
artificial manures estimated to supply the same amounts of the 
most important constituents as the manure from those foods. 
The arrangements adopted to attain this object involve the 
application of the following quantities of manure during the 
rotation of four years. On the cotton-cake acre, besides 
the manure from the litter, mangolds, and wheat-straw chafF, 
used in making the dung, that from 1728 lbs. of decorticated 
cotton-cake will be applied ; 1000 lbs. of the cake having been 
already consumed in the production of the dung for the man- 
irolds, 728 lbs. more will be consumed with the seed crop in 
1879. And, as the mangolds will be consumed on the land 
with the addition of straw-chafF, and the seeds also will be con- 
sumed on the land, only the increase in live-weight, and the crops 
of barley and wheat-grain will be carried off for all this manure 
put on. Then the plot which is to receive, in artificial manure, 
the same amount of nitrogen as that estimated to be contained 
in the manure from the 1728 lbs. of cotton-cake, will have 
.ipplied to it (besides the manure from the litter, and from the 
jnangolds and wheat straw-chaff) 642 lbs. of nitrate of soda, 
which will be distributed as follows: — 248 lbs. to the mangolds, 
124 lbs. to the barley, and 270 lbs. to the wheat; whilst, as in 
the case of the cotton-cake manure, only the increase in live- 
weight, and the barley, and the wheat, will be exported. It 
will be obvious that if, with a view to get a heavy root-crop, 
much more manure had been applied, it would have been at 
the risk of having over-luxuriant and laid corn crops. Indeed, 
from the experience already gained with the continuous barley 
and wheat crops in the same field, the probability is that the 
manures applied will prove sufficient for maximum corn crops. 
Thus, eight of the sixteen acres allotted to rotation have 
already been brought under experiment, and the remaining eight 
v, ill be so next year. Twelve of the sixteen will then be under 
wheat, barley, and mangolds, growing under the influence of 
cake-dung, or maize-dung, or dung made without purchased food, 
but with equivalent artificial manure being applied instead. 
The remaining four acres will be in seeds, commencing without 
manure, but to be treated exactly as the four of Rotation No. 1. 
For the second crop of the continous wheat experiments the 
seed was sown at the beginning of November (1877). The 
manure for the dunged plots was made in the boxes applied to 
tlie land, and ploughed in. The mineral manures have also 
already been applied ; but the ammonia-salts and the nitrate of 
soda will, as before, be top-dressed in the spring. 
Both the continuous wheat and the continuous barley plots 
were kept thoroughly clean during the past season. 
