614 
Rotation of Crops. 
average yield or dry matter per acre was much more nearly 
identical under rotation and under continuous cropping ; though 
upon the whole it was more under rotation. The effects on the 
second crop of the course, of the manurial and other treatment of 
the first crop, is here, then, further illustrated. Lastly, it is to be 
observed, that a larger proportion of the total dry matter of the 
crop is, on the average, accumulated in the straw which is gene- 
rally retained on the farm, than in the grain which is, as a rule, 
exported from it. 
Thus, both the actual and the comparative results clearly 
show, that the successful growth of the barley was directly 
dependent on the supplies within the soil, and that the object 
may be gained, either in a properly manured rotation, or by the 
direct application ot suitable manures, including a liberal 
supply of nitrogen for the immediate crop. Having regard to 
the general economy of the farm, the former plan is as a rule 
the most advantageous ; though, owing to the success with 
which the crop can be grown by direct artificial manures, such 
manures are often used as supplements ; or, sometimes, a barley 
crop is taken after another cereal, by the aid of artificial manures 
alone. 
The Dry Matter in the Leguminous Crops . — The third division 
of the Table (V.) shows the average amounts of dry matter per 
acre per annum in the corn, straw, and total produce, of the six 
crops of beans grown in rotation in the eight years ; also the 
average amounts in the same six years when the crop was grown 
continuously in another field. Below the bean results are given 
the average amounts per acre per annum in the clover grown in 
rotation in the remaining two of the eight years ; and there are 
also given the average amounts over the eight years, in the six 
crops of beans and two of clover. It will be seen, however, that 
there is no entry in the line for continuous crops of clover, for 
the simple reason that, as has been shown in various papers, it 
was found impossible to grow clover year after year on ordinary 
arable land. 
The figures show that, meagre as was the average produce ot 
dry matter in the crops of beans, even when grown in rotation, 
they were much less still when grown continuously. This was 
the case whether we look to the amounts in the corn, the straw, 
or the total produce. Indeed, the lines of total produce show 
that the average amounts in the continuously grown crops were, 
under each condition of manuring or other treatment, less than 
half as much as those grown in rotation. In both cases, there 
was somewhat more with superphosphate than without manure, 
and more still with the mixed manure, including both potash 
