Experimental Crops at Rotliamsted. 
119 
amounts of rain at Rotliamsted, in April, May, June, and July, 
each year, those being the months of active growth of the barley 
crop. 
Taiu.e VIII. 
Dressed Coiin. 
(In bushels of 62 lbs.) 
Total ritonuci:. 
(Corn anil Straw). 
llAINi ALL AT IlOTHAMSTED. 
S 
J 
« 
d Manure. 
Manure and 
)nia-salts. 
Mean. 
. Manure. 
•d Manure. 
Manure and 
snia-salts. 
Mean. 
April. 
May. 
June. 
■July. 
Total. 
3 
O 
rt 
Mineral 
Ammc 
g 
Mineral 
Ammi 
Bush. 
Bush. 
Bush. 
Bush. 
lbs. 
lbs. 
lbs. 
lbs. 
Ins. 
Ins. 
Ins. 
Ins. 
Ins. 
1868 .. .. 
lU 
37t 
32 
1902 
5281 
4311 
3831 
2-19 
0-73 
0-37 
0-37 
3-66 
1870 .. ■ .. 
131 
52i 
41f 
351 
1489 
4949 
4287 
3575 
0-45 
1-35 
0-98 
1-12 
3-91 
kVerage, 19Years, 7 
1852-1870 . . ; 
20 
501 
m 
39J 
2433 
5856 
5786 
4698 
1-72 
2-36 
2-43 
2-37 
8-88 
As there has been a decline in the produce without manure 
during the latter as compared with the former half of the period 
over which the experiments have extended, the difference indi- 
cated between the unmanured produce in the years of drought 
and that over the nineteen years will exaggerate the deficiency 
due to the deficient rainfall alone during the four growing months 
of the two years in question. On the other hand, the produce 
by farmyard manure has considerably increased during the latter 
half of the period, and hence the deficiency in the years of 
drought which the figures show for that manure is less than 
is due to the characters of the seasons alone. With the artificial 
manure the produce was, however, very much more nearly 
equal during the first and second halves of the total period, 
and the indicated deficiency in the years of drought probably 
more nearly represents that really due to the characters of the 
seasons in its case. With this manure there was a deficiency 
compared with the average, of 11 bushels of corn in 1868, and of 
6f bushels in 1870; or, of total produce, of 1475 lbs. in 1868, 
and of 1499 lbs. in 1870. There was not far from an equal 
total amount of rain during the four months in the two seasons ; 
but whilst there was more than an average fall in April, 1868, 
and only about one-fourth the average fall in April, 1870, there 
was a greater deficiency in May, June, and July, 1868, than in 
the same months in 1870. The result was a greater deficiency 
of corn, but a less deficiency of straw, in 1868 than in 1870. 
We are enabled to adduce more direct experimental evidence 
