Experimental Plots at Rothamsted, from 1864 1883. 423 
average, it Avas not considered that more than an average crop 
was grown throughout the country. 
Table XX.— Summary of the Eesults of the Fortieth Season, 1882-83. 
riots. 
Manure?. 
(Quantities per Acre.) 
Produce per Acre, &c. 
Dressed Corn. 
Total 
Coru. 
Straw 
and 
Chaff. 
Quantity. 
Weight 
per 
Bushel, 
3 
2 
10a 
9b 
5a & B 
6a & b| 
7a & b| 
- ( 
?A & b| 
400 lbs. aiuinoniurn-salts alone = 86 Iba. N. 
550 lbs. nitrate of soda alone = 86 lbs. N. 
200 lbs. ammonium salts = 43 lbs. N. . . / 
400 lbs. ammonium-salts = 86 lbs. N. 
550 lbs. nitrate of soda = 86 lbs. N. .. / 
600 lbs. ammouium-salts — 129 lbs. N. .. / 
bu*h. pks. 
13 3i 
35 Oa 
17 2 
19 OJ 
15 2f 
27 2i 
36 0^ 
43 li 
41 31 
lbs. 
61-2 
62 '4 
60- 4 
59-6 
61- 9 
62- 8 
62-9 
62- 1 
63- 5 
lbs. 
872 
2244 
1196 
1009 
1781 
2378 
2905 
2783 
lbs. 
1(J06 
2930 
1419 
1684 
1138 
2605 
3632 
5127 
4291 
Estimated average for the United Kingdoml q 
610 
Best and Worst Seasons. 
Every one engaged in farming knows that the growth of his 
crops is dependent upon the weather ; still, the treatment of 
land in common practice is not so uniform as to enable any one 
to measure the influence of climate upon any particular crop,. 
To do this the crop must be grown continuously upon the same 
land, and no change must be made in the manures applied. 
During the period of forty years that has elapsed since the 
commencement of the continuous wheat crop, it is probable that 
we have experienced fluctuations of season as great as are likely 
to occur in any similar period. In the following table (p, 424) 
will be found the produce of selected plots, in the year of the 
greatest produce, 1863, and in that of the worst produce in 
1879, together with the average produce of the period of thirty- 
two years. 
The reason for giving the average of the last 32 years, 
instead of that of the whole period of 40 years, is that in the 
early years of the experiments some changes in the manures 
applied took place on certain plots, while for the last 32 
years, the same manures have been used almost without change. 
VOL. XX. — S. S. 2 F 
