24 INVESTIGATIONS ON ROTHAMSTED SOILS. 
Table 7. — Broadbalk wheat soils, actual and calculated weights per acre of fine 
dry soil, of plats 2a, 2b, and 19, at different depths (first 9 incites). 
Year of sampling. 
Actual 
weight of 
fine dry soil 
per acre. 
A QC11 TV* 1 Tl Ct 
A o o LI 1JJ. x LI g 
2,592.621 
pounds in 
1884 for 2a. 
and in 1843 
for 2b, and in 
1878 for 19 (as 
adopted for 
all dates for 
all plats ex- 
cept 2 and 
19). 
Number of 
years be- 
tween 
starting 
point and 
each sam- 
pling. 
Reduction 
of weight, 
if at same 
rate per 
annum. 
Vv<*lL> UIB Ltr^l 
weight of 
fine dry soil 
per acre at 
each date 
(starting- 
point weight 
less assumed 
reduction 
oyer succes- 
sive peri- 
ods). 
Actual 
(+ or—) 
calculated 
weight. 
Plat 2a: 
1843 
Pounds. 
(a) 
2,510,185 
Pounds. 
2,592,621 
2,510, 185 
82,436 
9,160 
2,592,621 
2,333,891 
258, 730 
5, 174. 6 
2,592,621 
Years. 
Pounds. 
Pounds. 
Pounds. 
1893 
Difference in 9 
years 
Difference per an- 
num 
Plat 2b: 
1843 
(a) 
62,430,363 
2,456,509 
2,333,891 
2,592,621 
2,478,780 
2,395.980 
2,333,891 
1865 
1881 
1893 
22 
38 
50 
113, 841 
196,635 
258,730 
-58,417 
+60,523 
Difference in 50 
years 
Difference per an- 
num 
Plat 19: 
18786 
(a) 
2,462,780 
2,579,942 
1881c 
3 
15 
2.536 
12,679 
2,590,085 
2,579,942 
1893 
2,579,942 
12,679 
845.3 
Difference in 15 
years 
Difference per an- 
num 
a Not sampled. 
6 All 1865 first 9 inches assumed to be one-ninth too low; hence actual weight, 2,178,327 pounds, + 
one-ninth (242,036 pounds) = 2,420,363 pounds, assumed corrected weight. 
cl878, the commencement of a large increase in the amount of rape cake applied per annum is 
adopted as the starting point in this case. 
The following table (Table 8), abstracted from the foregoing tables, 
gives at a glance the final adopted weights : 
Table 8. — Weights per acre of fine dry soil adopted for the Broadbalk wheat plats. 
[Extracted from Tables 6 and 7.] 
First 9 inches: Pounds. 
For all plats, excepting 2a, 2b, and 19 for each year, 
1865, 1881 , and 1893. 2, 592, 621 
For plat 2a in 1893 2, 510, 185 
For plat 2b in 1865 2, 478, 780 
For plat 2b in 1881 .. . 2,395,986 
For plat 2b in 1893 2, 333, 891 
For plat 19 in 1893 2, 579, 942 
Second 9 inches: 
For all plats in each year 2, 671, 321 
Third inches: 
For all plats in each year 2, 791. 501 
Lower depths, for all plats: 
Fourth 9 inches _ 2, 783, 485 
Fifth 9 inches ... 2, 865, 549 
Sixth 9 inches 2, 836, 890 
Seventh 9 inches 2, 852, 599 
Eighth 9 inches 2, 868, 308 
Ninth 9 inches 3,003,479 
Tenth 9 inches ' 3,001,755 
