THE BROADBALK WHEAT soils. 
15 
The tables aboul to be given show tin* percent aires of stones, fine 
dry soil, stubble and roots, and moisture in the Rets of samples taken 
in the three years 1865, 1881, and 1803, while a further table is added 
giving a general summary of those preceding it. 
Table 2. — Brnadbalh >r},,nt soils (s(i)upln/ in October, 1865) — Percentages of 
stones, fine dry soil . Hubble and roots, etc.. and moist" rt in Mma as mtmpled. 
Plat 8 
First inches. 
P.rt. 
P.ct. 
74.57 
Plat :t 
Plat ">a . . . . 
Plat 7a.... 
Plat '.'.i 
Plat H»a .. 
Plat 11a. .. 
Plat 12a... 
Plat i:ia .. 
Plat Ha . 
Plat I'm 
i:» »., 
ii 88 
17 
:.l 
1- m; 
18.00 
Ml .29 
Ifl H 
LB M 
W Ifl 
:i K 
n n 
n 7» 
n n 
r.i. H7 
78. IS 
78. 
7:1 t'4 
U 56 
78.08 
Second 9 inches. 
P.ct. 
o. 01 
P.ct 
in 8B 
eluding plat 2. 10. U 7:i. 7s 
.05 
10.87 
1.08 
K.liT, 
!• 16 
8.21 
8.47 
8.09 
9. v.* 
II .Vi 
9.40 
9.01 
P et 
11. {H 
9 71 
11.07 
- 87 
lo 11 
lo. B7 
18.84 
12. 42 
18.88 
i n 
12 !»s 
/' rt. 
N Vs 
P.ct 
0.01 
11. (El 
71 88 
7.V O 
7« it! 
: sh 
7». 18 
7o. a 
71.37 
78 n 
70.18 
71 17 
72 lis 
.01 
12 2:1 
Third !• inches. 
i 
P.ct 
7. I'.' 
18 BO 
18.61 
18.61 
17.01 
il '.is 
l»i. IV4 
16 a 
i:, -il 
21 »'.» 
18 H 
l»i. 251 
4. :»1 
7.20 
4 14 
l 78 
lit. (C{ 
'.» IMI 
6. ft' 
5. 12 
7. :u; 
4.70 
Per 
71 17 
P. cf. 
il. .M 
77.19 
76. 17 
79.40 
7!». 68 
74. 11 
72 66 
7:, m 
74 70 
::i Ifl 
71 19 
7:». 57 
o nl 
P. rt. 
lN.Ol 
18.30 
17.88 
16.68 
is .HI 
16 98 
17.84 
18.87 
17. is 
18. 17 
80 -l 
1- 09 
a Stones retained by i-inch sieve. The fine dry soil includes stones passing through a i-inch 
"•it'V.". 
Iii 1 si;.') eleven plats only were sampled to the depth of l } 7 inches. 
From the laboratory reeords it appears that in that year (1865) the 
samples were preserved for some time before the determinations of 
moisture were made, so that the percentages of moisture shown do 
not represent the amounts and condition of the samples as collected, 
a fart which of corns.' atTects the proportions of the other matters. 
It is nevertheless seen thai the percentage of stones is highest in the 
surface soil, considerably lower in the second depih, and very much 
lower in the third. We see, moreover, considerable variation in the 
percentages of stones in the samples taken at the same depth from 
the different plats, this being especially the case in the subsoils. 
This irregularity in the proportion of stones and fine soil is, indeed, 
characteristic of the Kothamsted subsoils, and unfortunately the vari- 
ations, even in different parts of the same plat, make it impossible to 
strike for the mineral constituents of the subsoil — such, for example, 
as phosphoric acid — a capital debtor and creditor account that can be 
analytically checked, although it is sometimes possible to do this with 
some degree of success in the case of the surface soil. This difficulty 
is, of course, much greater in the case of the " fixed" constituents of 
the soil — like organic nitrogen and phosphoric acid — and of the par- 
tially fixed "'constituents, like potash, than of the soluble or "migra- 
tory" constituents, like nitrates or chlorids. 
