THE BBOADBALS WHEAT BOILS. 
49 
is very clearly argued in a Rothamsted paper <k ()n the amount and 
composition of the rain and drainage waters collected at Rothamsted : 
(Lawes, Gilbert, and Warington), published in 1881 and 1882, 1 more 
particularly in that part of the article published in 18Si\ The matter 
was also discussed with you, and illustrated from earlier analyses by 
Professor Warington in his lectures in 1S01, and again in a different 
form, but witli a like purport, by Sir Henry Gilbert in his lectures to 
you in 1 vi.i. Although the matter has been already so fully discussed, 
it has been to me, and I hope may be to you, an interesting task to 
examine some of the further evidence on the subject yielded by these 
latest and most interesting analyses, viz, those of the 181*3 samples to 
which we have so far been confining our attention. 
LOSS OF NITROGEN. 
The following table (Table 26), prepared on I he lines of others used 
in the earlier discussions of the subject, shows at a glance the estimated 
annual removal of nitrogen in crops in fifty years, and the average 
annual accumulation of nitrogen in the surface soil, as compared with 
plat calculated from the present excess found by actual analysis of 
the IS!):} samples. It also shows the nitrogen annually supplied in 
manure, and the balance annually lost by drainage, or at any rate not 
found in the surface soil. 
T \r.u: Ji',. -liroaiHudk reheat soils, sampled in October, /sn.J— Nitkooen in manure, 
crops, awl soil, ami not accounted for, on carious chemically manured plats. 
Nitrogen. 
Plat 
3. 
Plat 
5. 
Plat 
7. 
Plat 
10a. 
Plat 
10b. 
Plat 
11. 
Plat 
It 
Plat 
IS. 
Flat 
14. 
Approximate average annual yield in 
crops over ">u years n 
/As. 
lit 
I.hs. 
34 
Lhs. 
49 
Lbs. 
32 
Lbs. 
:if, 
Lbs. 
39 
Urn. 
41 
Lbs. 
45 
Lbs. 
44 
Average annual yield in excess of plat 8 
i uninanured) 
5 
:»» 
IB 
16 
80 
22 
26 
25 
Average annual accumulation of nitrogen 
in the surface i first !» inches) soil, as com- 
pared with plat :5 1 i. e., one-hftieth of the 
excess over plat :i found !>y analysis 
after SO years) 

1 
U 
4 
4 
7 
101 
9 
134 
Total annual excess over plat 3 in 
crops and in first 9 inches of soil 
1 
42 
17 
86 
2<t 
27 
86 
32* 
86 
35 
384 
86 
Nitrogen supplied annually in manure. 

86 
86 
86 
Balance annually (on the average) 
not accounted for in crops or soil- 
increase in first 9 inches, and for 
the most part lost by drainage 
/>6 
44 
69 
66 
59 
m 
51 
47i 
a This quantity is based on actual analyses of the produce over forty years, and on an estimate 
(made from the crop yield of each plat) for the earner years in which analyses of the grain and 
straw were not made. The average annual estimates, though rough, are probably correct 
within about 1 pound per acre. 
6Gain. 
Actual analyses of the drainage waters running from the pipes show 
quantities of nitrates which go far toward accounting for the lost 
1 Journal of the Royal Agricultural Society of England, 2. ser., 17 (1881) . pp. 241- 
271); 18 (1882), pp. 1-71. 
1)385— No. 106—02 4 
