166 
INVESTIGATIONS ON ROTHAMSTED SOILS. 
Table 88. — Barn field root-crop land, samples collected in April, 1870, after four- 
teen years of Swedish turnips, 1856-1869 (a)— Nitrogen in fine, dry soil. 
Standard manures. 
First 9 inches. 
Farmyard manure 
Farmyard manure and superphosphate 
No mineral manure 
Superphosphate each year; mixed alkaline 
salts, 1856-18(50 
Superphosphate each year 
Superphosphate each year; potassium sul- 
phate, 1856-1860 
Superphosphate each year; potassium sul- 
phate and ammonium salts, 1856-1860 
Second 9 inches. 
Farmyard manure 
Farmyard manure and superphosphate 
No mineral manure 
Superphosphate each year; mixed alkaline 
salts, 1856-1860 
Superphosphate each year 
Superphosphate each year; potassium sul- 
phate, 1856-1860 
Superphosphate each year; potassium sul- 
phate and ammonium salts, 1856-1860 
Third 9 inches. 
Farmyard manure 
Farmyard manure and superphosphate 
No mineral manure 
Superphosphate each year; mixed alkaline 
salts, 1856-1860 
Superphosphate each year 
Superphosphate each year; potassium sul- 
phate, 1856-1860 
Superphosphate each year; potassium sul- 
phate and ammonium salts, 1856-1860 
U5 
CO 
Per ct. 
0. 1449 
. 1438 
,0934 
, 0888 
0660 
, 0727 
062'.* 
0782 
0685 
,0622 
0837 
05S4 
0582 
(1573 
.0630 
.Oli! 14 
. 0674 
.0836 
Standard manures and cross 
dressed with— 
§1*1 
3d a •« a. 
IBS 
OOOI 
wis 
US s 
c 
111 
« 2 x o5 
50 5 a 3 
<x> rs as S 
r o»B 
, » 0) p 3 
1 |Sf § 
of S ^ n/d 
2 O c3 3 
© g MO 
03 gO ' S © 
C 2 -ice "S ca 
S Pico hCh 
DC 
,'og 
£ P-rH O 
Per cent 
0. 1501 
.1398 
.0964 
.0998 
, 0960 
,(I9( HI 
, 0924 
, 0701 
.0736 
,0727 
.0707 
.0691 
0643 
, 0600 
,0640 
0618 
,0546 
,0549 
,0646 
(1456 
Per ct. 
0. 1512 
. 1511 
Per cent. 
0. 1693 
.1470 
. 1010 
,(1949 
,0936 
.0942 
. 0954 
, 0729 
,0796 
0629 
(1625 
(1728 
.0693 
. 0582 
.061 19 
. 0592 
1061 
1056 
1029 
1035 
,0715 
0592 
0593 
0671 
Per ct. 
0. 1592 
.1474 
.1083 
,1036 
1041 
0972 
,0997 
.0699 
. 0(570 
.0670 
0612 
.0570 
.0458 
.0480 
047:; 
,0481 
. 0652 
.0484 .0590 
0551 
0567 
.0526 
. 0661 
.0634 
.0637 
.0668 
.0585 
. 0544 
.0577 
. 0538 
. 0483 
.0541 
.0630 
SUMMARY. 
Means of plats 4, 5, and 6: 
First 9 inches 
Second 9 inches 
Third 9 inches 
0.0896 
.0696 
. 0666 
0. 0958 
.0080 
.0550 
0. 0942 
.0661 
.0535 
0. 1049 
.0671 
. 0552 
0. 1016 
.0644 
.0521 
Mean 
.0758, 
T0728 
~7o713~ 
.0758 
.0727 
a The crops of 1859 and 1860 failed and wore plowed in. 
