172 
INVESTIGATIONS ON KOTHAMSTED SOILS. 
Table 90.— Agdell field experimental rotation land— Soil samples collected in 1867 
(after wheat), 1874 (after clover), and 1883-84 (after wheat)— Nitrogen per acre 
in fine dry soil of first 9 inches. 
UNMANURED. 
Plats. 
Samples collected in— 
Mean. 
Novem- 
ber, 1867 
(after 
wheat). 
October, 
1874 (after 
clover). 
Novem- 
ber, 1883, to 
January, 
1884 (after 
wheat;. 
Fallow: 
Roots carted 
Roots fed 
21 and 22 
17 and 18 
Pounds per 
acre. 
3,127 
2,959 
3,043 
Pounds per 
acre. 
3, 113 
2,976 
2, 955 

Pounds per 
acre. 
2,952 
2,724 
2,838 

Pounds per 
acre. 
o, Jo4 
2,826 
2,945 
Beans or clover: 
Roots carted 
Roots fed 
23 and 24 
19 and 20 
3,127 
3.113 
■ 
3,307 
2,849 
3, 139 
2,892 

O 1Q1 
2,951 
Mean 
3, 120 
3, 078 
3,016 
3,071 
Mean of all 
3,082 
3,016 
2,927 
3,008 
Carted: 
Fallow 
Beans or clover 
21 and 22 
23 and 24 
3, 127 
3, 127 
3,113 
3,307 
2,952 
3, 139 
3,064 
3,191 
3,127 
3,210 
3,046 
3.128 
Fed: 
Fallow 
Beans or clover 
Mean 
17 and 18 
19 and 20 
2,959 
3.113 
2, 796 
2,849 
2. 724 
2,892 
2, 826 
2, 951 
3,036 
2,823 
2,808 
2,889 
Mean of all . . 
3,082 1 3,016 
2,927 
3,008 
SUPERPHOSPHATE. 
Fallow: 
Roots carted 
13 and 14 
2.938 
2,976 
2,753 
2, 702 
2,786 
2,947 
2,826 
2,875 
Roots fed 
Mean 
9 and 10 
2, 957 
2,728 
2,867 
2, 851 
Beans or clover: 
Roots fed 
Mean 
15 and lt> 
11 and 12 
3, 185 
3.312 
3,249 
2,978 
3,170 
3,074 
2,897 
3,110 
3, 004 
3,020 
3, 197 
3, 109 
Mean of all 
3, 103 
2,901 
2,935 
2,980 
Carted : 
Fallow 
Beans or clover 
Mean 
13 and 14 
15 and 16 
2,938 
3, 185 
2,753 
2,978 
2,786 
2,897 
2,826 
3,020 
3, 062 
2, 866 
2,842 
2,923 
Fed: 
Fallow 
Beans or clover 
Mean 
9 and 10 
1 1 and 12 
2,976 
3,312 
2,702 
3,170 
2,947 
3,110 
2,875 
3, 197 
3. 144 
2,93(5 
3,028 
3,036 
Moan of all 
3. 103 
2,901 
2,935 
2,980 
