12 Mr. A. D. Hall and Dr. N. H. J. Miller. [Mar. 30, 



Table VII gives the percentages of calcium carbonate found in the soils 

 of the Agdell and the Little Hoos Fields, which are not speeificallv 

 manured. 



Table VII. — Calcium Carbonate per cent, in Fine Soil dried at 100° C. 



Agdell Field. 





1867. 



1874. 



1883-4. 



1905. 



1st Depth (1 — 9 inches). 



TJnmanured ... 

 Unman ured ... 



5-815 

 5-912 



5- 984 



6- 414 



5 -102 

 4-927 



4-522 

 4-567 



2nd Depth (10—18 inches). 



TJnmanured ... 

 TJnmanured ... 



0-304 

 -220 



0-514 

 0-767 



0-137 

 0-134 



0-195 

 0-138 



Little Hoos Field. 





1873. 



1904. 



1st 9 inches... 

 2nd 9 inches... 



3 -974 

 -145 



2-704 

 0-118 



Lastly in Table VIII the rates of loss in all cases are brought together for 

 comparison. In calculating these rates of loss the earliest samples (1856) 

 from the Broadbalk Field have been rejected as not comparable with the 



Table VIII. — Eate of Loss of Calcium Carbonate from Soil, lbs. per Acre 



per Annum. 



Broadbalk 

 wheat. 



Hoos 

 barley. 



Agdell 

 rotation. 



Little Hoos, 

 various. 



TJnmanured 



Mineral manures only 



„ + 200 lbs. ammonium salts 



+ 400 lbs. 



+ 600 lbs. „ „ 

 „ +275 lbs. sodium nitrate .. 



200 lbs. ammonium salts only 



400 lbs. „ „ 



275 lbs. sodium nitrate only 



Farmyard manure 



Rape cake 



800 



880 

 1170 

 1010 

 1170 



565 



1045 

 590 



1000 



675 

 790 



465 

 760 



725 

 830 

 755 



/ 922 "I 

 \ 938 J 



1046 



