326 



Eainfall in inches 



T — I — \ — r 



Eain Falling at Rothamstecl 



Nitrogen in lbs. per acre 



as NH3 as N2O5 — 



1 1 1 r 



_] I I Iri 



- 350 



300 



250 



0200 



150 



100 



8EPT OCT NOV DEC. JAN | Qg MAR APRIL MAY JUNE JULY AUG 



Sept. 1, 1888-Aug. 31, 1892. 



Q ncn SEPT OCT NOV DEC JAN FEB MAR APRIL V JUNE JULY AUG 



050 



Sept. 1, 1892-Aug. 31, 1896. 



n 1 1 1 1 r 



SEPT OCT NOV DEC JAN FED MAR APRIL MAY JUNE JUlV AUG 



1 08 



Sept. 1, 1896-Aug. 31, 1900. 



J I I I I L 



0350 



300 



250 



-0 200 



150 



100 



SEPT OCT NOV DEC JAN FEB MAR APRIL MAY JUNE JULY AUG 



Sept. 1, 1900-Aug. 31, 1904. 



050 



Fig. 4. Monthly fluctuations in amounts of nitric and ammoniacal nitrogen in rainwater; four year 

 periods between Sept. 1, 1888 and Aug. 31, 1916. 



