E. J. Russell and A. Appleyaru 



ol 



July and August the nitrates increase instead of falling like the COo. 

 But in November and December the nitrates rise sharply and keep high 

 until the heavy February rains^, when they fell to a minimum just as 

 do the bacterial numbers and the carbon dioxide. 



X26 



S. 

 I 22 



§18 



o 



§14 

 5= 



0-8 



•30-4 -^-^ 



=0'2 



0-0 



0-9 



0-6 S. 



c 



0-2 



24 "S 

 16<S 3 



8 g: 



.Time -Tilly Aug. Sept. Oct. Nov. Dec. Jan. Fell. Mar. Apr. May June July Aug. Sept. 



Fig. 14. Curves .showing rainfall, bacterial numbers in soil, CO, in soil air and nitrate 

 in soil of Broadbalk dunged plot. 



' The rainfall for December 1913 and January 1914 was considerably below the average 

 so that the washmg out of nitrate began later than usual. The rainfall figures are: 



December January 

 Average 1853-1913 2-44 2-35 



This year .. 0-88 0-88 



It is interesting to note that, when the diains began to rmi in February 1914, the 

 drainage water was of appro-ximately the same order of concentration as after the similar 

 winter conditions of 1879-80: 



N as nitrate in drainage water from Plot 2 (dunged) 

 February 1914 26-8 29-7 parts per million 

 1880 27-3 



