402 Decomposition of Organic Matter in Soil 



to September the measurements reveal no other factor except leaching 

 which would cause loss of nitrate from uncropped soils. It should be 

 noted, however, that only the drain gauges show this relationship, and 





,^. 







Fig. 9. Nitrate on the Broadbalk fallow plots, and amount of drainage water percolating 

 through the 20" drain gauge, this being indicated by the columns. 



not the drains under the actual plots. The number of days on which 

 these ran is considerably lower than those on which the gauges ran as 

 shown by the following table : 



Total ... 



33-70 



20-37 



20 



