72 



EXPERIMENTS UPON BARLEY 



Table XXIX. — Experiments on Barley, Hoos Field. Produce of Grain 

 and Straio per acre. Averages over 51 years (1852-1902), find over 

 10 years (1893-1902). Also Produce in 1902. 



- Average, 31 years (1S72-1902). 



Table XXX. shows the average production during each of the 

 successive ten year periods from 1852. 



A. Maintenance of Yield under the Continuous GrowtJi 

 of Barley on the same Land. 



One of the plots, 1-0, has been without manure since the 

 beginning of the experiments. Under the continuous barley - 

 growing the decline in production has been much more marked 

 than on the wheat plot similarly treated, the average crop having 

 been only 10 bushels for the last ten years, against an average of 

 more than 15 bushels for the whole period. The continual fall of 

 crop from decade to decade would seem to show a progressive 

 exhaustion of the soil, without reaching the comparatively stable 

 condition of the continuously unmanured wheat plot. The more 



