]\rANUHIX(; OF TLOTS 



71 



receiving different nitrogenous manures. The niinoral nianurin*^ 

 on the strips is as follows :— (1) none ; ('2) phosplioric acid only, 

 no potash or alkali salts ; (:3) potash, magnesia, and soda, im 

 phosphoric acid ; and (4) complete nu'neral manure, supj)IviiiL: 

 both phosphoric acid and the alkaline salts. l\aeh of tlicse is 

 combined with the four different cross-dressin«:s of nitro<'enous 

 manures—Series O no nitrogen, Series A anunonium -.salts, 

 Series N nitrate of soda, and Series C rape cak(\ There 

 are other plots, one of which has received farmyard manurt' 

 each year, and a second which received farmyard manure for 

 the first twenty years but has since been unmanured. 



Table XXVIII. shows the nature and (pianLity of thr 



Table XXVI I L — Experiments on Barley, Hoos Field. Mnnurintj of 

 the Plots per acre per annum, 1852 and since. 



manures applied each year to the plots. Table \ X I X. sh()w> 

 the average production of ^n-ain and straw for ilie whole 

 period, for the last ten years. an<l toi- the single year I'.Hrj. 



