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surface soil ; the land was in poor condition, and had not received 

 dung for many years previously. The land was given a uniform 

 manuring of 336 Ib. of superphosphate (376 kgs per hectare) 

 (37 per cent, soluble) per acre, then each plot, except the two 

 control plots, received 50 Ib. (56 kgs per hectare) of nitrogen per 

 acre in one of the selected forms nitrate of soda, nitrate of lime, 

 sulphate of ammonia, and calcium cyanamide. 



The crop selected for experiment was barley Archer's Stiff 

 Straw; but owing to the cold and wet character of the season, 

 the amount of nitrogen applied was too large, despite the poor 

 condition of the soil, so that the plants on all the plots receiving 

 nitrogen became much laid during July. In consequence, the plots 

 had to be cut by the scythe, and the weights of straw are not very 

 trustworthy owing to the difficulty of cutting them uniformly. 



The manures were applied on March 8th and ploughed in, but 

 showery weather followed, and it was not possible to sow the barley 

 until April 6th. 



The following table gives the details of the yield on the ten 

 plots, there being duplicate plots for each manure: 



EXPERIMENTS ON BARLEY WITH NITROGENOUS FERTILISERS, 

 LITTLE HOOS FIELD, ROTHAMSTED, 1909. 



