84 



NITROGENOUS MANURES 



[chap 



witli good quality in wheat ; yet the flour made from 

 the grain of the plots on the Broadbalk field, which 

 received the highest amount of nitrogen, gives rise to 

 such a loose, unstable dough that it can hardly be 

 formed into anything resembling a loaf. 



Table XXIII. shows the percentages of nitrogen in 

 the grain and in the flour made from the grain grown 

 in 1903 on certain of the Rothamsted plots, which vary 

 greatly as regards their nitrogen supply. 



Table XXIII.— Nitrogen in Wheat Grain and Flour. 

 Bkoadbalk, Rothamsted, 1903. 



The variations in the nitrogen content of the flour 

 are extreme, ranging from 1-462 for the unmanured 

 plot to 2-014 for the dunged plot The increased 

 nitrogen thus obtained did not, however, result in the 

 stronger flour which is associated with a higher nitrogen 

 content when wheat is grown under more normal 

 conditions, the loaves made from the grain of Plots 2 to 

 10 being very greatly inferior to that made from the 

 grain of the unmanured plot. This only shows that 

 such a characteristic as the strength of wheat — the 

 quality, as the practical man would term it — is as a rule 

 due to some more subtle combinations than are measured 

 in ordinary analysis. In this case strength is not to be 

 measured by the nitrogen content, though the two 

 often vary together. 



