WHEAT. 



175 



between nitrogen accumulation, chlorophyll-formation, and 

 carbon assimilation. 



TABLE 49. — Relation of Carbon assimilation to Nitrogen 



ACCUMULATION, AND TO CHLOROPHYLL FORMED. 



■i The figures given in parentheses are on the only partially dried substance. 



It should be observed that the amounts of chlorophyll 

 recorded are as stated, relative, and not actual ; and the 

 figures show the relative amounts for the individual members 

 of each pair of experiments, and not the comparative amounts 

 as between one set of experiments and another. It should 

 be further stated that the chlorophyll determinations were 

 kindly made by Dr W. J. Eussell, F.E.S., of London, in 

 specimens collected at Kothamsted, whilst the wheat and 

 barley were still green and actively growing. 



It will be seen, in the first place, that the separated Nitrogen 

 leguminous herbage of hay contained a much higher per- and p r °- 



& p. ..,- 7 , ,. . & *7i portion of 



centage of nitrogen m its dry matter than the separated chioro- 

 gramineous herbage ; and that, with the much higher per- P h y 11 - 

 centage of nitrogen in the leguminous herbage, there was 

 also a much higher proportion of chlorophyll. 



Next, it is to be observed that the wheat plant on plot 10a, 

 manured with ammonium-salts alone, shows a much higher 

 percentage of nitrogen than that of plot 7, with the same 

 amount of ammonium -salts, but with mineral manure in 

 addition. The high proportion of chlorophyll again goes 

 with the high nitrogen percentage ; but the last column of 

 the table shows that on plot 10<z, with ammonium - salts 

 without mineral manure, with the high percentage of nitrogen, 

 and the high proportion of chlorophyll in the green produce, Carbon 

 there was eventually a very much less assimilation of carbon. tionT 1 



