Importance of Nitrogen to Grow*th of Plants. 



233 



The main value of these different series Hes in the dupHcation of 

 results. In these trials clearly the plats on which the " weeds " grew 

 contained less moisture than on similar made plats kept cultivated. The 

 next table gives the yields of maize and weeds obtained : 



Table V. 



Gives the Yields per Plat of Maize and "Weeds." 

 series i. maize with rye. 



SERIES II. MAIZE WITH MILLET. 



I 

 2 



3 

 4 



SERIES III. MAIZE WITH WEEDS . 



103.8 



53-9 

 104. 1 

 172 . 1 



42 



45 



33 

 26 

 42 



47 



35 

 1 1 



32 

 58 



It is noticeable that the yield of ear maize was much greater where 

 weeds were not allowed to start until June 27 instead of on June 14, 

 although the difference in the percentage of moisture in both series of 

 plats is nearly the same. This is the period when maize needed an abund- 

 ance of nitrogen but is not likely to suffer for want of moisture. The 

 amount of water-soluble nitrogen is shown in the next table: 



Table VI. Gives the Determination of the Water-Soluble Salts and 



Nitrogen 



