Relations of Higher Plants to the Formation of Nitrates 53 



crops and treatments to the nitrate content of the soil. It will be re- 

 membered that the analyses of April 19 to 26 were made before the 

 crops were planted. These data for the surface eight inches, for the 

 second eight inches, and for the average of these two depths, are given 

 in Table 19: 



TABLE 19. 



Ratio of Nitrates in Planted Sections of Plats to Nitrates in 

 Unplanted Sections 



First eight inches 



Plat 



2201, 2209, 



2202, 2210, 



2203, 2211, 



2204, 2212, 



2401, 2409 



2402, 2410 



2403, 2411 



2404, 2412 



2205, 2213, 2405, 2413 



2206, 2214, 



2207, 2215, 



2208, 2216, 



2406, 2414 



2407, 2415 



2408, 2416 



Crop 



Maize, mulched 



Maize, scraped 



Maize, cultivated .... 



Maize, harvested Au- 

 gust 1 



Maize, planted June 

 26, harvested Au- 

 gust 1 



Potatoes 



Oats 



Oats, followed by 

 maize 



96 

 139 

 132 



84 



118 



72 



113 

 102 

 105 



90 



61 



108 



56 



69 



104 

 35 

 11 



DO 



94 

 16 

 34 



89 

 28 

 20 



17 



Second eight inches 



Plat 



Crop 











■* 



00 



o 



o 





^ 



•* 



IN 



O 





§>« 















2 



o 



to 



o 



o 



1 



3 



_X1 



go 



.20 



0, 



a 





3 



M 

 3 



^^ 



ft 



< 



►-5 



>-5 



< 



< 



< 



m 



116 



112 



76 



76 



44 



48 



32 



107 



100 



68 



95 



56 



50 



52 



100 



108 



108 



67 



60 



61 



35 



132 



100 



74 



90 



72 



86 



69 



91 



94 



87 



89 



90 



69 



70 



100 



94 



60 



46 



40 



55 



70 



80 



27 



13 



23 



29 



37 



41 



73 



37 



14 



14 



25 



27 



33 



O tH 



2201, 2209, 2401, 2409 



2202, 2210, 2402, 2410 



2203, 2211, 2403, 2411 



2204, 2212, 2404, 2412 



2205, 2213, 2405, 2413 



2206, 2214, 2406, 2414 



2207, 2215, 2407, 2415 



2208, 2216, 2408, 2416 



Maize, mulched 



Maize, scraped 



Maize, cultivated. . . . 



IMaize, harvested Au- 

 gust 1 



Maize, planted June 

 26, harvested Au- 

 gust 1 



Potatoes 



Oats 



Oats, followed by 

 maize 



57 

 43 

 67 



78 



107 

 44 

 26 



36 



