50 



T. Lyttleton Lyon and James A. Bizzell 



nitrogen during its later stages of growth, or it may mean that it merely 

 has a depressing effect on nitrification. 



Comparing the nitrates in the late-planted and early-harvested plats 

 with those in the early-planted and early-harvested plats, it will be noticed 

 that there is a greater increase in the nitrates in the former after the crop 

 has been removed. Thus the very immature crop does not appear to 

 have as depressing an effect as does the more mature one. A comparison, 

 therefore, of the three sets of plats harvested and planted at different 

 times indicates that it is the later stages of gro^vth that interfere most 

 with the process of nitrate formation. 



The nitrates in the planted and the unplanted sections of the plats in 

 cultivated maize, potatoes, and oats for the first and second eight inches 

 of soil are shown in diagrams VI and VII. The moisture content of the 

 soil on all the plats is given in Table 18: 



TABLE 18. IMoisTURE in Planted and Unplanted Sections of Plats, 1911 

 (Percentage of Dry Soil) 



First eight inches 



Plat 



2201, 2209 

 2401, 2409 

 2201,2209 



2401, 2409 



2202, 2210 



2402, 2410 

 2202,2210 ' 

 2402, 2410 

 2203,2211 

 2403,2411 

 2203,2211 

 2403,2411 



2204, 2212 

 2404,2412 

 2204, 2212 



2404, 2412 



2205, 2213 ' 



2405, 2413 



2205, 2213 

 2405,2413 



2206, 2214 

 2406, 2414 



2206, 2214 



2406, 2414 



2207, 2215 



2407, 2415 



Crop 



^laize, mulched 



None 



Maize, scraped 



None 



iSIaize, cultivated 



None 



Maize, har\-ested August 1 . . . . 



None 



Maize, planted June 26, har- 

 vested August 1 



None 



Potatoes 



None 



Oats 



32.1 

 34.1 

 33.4 

 33.6 

 31.4 

 31.4 

 31.3 

 33.2 



32.4 

 32.2 



32.8 



34.0 



33.1 



25.9 

 25.6 

 25.8 

 25.2 

 23.2 

 24.2 

 22.3 

 23.0 



21.6 

 22.0 



21.6 



22 .7 

 IS.l 



22.8 

 23.8 

 16.2 

 16.6 

 24.9 

 26.6 

 24.5 

 25.6 



24.0 

 24.7 



22.2 



24.7 



7.2 



22.0 

 23.4 

 17.9 



21.4 

 16.5 

 20.3 

 18.2 

 21.2 



18.7 

 19.3 



15.6 



19.4 



11.3 



25.1 

 28.5 

 19.2 

 21.8 

 17.7 

 20.8 

 IS. 9 

 21.0 



19.0 

 19.2 



15.9 



18.7 

 12.7 





22.1 

 22.2 

 23.6 

 25.3 

 20.0 

 23.6 

 26.7 

 26.9 



26.4 

 26.3 



25.4 



26.6 



22.3 



go 



P. 

 o 



28.0 

 28.8 

 22.5 

 23.8 

 23.4 

 25.3 

 22.4 

 23.2 



22.0 

 22.2 



21.3 



22.4 



25.9 



28.3 

 28.7 

 27.4 

 27.9 

 26.2 

 26.6 

 26.5 

 26.9 



27:2 

 28.0 



26.1 



26.8 



24.6 



