46 T. Lyttleton Lyon and James A. Bizzell 



was to see whether the maize would cause the nitrates to increase in the 

 oat soil and thus overcome the depressing effect of the oats. 

 The plat treatments may be briefi}' stated as follow^s: 



Plat 



Crop and soil treatment 



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 planted May 20. Mulched 



Maize planted IMay 20. Scraped 



Maize planted Ma}' 20. Cultivated all summer 



Maize harvested August 1. Cultivated all summer 



Maize planted June 26, harvested August 1. Cultivated 



all summer 

 Potatoes planted May 19. Cultivated all summer 

 Oats planted Maj' 9. Cultivated after harvest 

 Oats planted May 9, followed by maize. Cultivated 



after oat harvest 



The temperature during the growing season was nearly normal. There 

 was a deficiency of rainfall, especially during August, at which time the 

 maize suffered from lack of moisture. Oats made a normal growi:h, as 

 did also potatoes. A killing frost on September 14 stopped growlh of 

 all crops on that date. 



The soil was manured for all crops in the early spring, at the rate of 

 about five tons of farm manure per acre. This was not sufficient to 

 produce an average yield of maize on the heavy soil of these plats, but 

 the growth of this crop was better than in 1910. 



Soil samples for moisture and nitrates were taken to a depth of eight 

 inches from the surface, and also to a depth of eight to sixteen inches. 

 The plats were of the same size as those used in 1910 and each was divided 

 into three sections: the north and the south sections were planted to 

 a certain crop; the middle sections were unplanted and were given the 

 same treatment as the planted sections. Each section of every plat was 

 sampled separately, the sample consisting of three borings. 



The results of the determinations of nitrates on the middle sections, 

 representing the unplanted soil, and the averages for the north and south 

 end sections, representing the planted soil, are presented in Table 17. 

 The table gives the nitrates in parts per million for the surface eight 

 inches and for the second eight inches, and the averages of these two 

 depths : 



