Soil Nitrate Studies 



271 



that it is in the early spring that crops need applications of quickly 

 available nitrogenous fertilizers. 



TABLE II.— Series 1 West 



D.^TE 



Plot 3 Clover and Timothy 



Moisture 

 Per Cent 



Nitrates — Parts per Million 



Fresh 



Incubated 



II 



Plot 4 Corn 



Moisture 

 Per Cent 



Nitrates — Parts per Million 



Fresh 



Incubated 



II 



April 21... 



May 6 



May 20 . . . 



June 3 



June 17 



July 1 



July 15. . . . 

 July 29.... 

 Aug. 12... 

 Aug. 26. . . 

 Sept. 9.... 

 Sept. 23... 

 Oct. 14.... 

 Oct. 30.... 



Average 



27.70 

 26.71 

 25.09 

 16.08 

 12.32 

 11.23 

 13.87 

 11.43 

 10.31 

 16.96 

 13.19 

 11.36 

 24.96 

 22.89 



3.54 

 3.49 

 2.56 

 1.86 

 3.68 

 4.12 

 5.58 

 6.08 

 7.02 

 5.98 

 5.74 

 5.42 

 5.01 

 1.65 



14.62 

 7.60 

 10.08 

 10.90 

 13.12 

 16.71 

 17.05 

 19.25 

 22.03 

 20.41 

 16.36 

 16.77 

 11.43 

 9.69 



18.20 

 23.90 

 19.40 

 20.82 

 24.52 

 26.40 

 31.96 

 29.61 

 26.30 

 25.86 

 24.91 

 18.40 

 12.62 

 11.45 



27,99 

 24.48 

 24.30 

 19.41 

 19.01 

 18.90 

 19.23 

 17.64 

 16.38 

 20.53 

 15.93 

 13.51 

 22.61 

 21.43 



6.57 

 3.76 

 6.76 

 8.32 

 14.06 

 16.45 

 26.09 

 18.64 

 19.21 

 24.33 

 21.40 

 19.90 

 6.82 

 5.43 



17.44 



4.41 



14.72 



22.46 



20.10 



14.12 



13.96 

 11.52 

 23.48 

 24.81 

 34.21 

 36.21 

 41.19 

 38.40 

 38,99 

 39.45 

 38.50 

 30.61 

 27.92 

 20.57 



29.99 



19.30 

 20.62 

 24.61 

 33.18 

 43.80 

 45.01 

 41.86 

 44.71 

 45.87 

 43.72 

 39.74 

 38.20 

 34.33 

 25.06 



35.72 



TABLE II.— Series 1 West— Continued 



DISCUSSION OF Series 1 West (Corn, Oats, Wheat, Clover 

 AND Timothy). (Table II). 



The fresh nitrate content of the clover and timothy plot (about 

 9/10 timothy and 1/10 clover) was low throughout the season. It was 

 exceedingly low in May and June at which times the crop was drawing 

 heavily on the nitrates. The highest point of 6.08 parts per million 

 was reached July 15. The incubated samples showed fairly high through- 

 out the season. The addition of ammonium sulphate caused a great 



