454 



THE PRINCIPLES OF SOIL MANAGEMENT 



6 P.M. 



6 A.M. 



NOON 



Fig. 122. Curves showing the daily range of soil temperature near the 

 surface on soils of different texture in Pennsylvania and North Carolina. 

 Table LXVIII. 



The following table and curves show the average 

 mean monthly range in temperature of the air and soil 

 at different depths at Lincoln, Nebraska for a period of 

 twelve years. 



Table LXIX. Temperature in Degrees Fahrenheit 



Position 



1. Air 



2. Soil, 1 in.. 



3. Soil, 6 in.. 



4. Soil, 12 in 



5. Soil, 36 in 



03 

 3 



a 



03 



25.2 

 27.3 

 28.6 

 31.2 

 38.5 



c3 

 3 



u 



fa 



24.2 



27.7 

 27.8 

 30.2 

 35.5 



s 



35.8 

 38.2 

 36.6 

 35.4 

 35.8 



c 



< 



52.1 

 57.5 

 53.3 

 49.3 

 43.8 



03 



61.9 

 68.7 

 65.1 

 60.7 

 53.5 



a 



3 



71.0 

 78.1 

 75.7 

 69.9 

 61.3 



3 



76.0 

 85.1 

 81.6 

 75.7 

 67.4 



M 

 P 

 < 





74.5 67.6 

 82.9 73.8 

 80.172.0 

 75.769.2 



69.8 67.6 



I 



1 



3 



55.5 

 56.7 



57.8 

 57.8 

 61.3 



o 



38.7 

 38.7 

 41.5 

 44.7 

 52.2 



a 



0) 



o 



Q 



28.3 

 31.6 

 32.0 

 35.2 

 43.3 



There is a large daily as well as annual range in the 

 temperature of the soil. At the surface, the range is 



