PRACTICE XXXIV 



DETERMINATION OF THE EFFECT OF CULTIVATION AND MULCHES 

 UPON TEMPERATURE AND MOISTURE CONTENT 



A number of students may work at this experiment, each one 

 being assigned a definite problem. 



Select a level area of 4 or 5 square rods and remove any vege- 

 table matter, such as weeds, etc. Break up with plow or spade 

 all but 1 square rod. Place a mulch of straw or leaves several 

 inches deep upon half a square rod of both the plowed and the 

 unplowed area. Roll a portion of the plowed area. 



Determine temperature at 1, 2, and 4 mches in depth in each, 

 on days when the sun is shining. Read the thermometer every 

 2 hours. 



Determine moisture to a depth of 40 inches once each week 

 for at least 4 weeks. 



References. 



" Soils," Lyon and Fippin, p. 461. 



" The Soil," Hall, pp. 120-123. 



*' Physical Properties of Soil," Warington, pp. 156-161. 



'' The Soil," King, pp. 230-234. 



" Soils," Hilgard, pp. 304-305. 



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