A STUDY OF "WARM" AND "COLD" SOILS 37 



Discussion: Tile-drained soils and sandy soils with 

 good natural drainage warm up more rapidly in the spring 

 than poorly drained soils. Why? Sandy land is com- 

 monly spoken of as a warm soil, while clay is regarded as 

 a cold soil. Well-drained sandy soil is used for the growing 

 of early truck crops. Why? 



Plowing or stirring the soil in the early spring hastens 

 evaporation and as soon as the surface becomes dry the 

 soil begins to warm up rapidly. 



