SOILS 57 



Fine gravel -2 



Coarse sand 1-6 



Medium sand 1-1 



Fine sand 4.5 



Very fine sand 5.1 



Silt 68.2 



Clay 19.1 



This cannot be regarded as a first-class soil for vege- 

 table forcing, and yet it does not seem difficult to main- 

 tain good physical properties in the Lansdale silt loam. 



Norfolk series. The various types of sandy soils of the 

 Norfolk series are used extensively in vegetable forcing, 

 especially in the growing of frame crops. They are warm 

 and well drained, and respond readily to the use of 

 manures and fertilizers. The following table shows the 

 texture of a sample of Norfolk fine sandy loam : 



Gravel 1.34 



Coarse sand 21.14 



Medium sand 21.90 



Fine sand 15.84 



Very fine sand 5.66 



Silt 26.69 



Clay 7.46 



Irondequoit soils. The Dunkirk soils are found in the 

 Irondequoit greenhouse section. A mechanical analysis 

 of soil from Irondequoit is not available, but the Dunkirk 

 gravelly sandy loam analyzes as follows : 



Fine gravel 3.7 



Coarse sand 7.4 



Medium sand 6.4 



Fine sand 14.9 



Very fine sand 20.5 



Silt 37.0 



Clay 9.8 



Soil adaptation. The student has probably concluded 

 from the discussion in this chapter that a great variety of 

 soil types are adapted to vegetable forcing, or at least that 

 greenhouse vegetables are grown on soils that have a 



