SOILS' 



tM 





^0 uO 



Fig. 10. The effect of different soils upon plant growth. The 

 geranium in (i) blacl< loam, (2) clay, and (3) sand 



SAND 



A sandy soil is one which contains from 80 to 

 100 per cent, of pure quartz sand. A soil of 

 this type furnishes very little nourishment and 

 although it absorbs a large amount of water it 

 drys out very readily. Sand forms the best 

 medium in which to root cuttings, for cuttings 

 require little or no nourishment until roots are 

 formed. Again, fungus diseases do not de- 



33 



