PLANT-FOOD ELEMENTS REMOVED 69 



preceding paragraphs the importance of plant study is emphasized. 

 If anyone wishes to grow any kind of a crop most successfully 

 he should become familiar not only with the best cultural methods 

 in growing it, but, as far as possible, with all its habits and charac- 

 teristics as well. 



-1 



FIG. 27. The root-hair in the soil, hh, root-hair; e, portion of main root; 1, air space; 

 2, soil grain; 3, water film. (After Sachs.) 



Plant-food Elements Removed by Fruit Crops. It is of interest 

 to note the amounts of elements removed from the soil by some 

 of the common fruit crops. The following table has been prepared 

 from all available data : 



Plant-Food Elements Removed by Fruit Crops 

 (Pounds per acre) 



Strawberries need but little calcium, even in leaf and stem development. 



