THE EARLY DEVELOPMENT OF THE WHEAT PLANT 67 



Directions. Dig up a number of small wheat plants for 

 this study. Be careful not to break the roots in removing 

 the plants from the 

 soil. Remove the 

 dirt which clings to 

 the roots, by wash- 

 ing. Make a study 

 of plants one week 

 old, two weeks old, 

 three weeks old, and 

 four weeks old, 

 seeded one inch 

 deep. Also make a 

 study of plants two 

 weeks old and four 

 weeks old, seeded 

 three inches deep. 

 (In determining age 

 of plant count time 

 from date of seed- 

 ing.) 



Make drawings of 

 the plants at the 

 different stages of 



B 



FIG. 5. Young wheat plants. A, two daya 

 after planting ; B, five days after planting ; 

 C, three plants the same age planted at dif- 

 ferent depths. 



growth and at the 



different depths of 



seeding indicated. 



Show in the drawings the three temporary roots which 



develop first, and in other drawings show the permanent 



roots which develop somewhat later and are sent out in 



