PROPAGATION OF PLANTS 55 



Light frosts will not hurt it while it is on the stalks. Seed 

 corn should never freeze when moist. 



55. Importation of Low-Grade Seed. The United States 

 exports large quantities of clover seed, and imports smaller 

 quantities of low-grade seed. One reason for this is that 

 Canada and most of the European countries have laws 



FIG. 36. Method of drying seed corn. (After Holdeji.) 



for seed inspection. Screenings, very weedy seed, or seed 

 of low vitality cannot be sold, but can be exported from 

 those countries. We shall probably have laws for seed 

 inspection in this country in the future. In the mean- 

 time, every farmer will have to examine his own seed, 

 or send it to the State Experiment Station for examina- 

 tion. 



QUESTIONS 



1. Make a list of all the important farm plants of your region and 

 tell how each is propagated. 



2. Do you know of any fruit trees that bear two kinds of fruit? 



3. Give the life history of the apple tree from the time the seed is 

 planted until the tree is set in the orchard. 



