no FARM AND SCHOOL PROBLEMS. 



2. Corn is planted on May 1, and there is no frost until Sept. 15, how 

 many days are there in which it can mature? 



3. A field of corn is planted on June 1 and there is a frost on Septem- 

 ber 20. What is the time for growth? 



4. A 120-day variety is planted on June 1. On what date will this corn 

 be safe from frost, if weather conditions are favorable for ripening? 



5. A 100-day variety of corn is planted on May 15. What will be the 

 date of the earliest possible frost without injury? 



FIG. 5. When all other conditions are favorable for a maximum crop, the 

 determining factor in the yield is the stand of corn. 



Relation of Stand to Yield. 



ON AN ACRE OF GROUND. 



Number of hills 3 feet 6 inches apart 3,555 



Number of stalks, 3 per hill 10,665 



Number of bushels with 1 pound ears on 100 per cent. Stand 152.4 



