CORN 85 



soil improvement applies two tons of ground limestone per 

 acre to his clover field in the fall, and a ton of fine ground 

 rock phosphate in the spring, before turning under the clover 

 for corn. The limestone cost $1.50 per ton and the rock 

 phosphate $7.50 per ton. His corn yield, as shown by check 

 plots, was five bushels more per acre the first season, and 

 twenty-five bushels more the fifth" season; the oats increased 

 twenty-five bushels, the wheat fourteen bushels, and the clover 

 one ton per acre. Estimating the expense of applying the 

 limestone and rock phosphate at 50 cents per ton, what did 

 he gain on the investment at the prevailing prices of grain 

 and hay? 



11. A farmer turned under a heavy clover crop in the 

 spring of 1913 and planted the field to corn. The corn ger- 

 minated and grew well for a few weeks, then dried up and 

 died. Explain. 



12. What is the purpose of the germinating test? 



13. If an ear of corn has 800 kernels and they should 

 all be planted and all grow, producing ears that weighed 

 12 ounces each, how much would that ear of corn be worth, 

 estimating its value from the yield at 50 cents a bushel? 



14. What is the meaning of the term "tillage"? Name 

 six values of tillage. 



15. What should be done at the first cultivation of corn? 

 Why is this cultivation so important? 



16. Speak of the value of shallow cultivation as com- 

 pared to deep cultivation of corn. 



17. What harm results from weeds in the corn? 



18. Why is it best to use home-grown seed? 



19. Name some characteristics of the parent plant that 

 are carried by the seed to the next generation. 



20. Why is it best to select seed corn in the field? When 

 should this be done? 



21. How is seed corn stored and cared for at your home? 



