238 ELEMENTS OF AGRICULTURE 



18. Is yours an important corn-growing region? Why? 



19. What are the best post trees of the region? Are trees grown 

 for lumber? If so, which are best? 



20. What effect does girdling a tree have? 

 21 What is a knot? 



22. What is quarter-sawn lumber? In what other ways is lumber 

 sawn? 



23. How can the age of a tree be determined? 



24. Will mulching the soil or tilling it affect the time of blossom- 

 ing of a tree? 



25. How many bushels of ear corn will a wagon box 2 feet 

 deep, 3 foot wide and 1 1 feet 9 inches long hold? How many bushels of 

 shelled corn will it hold? How much will the load weigh in each case? 

 (See Appendix, Table 18.) 



26. A man has plowed a strip GJ rods wide with furrows 30 rods 

 long. How many acres has he plowed ? How many turns has he 

 made if the plow cuts 14 inches ? 



27. How many tons of hay will there probably be in a mow that 

 is 15 x 30 feet and that contains 10 feet of hay that has settled all 

 winter? (See Appendix, Table 18.) 



LABORATORY EXERCISES 



63. Score Card for Dent Corn. 



Materials. Several samples of corn, five or ten ears in a sample. 



Use the score card on page 278 of "Cereals in America," or the 

 following, deducting for imperfections in any of the points. 



Points 



Maturity and market condition 20 



Seed condition 20 



Shape of kernels 20 



Uniformity 15 



Weight of ear 10 



Color of grain and cob 5 



Length of ear and proportion 5 



Butts and tips 5 



100 



64. Depth to Plant Corn. 



Materials. Corn and box of soil, or a garden. 



Plant ten kernels of corn at each of the following depths: one, 

 two, four and six inches. How many days does it take for the corn 

 to come up in each case? Which plants are most vigorous? After it 



