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VERTICAL FAR'MIN'G 69 



QUESTIONS 



1. What is your investment in tools per acre of land tilled? 



2. What is your total cost of preparing, seeding, cultivating, 



and harvesting one acre of money crop? 



3. What improvements over the practices of your father have 



you made in the use of field machinery and supplies? 



4. How deep do you actually plow? (Measure the depth at 



the unbroken side of the furrow.) 



5. Did you ever follow up the full development of the roots of 



a tree or a field plant ? What did you find ? 



6. Have you any actual knowledge of the character of your 



subsoil ? 



