7- Why does deep fall-plowing make soils "warm" or 

 " early " in spring? 



8. What proportion of farmers in your vicinity practice 

 iinder-drainage ? 



9. How many of the farms need under-drainage? 



10. How deej) and liow far ai)art would you lay under-drains ? 



1 1 . Do the farmers of your neighborhood have enough differ- 

 ent kinds of tools to enable them to till their land cheaply and 

 efficientlv ? 



