66 GROWING CEOPS 



4. The children of the public schools can do all the 

 testing for their own district. Find out how many acres 

 of corn were planted in your district last year and esti- 

 mate, at the present price of corn, how much the school 

 could have earned for your neighborhood by testing its 

 seed corn. 



5. If a clean field produces 60 bu. of corn per acre and 

 a weedy one only 40 bu., what is the loss per acre caused by 

 weeds, with corn at 35$ a bushel ? Suppose 4 days' work 

 would keep an acre clean, how much would 1 day's work 

 profit the farmer ? 



6. A field of oats clear of weeds produces 50 bu. per 

 acre. If a weedy field produces only 37 bu., what is the 

 loss on 1 A. of weedy oats when oats sell at 25$ a bushel ? 



7 . In a demonstration a field plowed 4 in. deep produced 

 30 bu. of corn per acre, and a field plowed 6 in. deep pro- 

 duced 42 bu. of corn per acre. At the present price of corn, 

 determine the value of the deep plowing on one acre ; on a 

 40-acre field of corn. 



8. If a man charges $2.50 a day for plowing, what is the 

 difference in the cost of plowing the field in the above prob- 

 lem if in one day the man can plow 2^ A., 4 in. deep, or 

 11 A., 6 in. deep. At the present price of corn, does deep 

 plowing pay ? 



9. Seventy-five bushels of corn per acre would be a good 

 yield when the land is plowed deep and carefully culti- 

 vated ; and 30 bu. a fair yield when the land is plowed 

 shallow and only reasonably well cultivated. If a man is 

 able to cultivate 20 A. thoroughly or 35 A. carelessly, by 

 which method of cultivation would he realize more when 

 corn is worth 40$ a bushel ? What important consideration 

 has been left out of this problem ? 



