THE FIGHT AGAINST WEEDS 89 



keep an acre free from weeds, what would be the gain 

 per acre? 



5. What would be the gain on a 24-acre field? 



6. Is the quality of the corn from a weedy field 

 ever so good as that from a clean field? Why? 



7. Suppose clean oats produce 65 bu. per acre and 

 weedy oats produce only 48 bu. per acre, with oats at 

 30 cents per bushel what is the loss from weeds ? What 

 is the loss on a i6-acre field? 



8. Are oats grown in a weedy field as good in 

 quality as clean grown oats ? Explain. 



9. Give several reasons for weedy oats. Can weeds 

 in oats be easily destroyed after the oats are sown ? 



10. Will crop rotation prevent weeds in oats? 

 What is a good crop for oats to follow ? Why ? 



n. A yield of 300 bu. of potatoes per acre would 

 be an excellent crop. The land would need to be well 

 cultivated and kept free from weeds to produce this. 

 Suppose but 140 bu. are grown instead, what is the 

 loss from lack of labor? At 25 cents per bushel what 

 is the money value of this loss? 



12. For how many days' labor at $1.25 per day will 

 an amount of money equal to this loss pay? 



13. Suppose only twelve days' extra labor were 

 required to give the larger yield, how much would 

 be gained? 



14. If the farmer did these extra twelve days' 

 work himself, what would he get per day for his time? 



15. Pupils will furnish data from their own experi- 

 ence and Irom home for similar problems. 



