QUESTIONS 157 



5. Examining Seed Samples. — Cct samples of clover seeds, and other 

 small seeds. Examine eacli sample for (a) weed seeds; (b) dead seeds; 

 (c) foreign inert matter or grit; {d) sound seeds true to the variety; (e) 

 others of useful varieties. Count the number in each of these five classes 

 and then determine the percentage of each. 



6. Numbers of Weeds. — Search the fields, fence rows, road sides 

 and other places for dense growths of weeds. Bend a wire into a circle 

 or use a barrel hoop and throw it over the densest cluster you can 

 find, count the number of weeds in the circle. Determine the number in 

 a square foot and calculate the number per acre (43,560 sq. ft.). Do 

 likewise for several diHerent species of weeds. 



7. Study the smothering influence of weeds found growing in rows 

 of young garden crops, corn, etc. 



QUESTIONS 



1. What is a weed? 



2. In what ways are weeds injurious? 



3. How are weeds introduced into new localities? 



4. Have you seen instances of these? 



5. How can a farmer prevent the introduction of weeds? 



6. How may perennial weeds be most easily eradicated? 



7. How may annual weeds be eradicated? 



