368 THE SECONDARY GFxASSES 



30. How is a stand of Bermuda grass secured? 



31. With what plants is it mixed for pasture purposes? 



32. Describe Johnson grass. 



33. To what region is it best adapted? 



34. Is it persistent? 



35. What are its principal uses? 



36. How is a stand secured? 



37. State objections to Johnson grass. 



38. How may it be rotated with oats? 



39. Compare Johnson grass and Soudan grass. 



40. Name region where Soudan grass is best suited for cultivation. 



41. Give methods of culture. 



42. Why do we expect ita culture to increase? 



