342 CARE OF GRASS 



3. Lime must first be applied to acid soils before fertilizers will 

 give results. This is important throughout much of Ohio, Penn- 

 sylvania, and the northeastern States. 



Weeds in Meadows. Certain weeds, such as ox-eye daisy, flea- 

 bane, and wild carrot, are serious pests in timothy meadows. In 

 general, however, none of these weeds can compete with grass if con- 

 ditions are made very favorable for the grass. For example, at 

 Cornell Experiment Station, plats of grass three years old that 

 have received fertilizer or manure are free from weeds, while similar 

 plats unfertilized are usually very weedy. The secret of keeping 

 weeds out is to make conditions right for grass. 



FIG. 154. A productive hay field, the kind that usually responds well to fertilizer. (Photo 



by Verne Morton.) 



QUESTIONS 



1. To what fertilizer does grass most readily respond? 



2. What effect has nitrogen on vegetation ? 



3. Is phosphate important? 



4. Of what value is potash? 



5. What form should fertilizer be in for meadows and why? 



6. What is a soluble fertilizer? 



7. Name some common fertilizers. 



8. Give the approximate amount of fertilizer to apply. 



9. When should it be applied? 



10. What manure is best for grass land? 



11. Compare application of manure or fertilizer to grass land and to culti- 



vated crops. 



12. Do all meadows respond to fertilizer? 



13. Name conditions of meadow before good results are to be expected. 



14. Why does fertilizing or manuring keep down weeds? 



