TILLAGE 237 



15. Give facts regarding fineness of mulches. 



10. What conclusion may be drawn from King's work as given in table on 

 page 23o? 



17. What are some disadvantages of a three-inch mulch? 



18. How deep should the mulch be? 



19. How does a shower destroy a mulch? 



20. What part does texture play in the ease with which a mulch may be 



maintained? 



21. How often should cultivation be done to maintain a mulch? 



REFERENCES 



'Buckingham, E., Bulletin 38, Bureau of Soils, U. S. D. A., Studies in the 



Movement of Soil Moisture, 1!K)7, p. 17. 

 King, F. 1L, Physics of Agriculture, 11)07, p. 180. 



