viii CONTENTS 



EXERCISE PAGE 



A 24. To Study the Capillary Movement of Soil Moisture 51 



A 25. To Show the Effect of Plowing Undrr Coarse Material 



such as Manure, Green Cover Crops or Clods 53 



A 26. To Show the Effect of a Mulch in Preventing the Loss of 



Moisture 54 



A 27. To Study the Water Loss from Cultivated, LTncultivated 



and Mulched Soil Surfaces 5G 



A 28. To Show the Effect of Drainage upon Soil Temperature. ... 59 



A 29. To Show the Influence of Color upon Soil 'I'emperature . ... 61 



A 30. To Show the Effect of Lime upon the Soil 63 



A 31. To Study the Need of the Soil for Lime 66 



A 32. To Study the Adaptability of Soils to Croi)s 69 



A 33. To Study the Plow 71 



A 34. To Study Plant Roots and Their Relation to Soil Manage- 

 ment 73 



A 35. To Study the Roots of Legumes 75 



