X. CONTENTS 



— 34. The Essential Elements. — 35. The Essential Ele- 

 ments and Saskatchewan Soils. — 36. Average Saskatche- 

 wan Soil vs. Other Soils. — 37. Organic Matter and Soil 

 Fertility. — 38. Functions of Organic Matter. — 39. Losses 

 of Organic Matter in the Soil. — 40. The Rothamsted Ex- 

 periments on Soil-Fertility. — 41. Illinois Experiment. — 

 42. Soil Acidity and Liming the Land. — 43. Crop Rota- 

 tions and Soil Fertility. (The Soil a Living Mass). — 44. ^ 

 Importance of Micro-organisms in the Soil. — 45. The 

 Soil a Living Mass. — 46. Functions of the Bacteria in 

 the Soil — 47. Preparation of Available Plant-food. — 48. 

 The Nitrogen Cycle.— 49. The Mineral Plant Food Ele- 

 , ments. — 50. Parasitism (disease). — 51. Nitrogen Fixa- 

 tion by Leguminous Plants. (The Factors of Soil Fertil- 

 ity). — 52. The Measure of Fertility. 



CHAPTER IV. 



The Moisture Problem 78 



53. Storing Moisture in the Soil. — 54. Conserving Mois- 

 ture in the Soil. — 55. Keeping Soil Moisture Available. — 

 56. The Efficient Utilization of -Soil Moisture.— 57. Soil 

 Fertility and Soil Moisture. 



CHAPTER V. 



Dry Farm Crops and Cropping Practices 89 



58. Drought Resisitant Crops. — 59. Durum Wheat.^ — 60. 

 Winter Rye.— 61, Spring Rye.— 62. Flax.— 63. Two- 

 Row Barley. — 64. Emmer. — 65. Early Oats. — 66. Grasses 

 . for Hay and Pasture.— 67. Alfalfa.— 68. Millet.— 69. 

 Sweet Clover. — 70. Rape. — 71. Corn. — 72. Sunflowers.— 

 73. Suitable Crop Management Practices. — 74. The Time 

 to Sow. — 75. The Amount to Sow. — 76. Sow into the 

 Moisture. — 77. Non-Shattering Varieties. — 78. Short vs. 

 Long Straw. 



CHAPTER VI. 



The Principles of Tillage - 104 



79. The Chief Functions of Tillage. — 80. Objections to 

 Excessive Tillage. — 81. Implements of Tillage. — 82. The 

 Function of the Plow.— 83. The Disk Plow.— 84. Coulters. 



(Soil Looseners). — 85. Cultivators 86. Disk Harrows. — • 



87. Drag or Smoothing Harrows. (Soil Firmers). — 88. 

 Purpose of Soil Firmers. — 89. Drills as Tillage Machines. 

 —90. Press Drills. 



