CONTENTS Xlli 



CHAPTER 15 



PAGE 



THE FORAGE PLANTS OF THE FAMILY LEGUMINOS.E 187 



Alfalfa; Red clover; Alsike clover; Crimson clover; White clover; Sweet 

 clover; Field pea; Cowpea; Soy; Peanut; Miscellaneous leguminous forage 

 plants; Miscellaneous forage plants; Bibliography; Laboratory work. 



CHAPTER 1 6 



LEGUMINOUS ROOT TUBERCLES AND THE ACCUMULATION OF NITROGEN; NITROGEN- 

 CONSUMING PLANTS . . . 218 



Loss of soil nitrogen; Nitrification; Nitrogen-storing plants; Types of legu- 

 minous nodules; Leaf nodules of Rubiaceae; Use of green manures; Encourage- 

 ment of leguminous crops; Microbe-seeding; Nitrogen-consuming plants (Root 

 crops, bulb crops, stem crops, leaf crops, flower crops, fruit crops, cereal crops, 

 seed crops); Bibliography; Laboratory work. 



CHAPTER 17 



WEEDS AND WEED CONTROL 241 



Definitions; Injurious nature of weeds; Introduction and distribution; Means 

 of distribution; Lines of travel; Special weed examples; Classification of weeds; 

 Destruction; Weed legislation; Bibliography; Laboratory work. 



CHAPTER 1 8 



AGRICULTURAL SEEDS, SEED SELECTION AND TESTING 259 



General Considerations; History; Apparatus for seed testing; Purity tests; 

 Germination tests; Practical seed testing; Means of detecting source of seeds; 

 Number of seeds; Bibliography; Laboratory work. 



GLOSSARY AND INDEX \ - - 273 



