254 



INDEX 



Osmose, 18. 

 Ovary of flower, 130. 

 Ovules, 130. 

 Oxygen in plants, 66. 



Paris green to destroy 



chewing insects, 117. 

 Parsley family, 86. 

 Parsnip root, depth of 



growth, 13. 

 Parsnips, 4. 

 Pasture, soils for, 30. 

 Pea family, 86. 



soils, 28. 

 Peach borer, 127. 



flower, 130. 

 Peanuts, 5. 

 Peat, 30. 



Peppers, soil for, 28. 

 Percolation of water, 41. 

 Petals, 129. 

 Petunia, 129. 

 Pigweeds, 5, 6. 

 Pistil, 130. 



function of, 131. 

 Phosphate, odorless, 198. 



rock, 195. 



slag, 195, 198. 

 Phosphoric acid, 195. 



available, 195, 196. 



in fertilizers, 195. 



in soil, 148. 



insoluble, 195, 196. 



reverted, 196. 



soluble, 196. 



sources of, 171. 

 Phosphorus in plants, 66, 67. 



in soils, 68. 



Plank harrow, 102, 105. 

 Plant, analysis of, 63. 



most important part of to 

 plant itself, 7. 



most important part of to 



plant grower, 7. 

 Plant diseases, 118. 

 Plant food, 63. 



and the farmer, 5. 



Plant food, in soil, 63. 



in fertilizers, 68, 192, 205. 



what it is, 63, 69. 

 Planting, 



corn, 84. 



grass seed, 84. 



grain seed, 84. 



method of, 83. 



seeds, 81. 



vegetable seeds, 84. 

 Plants, 5. 



and the farmer, 5. 



conditions for growth, 6. 



composition of food of, 63. 



for study, 6. 



living, growing things, 6. 



parts of, 6. 



resemble one another, 6. 



why raised, 6. 



work of in making soils, 



36. 

 Plow beam, 93. 



coulter, 94. 



characteristics of, 95. 



clevis, 93. 



cutting roots, 15. 



draft ring, 93. 



handles, 93. 



jointer, 95. 



landside, 94. 



mouldboard, 94. 



parts of, 92. 



shackle, 93. 



share, 93. 



standard, 92. 



truck, 95. 

 Plowing, 90. 



depth of, 96. 



effect on soil water, 156. 



favors root growth, 14. 



in fall, 99, 157. 



in spring, 98, 157. 



importance of deep, 15, 



17- 



objects of, 91, 92. 

 to save water, 92. 

 time for, 98. 



