Thomas slag, 198. as fertilizer, 198. phosphoric acid in, 198.
Tillage and plant food, 67. and fertility, 150.
Transpiration, the fact, 110. amount of, 111.
Vegetables, roots, 13, 14, 15. soil for, 28.
Ventilation of soils, 68, 142. necessary for germination, 73. necessary for root growth, 21, 22, 23. necessary for fixation of nitrogen, 144.
Water, absorption of by soil, 40, 43, 46, 142. amount used by plants, 40. capillary, 49, 153. evaporation of, 54, 155. free, 48, 153. film, 50. ground, 48. importance of to plants, 39. percolation of, 41. relation of soils to, 39. standing, 48. work of in making soils, 33, 35.
Weeds, 54. how they injure crops, 54, 92. how to kill, 119. waste soil water, 54.
Work of sun in making soils, 32, 34. air in making soils, 36. animals in making soils, 37. moving ice in making soils, 35. moving water in making soils, 33, 35. plants in making soils, 36. rain in making soils, 33.
End of Project Gutenberg's The First Book of Farming, by Charles L. Goodrich