. The principles of agriculture, a text-book for schools and rural societies . Fig. 17. On well-drained soils, theroots strike F\k 18. When the drought comes,the plant does not suffer. THE MOISTURE IX THE SOIL 63 plants are enabled early in their growth to send their roots down,and when drought comes they are not seriously injured. illustrate this. 79a. The soil reservoir may be understood by likening it toa pan. A two-inch rainfall fills an inch-deep pan and runs itover ; but if the depth is increased to two inches, none of therain escapes. The hard-pan or water-table i
. The principles of agriculture, a text-book for schools and rural societies . Fig. 17. On well-drained soils, theroots strike F\k 18. When the drought comes,the plant does not suffer. THE MOISTURE IX THE SOIL 63 plants are enabled early in their growth to send their roots down,and when drought comes they are not seriously injured. illustrate this. 79a. The soil reservoir may be understood by likening it toa pan. A two-inch rainfall fills an inch-deep pan and runs itover ; but if the depth is increased to two inches, none of therain escapes. The hard-pan or water-table is the bottom of thesoil reservoir. If this bottom is within a few inches of the sur-face, the ordinary rainfalls fill the soil so full that it is muddy,and some of the water may be lost by surface washing. Deepplowing lowers the bottom of the reservoir, and the soil holdsmore water and yet remains drier. 81a. Tillage operations should vary according to the natureof the soil. Those soils which are loose and porous should becompacted after plowing, so that the capillary connection maybe restored between the surface and the subsoil. Th
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