. Soil physics and management. ble organic matter or nitrogen. Besides furnishing nitrogen, organic matter aids granulationand cements the finer particles together into compound granules,as discussed under organic matter. These soils need the addition oflarge quantities of organic matter to enable the surface to absorb 364 SOIL PHYSICS AND MANAGEMENT and retain more of the rainfall. Owing to its granulating effectorganic matter reduces the tendency to run together and keeps thesoil open, so there is less run-ofE and less erosion. Legumes must have a large place in the agriculture of theselands
. Soil physics and management. ble organic matter or nitrogen. Besides furnishing nitrogen, organic matter aids granulationand cements the finer particles together into compound granules,as discussed under organic matter. These soils need the addition oflarge quantities of organic matter to enable the surface to absorb 364 SOIL PHYSICS AND MANAGEMENT and retain more of the rainfall. Owing to its granulating effectorganic matter reduces the tendency to run together and keeps thesoil open, so there is less run-ofE and less erosion. Legumes must have a large place in the agriculture of theselands. It is advisable to feed most crops to stock on the farm. Allthe manure produced should be carefully preserved and returned tothe soil. All stalks, straw, stubble or other residues not fed shouldbe plowed under. Plowing under the entire crop of cowpeas, or atleast the straw, is a practice to be recommended. 5. Deep Contour Plowing.—A loose soil has more pore spacethan a compact one, consequently it will absorb more water. A.
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