. Soil physics and management. i Rocty ^ounrain ForestI Southern forestI Cent ml ForestI Foci fie Coast forest ?llfe^^-^- ^5k ?^H tJcrthern Fonsst rt SJ Sub-Trcfucal cina Tropical forest Fig. 63.—Map of Unit-ed States, showing timber and prairie areas. Unshaded area,Prairie. Dark shade in Northeast and North, Central forests. Lighter shaded area in South-east, Southern forests. Very lightly shaded area. Rooky Mountain forests. Deep Coast forests. (Graves, U. S. D- A. Forest part of the soluble salts, so that aJkali is found only in small areas,and then consists principa
. Soil physics and management. i Rocty ^ounrain ForestI Southern forestI Cent ml ForestI Foci fie Coast forest ?llfe^^-^- ^5k ?^H tJcrthern Fonsst rt SJ Sub-Trcfucal cina Tropical forest Fig. 63.—Map of Unit-ed States, showing timber and prairie areas. Unshaded area,Prairie. Dark shade in Northeast and North, Central forests. Lighter shaded area in South-east, Southern forests. Very lightly shaded area. Rooky Mountain forests. Deep Coast forests. (Graves, U. S. D- A. Forest part of the soluble salts, so that aJkali is found only in small areas,and then consists principally of the more insoluble magnesium car-bonate. The second table on page 74 shows per cent of solu-ble salts in prairie soils, as compared with for timber soils. The prairie soils extend from Southern Texas northward intoCanada, widening to the east into west central Indiana. A belt whichis not shown in figure 63 extends across Mississippi and Alabamaand over into Texas. (h) Timber Soils.—The timber soils a
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