. Soil physics and management. er becomesmixed with soil it undergoes a physical change produced by bacterialaction in which the plant tissues are destroyed, and it becomes ablack or dark brown homogeneous mass. At the same time a chem-ical ehange takes place. The process at first is quite rapid, but later10 146 sou. rinSlOS ANP MANAOVMKNT luHHMiios voiv slow, ami still ktor oouiJos* almost ontirely. The supplyof oxygon IS somowhat low in tho soil and tho oonditions aro notfavorable for annploto oxidation of tho vogotablo matter. The|>{\vtial oxidation pnnluees ovjianie matter of varied imp
. Soil physics and management. er becomesmixed with soil it undergoes a physical change produced by bacterialaction in which the plant tissues are destroyed, and it becomes ablack or dark brown homogeneous mass. At the same time a chem-ical ehange takes place. The process at first is quite rapid, but later10 146 sou. rinSlOS ANP MANAOVMKNT luHHMiios voiv slow, ami still ktor oouiJos* almost ontirely. The supplyof oxygon IS somowhat low in tho soil and tho oonditions aro notfavorable for annploto oxidation of tho vogotablo matter. The|>{\vtial oxidation pnnluees ovjianie matter of varied {his ehaniiv (he hydi\\5ivn and oxyjjen iHMitent of the veiivtahlematter hoivnnes less, while the ptvportion of earhon and nitroiivninert^ises. The orsiat\ie matter of the soil iu\der ditVerent ei>nditionsmay ;ntain from thiw to twenty times as nvueh nitrosivn as thewi^uiiial matoriaK This ohaii^syt^ may l>o carried so far that ultimatelyearlHUtiKed material may W pn^lvuvd that is similar to eoal or ehar-. Fivj- X ,.,0 ,... ?ouiut in #v\U*,vUv»lU>uu 5KK liutvjwi ^tf Soils.) -iHwiuu>MN v»t v-T^s-U iv>uuvi m «.\mI*s iwiP (Figs. Tl> aud tT). This dvKs? not uudergv further ehai\ humus aivumulaies moiv rapidly in very moist soils than iniHnnparatively dry oi\es. The following table frvmi Hilgiird shows*the changes in the for-mation of coi\l, pn>l>{\bly somewhat similar to those changvs ofonjjvnio matter in soils: V (\k«I * (Jtfo».sf«re and Ash Omittiedns) l>?*t Cy»sas lose Uunuu Blown 1 I Mtd httiHifi J scad I 8ar> faw !^Ihnin* BUirl; 40 brown :(UintSO I txvJ ? bill*- u„,>.„ittclieg kBov«j)|nuiwvi***iV™^ ultra avrlxMx * -U).4-0 c^.^50 Uvvit\>snn\ ) lUT ,5 5,40 5-1X1 ; 2,60 0\Ysivn j S5, SlVW 26,S0 \ .> ^^^ Nit^^4iXM\, ,S-1S,7 .v^l 2a0 .iXl; I ORGANI(J CONSTITUENTS Ol SOILS 147 Wliil(; this iiihit dotis ii(;t represent
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherphila, bookyear1917
