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In,fact,,the,average,humus,particle,is,one,thousand,years,old.,(See,,Illustration,,6.),,One,,important,,type,,of,,soil,,aggregate,,is,,water-stable,,aggregates.,,Each,,of,,these,,components,,contributes,,to,,the,,vital,,functions,,of,,soil.,,(See,,,Illustration,,,3.),,,Illustration,,,3:,,,Clay,,,Particles,,,Holding,,,Nutrients.,,,W.,,Much,,to,,the,,surprise,,of,,anyone,,who,,considers,,soil,,to,,be,,dead,,dirt,,,living,,organisms,,compose,,about,,15,,percent,,of,,total,,soil,,organic,,matter,,,weighing,,between,,2,000,,and,,30,000,,pounds,,per,,acre,,(Gugino,,2007;,,Brady,,1996).,,Aggregates,,,are,,,formed,,,in,,,part,,,by,,,exudates,,,from,,,bacteria,,,,entanglement,,,of,,,soil,,,particles,,,in,,,fungal,,,hyphae,,,,and,,,digestion,,,by,,,earthworms.,,,Reviewed,,by,,Doug,,Beegle,,,Distinguished,,Professor,,of,,Agronomy,,,Penn,,State,,Department,,Crop,,and,,Soil,,Sciences,,,and,,Charlie,,White,,,Penn,,State,,Extension.,,They,can,be,difficult,to,work.,Generally,they,are,high,in,organic,matter,and,have,large,soil,aggregates.,

Then,,,you,,,wait,,,two,,,days,,,just,,,until,,,the,,,point,,,that,,,the,,,soil,,,has,,,stopped,,,draining.,,,Clays,,,are,,,made,,,up,,,of,,,very,,,small,,,particles.,,,Tianna,,,DuPont,,,,former,,,sustainable,,,agriculture,,,educator,,,,Penn,,,State,,,Extension.,,,Water-Holding,Capacity,High-quality,soils,have,a,high,available,water-holding,capacity.,Sandy,soils,often,cannot,store,as,much,water,for,crops,between,rains.,Tiny,,clay,,particles,,have,,more,,surface,,area,,than,,larger,,particles,,of,,sand,,or,,silt,,(FAO,,,2007).,,Fertile,,soils,,are,,able,,to,,provide,,the,,nutrients,,required,,for,,plant,,growth.,,

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