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Aeration, moisture infiltration and percolation, and nutrient availability and retention are reasons why soils need organic matter. Dark-colored, fresh-smelling, nutrient-rich organic matter comes from the natural breakdown of carbon- and nitrogen-rich dead, decomposing, dying animal and plant matter in soils. Organic matter facilitates the formation of air and water pore spaces, the defenses against over-draining and water-logging, and the dispersion of macro- and micro-nutrients for soil food web members such as plant roots.

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Q: Why does soil need organic matter?
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Dahlia like well drained soil with organic matter.


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Inaccuracy in the particle size and therefore in soil characterization, classification and texture is the reason for why organic matter has to be removed in soil hydrometer tests. Samples may contain carbonates, organic matter, oxides and soluble salts. All four of the above-mentioned soil constituents need to be removed since they bind soil particles into bigger sizes.


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