| Much of the undecomposed organic matter in sediment and sedimentary rocks is humus, plant matter that accumulates in soil. |
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| Mulching is the addition of undecomposed plant materials such as straw, hay, or processors' refuse to the soil under the plants. |
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| The total organic matter in soil, except for materials identifiable as undecomposed or partially decomposed biomass, is called humus. |
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| They are badly drained and strongly acid and have a variable, undecomposed organic layer over mineral horizons. |
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| Any garbage or other refuse, including organic waste, remains undecomposed for decades and can diminish a later visitor's park experience. |
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| Ecosystems and soils of the boreal region store a significant amount of Earth's carbon in the form of dead but undecomposed or partially decomposed organic matter. |
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| The quality of added OC may influence not only the amount of undecomposed OC but also the fluxes of decomposing OC between soil fractions. |
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| Thatch, as you know, is a layer of undecomposed grass on the soil surface. |
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| Stagnation of deep sea currents in middle Cretaceous times caused anoxic conditions in the sea water leaving the deposited organic matter undecomposed. |
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| Wetlands have potential for significant carbon sequestration as undecomposed organic material, but they are small and vulnerable to carbon loss if the moisture regime changes. |
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