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Biodigester effluent fertilizer quality (IRRI)
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== Soil Structure == Soil structure (whether porous or compacted) effects the soil's permeability, susceptibility to erosion, root growth, and the ability of soil to retain nutrients. While synthetic fertilizers fail to renew and rebuild soil structure, composted manures and foods scraps have the ability to add to and renew the soil structure. The structure depends on the soil composition of sand, silt, clay, and organic matter in the soil as well as the presence of any flocculating or ionic substances.<ref>Mollison, Bill. Permaculture: A Designer's Manual. Tagari, 1988. Pg 576.</ref> The soil structure can be qualitatively analyzed by just visually and physically feeling the texture of the soil. Another test for soil structure can be done by placing a soil sample in a tall mason jar filled with water and after shaking vigorously allow the particles to settle out over a day. The different components will stratify, with gravel ans sand falling to the bottom, silt above that, clay above that, organic particles above that, and just water at the top clear area. Testing biol's ability to build up soil structure is an important quality assessment.
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