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Biodigester effluent fertilizer quality (IRRI)
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== Soil Basics == * Soil is a complicated matrix of many minerals and nutrients not completely understood by science, the following is a break down of what is understood thus far. Soil is composed of a balance of at least 6 macro and 6 micro elements. The 6 macro elements are nitrogen(N), phosphorous(P), potassium (K), calcium, magnesium, and sulphur. The 6 micro elements are iron, maganese, boron, copper, zinc, and molybdenum.<ref>Kevin A. Handreck and Neil D. Black. Growing media for ornamental plants and turf. UNSW Press, 2002.</ref><ref>Dudley Harris. Hydroponics: the complete guide to gardening without soil. Struik, 1992</ref> This list is continually extended as new minerals and exiting minerals and micro nutrients roles within soil are better understood by science. * There are different N:P:K ratio's recommended specific for each crop and for different stages of growth including: seedlings stage, vegetative stage, and flowering and fruiting stages. So your soil and fertilizer mix should change depending on the plant and the stage its in.<ref>Harris, Dudley. Hydroponics: the complete guide to gardening without soil. Struik, 1992.</ref> * Seven additional nutrients beneficial to plants, but considered only psuedo-essential, include sodium, cobalt, vanadium, nickel, selenium, silicon, and aluminum.<ref>Kevin A. Handreck and Neil D. Black. Growing media for ornamental plants and turf. UNSW Press, 2002.</ref> The nutrients available from minerals in the soil differ in: how they're absorbed and utilized by the plant, their mobility in the plant, and the symptoms expressed in the plant from deficiency or excess amounts of the nutrient.<ref>Thomas Marler, Frank Cruz and James McConnell. Essential Plant Nutrients. College of Agriculture and Life Sciences, University of Guam</ref> * Soil structure is another important factor in soil quality and plant yield. The soil structure can be qualitatively analyzed by just visually and physically feeling the texture of the soil. Soil structure 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. Testing biol's ability to build up soil structure is another important quality assessment. '''Parameters List''' {| class="wikitable" | Macro Nutrients | Micro nutrients | |- | Nitrogen, N | Iron | |- | Phosphorous, Ph | Maganese | |- | Potassium, K | Boron | |- | Calcium, Ca | Copper | |- | Magnesium, Mg | Zinc | |- | Sulphur, S | Molybdenum | |}
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