The full version is Biological Oxygen Demand. An indirect measure of the concentration of biodegradable material present in organic wastes. It generally reflects the amount of oxygen consumed in five days by biological processes, decomposition of organic waste.
21:59, 26 November 2012
Potash is the only source of potassium fertilizer; there ...
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Absorbed through the leaves of the plant, and ...
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A machine that sorts organic from inorganic matter for ...
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