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Biodigester effluent fertilizer quality (IRRI)
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==== 2.Phosphorous (Ph) ==== * makes up the structural framework of RNA and DNA, is used to transport cellular energy in biological organisms, and forms into phospholipids, which become the main structural components of cell membranes.<br> * '''Excess''' phosphorous can interfere with plant uptake of copper and zinc.<br> * '''Deficiency''' of phosphorous creates thick small cells, when looking at the new growth at the tips of the leaves this may look like fungus to some.<br> * Phosphorous is not found free in nature, but is excavated from minerals, rivers passing over rock with these minerals or rain coming in contact with these minerals helps erode the rock and release this phosphorous to be used by biological organisms. In 2008 based on the rates of excavation, scientists claimed that "Peak Phosphorous", where phosphorous reserves run out, could occur within 30 years due to the increasing use of crop based biofuels. This has been reflected in the skyrocketing cost, where the raw material of phosphate has increased by 700 percent to the price of $367 per tonne.<ref>Leo Lewis. Scientists warn of lack of vital phosphorus as biofuels raise demand. The Times. June 23, 2008.</ref> ===== Phosphate Phosphorous ===== Is concentrated in soils by manures from seed eating birds. ===== Potash Phosphorous ===== Is concentrated in soils by burnt and rotted plants or composts.
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