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Biodigester effluent fertilizer quality (IRRI)
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==== 3.Potassium (K) ==== * helps activate 60 different enzymes involved in plant growth, it helps stabilize the pH between 7 & 8, regulates the opening and closing of stomats, thus also regulating the exchange of CO2, water vapor, and oxygen essential for photosynthesis, water and nutrient transport, and plant cooling. It also helps regulate the transport of sugars, the synthesis of starch, and the synthesis of proteins.<ref>International Plant Nutrition Institute. Functions of Potassium in Plants. Better Crops with Plant Food. [https://web.archive.org/web/20180831063733/https://www.ipni.net/ppiweb/bcrops.nsf/$webindex/84CBB51751971AB3852568F000673A10/$file/98-3p04.pdf http://web.archive.org/web/20180831063733/https://www.ipni.net/ppiweb/bcrops.nsf/$webindex/84CBB51751971AB3852568F000673A10/$file/98-3p04.pdf]</ref> * '''Excess''' can induce a magnesium deficiency and micro nutrient deficiencies in iron and zinc.<ref>Thomas Marler, Frank Cruz and James McConnell. Essential Plant Nutrients. College of Agriculture and Life Sciences, University of Guam</ref><ref>Joe Traynor. Ideas in Soil and Plant Nutrition. 1980. Kovak Books, Bakersfield, CA.</ref><br> * '''Deficiencies''' may result in leaves turning purple, stunted plant growth, and delay in plant development.<ref>Thomas Marler, Frank Cruz and James McConnell. Essential Plant Nutrients. College of Agriculture and Life Sciences, University of Guam</ref><br>
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