page_title: Potassium deficiency (plants)
hierarchical_section_title: Potassium deficiency (plants)
caption_attribution_description: English: A maize plant showing symptoms of severe potassium deficiency; growing on a highly-weathered kaolinitic soil in on Cedara research farm, KwaZulu-Natal. Such severe symptoms (and very low maize yields) are often associated with exchangeable-K concentrations of less than 50 mg/kg soil. Symptoms are necrosis (tissue death) of tips and margins of the older leaves, along with some chlorosis (yellowing). Reference: Farina, M.P.W., Channon, P., Thibaud, G.R. and Phipson, J.D., 1992. Soil and plant potassium optima for maize on a kaolinitic clay soil. South African Journal of Plant and Soil, 9(4), pp.193-200. File Name&#160;: DSCN0834.JPG File Size&#160;: 692.4KB (709004 Bytes) Date Taken&#160;: 2003/01/13 08:04:08 Image Size&#160;: 2048 x 1536 pixels Resolution&#160;: 300 x 300 dpi Bit Depth&#160;: 8 bits/channel Protection Attribute&#160;: Off Hide Attribute&#160;: Off Camera ID&#160;: N/A Camera&#160;: E885 Quality Mode&#160;: NORMAL Metering Mode&#160;: Matrix Exposure Mode&#160;: Programmed Auto Speed Light&#160;: No Focal Length&#160;: 15.3 mm Shutter Speed&#160;: 1/470.3 second Aperture&#160;: F3.8 Exposure Compensation&#160;: 0 EV White Balance&#160;: Auto Lens&#160;: Built-in Flash Sync Mode&#160;: Normal Exposure Difference&#160;: N/A Flexible Program&#160;: N/A Sensitivity&#160;: Auto Sharpening&#160;: Auto Image Type&#160;: Color Color Mode&#160;: N/A Hue Adjustment&#160;: N/A Saturation Control&#160;: Normal Tone Compensation&#160;: Auto Latitude(GPS)&#160;: N/A Longitude(GPS)&#160;: N/A Altitude(GPS)&#160;: N/A
context_page_description: Potassium deficiency, also known as potash deficiency, is a plant disorder that is most common on light, sandy soils, because potassium ions are highly soluble and will easily leach from soils without colloids. Potassium deficiency is also common in chalky or peaty soils with a low clay content. It is also found on heavy clays with a poor structure.
context_section_description: Potassium deficiency, also known as potash deficiency, is a plant disorder that is most common on light, sandy soils, because potassium ions (K⁺) are highly soluble and will easily leach from soils without colloids. Potassium deficiency is also common in chalky or peaty soils with a low clay content. It is also found on heavy clays with a poor structure.
caption: A potassium-deficient maize plant. Necrosis of the leaf margin is most severe on the oldest leaves.
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