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  2. Boron deficiency (plant disorder) - Wikipedia

    en.wikipedia.org/wiki/Boron_deficiency_(plant...

    Boron is an essential micronutrient which means it is essential for plant growth and development, but is required in very small quantities. Although Boron requirements vary among crops, the optimum boron content of the leaves for most crops is 20-100 ppm. [8] Excess boron can result in boron toxicity and the toxicity level varies between plants ...

  3. Vitamin B12 deficiency - Wikipedia

    en.wikipedia.org/wiki/Vitamin_B12_deficiency

    Vitamin B 12 deficiency, also known as cobalamin deficiency, is the medical condition in which the blood and tissue have a lower than normal level of vitamin B 12. [5] Symptoms can vary from none to severe. [1] Mild deficiency may have few or absent symptoms. [1]

  4. Boron - Wikipedia

    en.wikipedia.org/wiki/Boron

    Levels as low as 0.8 ppm produce these same symptoms in plants that are particularly sensitive to boron in the soil. Nearly all plants, even those somewhat tolerant of soil boron, will show at least some symptoms of boron toxicity when soil boron content is greater than 1.8 ppm.

  5. Boron deficiency - Wikipedia

    en.wikipedia.org/wiki/Boron_deficiency

    Boron deficiency may refer to: Boron deficiency (plant disorder), a nutritional disorder in plants; Boron deficiency (medicine), a nutritional disorder in animals

  6. Boron group - Wikipedia

    en.wikipedia.org/wiki/Boron_group

    The symptoms of boron toxicity are numerous in plants, complicating research: they include reduced cell division, decreased shoot and root growth, decreased production of leaf chlorophyll, inhibition of photosynthesis, lowering of stomata conductance, [58] reduced proton extrusion from roots, [59] and deposition of lignin and suberin.

  7. Pernicious anemia - Wikipedia

    en.wikipedia.org/wiki/Pernicious_anemia

    Neuropsychiatric symptoms can precede hematological signs and are often the presenting manifestation of the disease. [55] Vitamin B 12 serum levels are used to detect its deficiency, but do not distinguish its causes. Vitamin B 12 levels can be falsely high or low and data for sensitivity and specificity vary widely.

  8. Zinc deficiency (plant disorder) - Wikipedia

    en.wikipedia.org/wiki/Zinc_deficiency_(plant...

    Maize plants with severe zinc deficiency in the foreground, with healthier plants (planted at the same time) in the background. Zinc deficiency is common in many different types of soil; some soils (sandy soils, histosols and soils developed from highly weathered parent material) have low total zinc concentrations, and others have low plant-available zinc due to strong zinc sorption ...

  9. Vitamin deficiency - Wikipedia

    en.wikipedia.org/wiki/Vitamin_deficiency

    Niacin deficiency is a consequence of a diet low in both niacin and the amino acid tryptophan, a precursor for the vitamin. Low plasma tryptophan is a non-specific indicator, meaning it can have other causes. The signs and symptoms of niacin deficiency start to revert within days of oral supplementation with large amounts of the vitamin. [23] [24]

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