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  • plss describe mobilisation of elements with respect to plants



  • @shivam-madhav-gawate
    Nutrients important for plant growth vary in their ability to move within the plant. Knowing how they move can be helpful when diagnosing deficiency problem
    Nutrients important for plant growth vary in their ability to move within the plant. Knowing how they move can be helpful when diagnosing deficiency problems.

    Seventeen elements have been identified as vital to plant growth. Three elements, carbon, hydrogen and oxygen, are non-minerals and the other 14 (Table 1) are minerals. Carbon and oxygen enter plants through leaves as carbon dioxide. Oxygen also enters plants with hydrogen through roots as water. The other 14 must be dissolved in soil water and enter the plant as roots take up water. Mineral elements can further be divided into primary or secondary macronutrients and micronutrients. Macronutrients are those needed in relatively large amounts while micronutrients, as their name implies, are needed in small amounts. However, a deficiency in any vital element can seriously inhibit plant development
    The 14 elements essential for plant growth and their mobility and role within the plant.
    Macronutrient
    Mobile in plant
    Role in plant
    Primary elements
    Nitrogen is Mobile.It helps in Formation of amino acids, vitamins and proteins; cell division
    Phosphorous is mobile.It is Energy storage and transfer; cell growth; root and seed formation and growth; winter hardiness; water use
    Potassium is mobile
    Carbohydrate metabolism, breakdown and translocation; water efficiency; fruit formation; winter hardiness; disease resistance
    Secondary elements
    Calcium is immobile
    Cell division and formation; nitrogen metabolism; translocation; fruit set
    Magnesium is mobile
    Chlorophyll production; phosphorus mobility; iron utilization; fruit maturation
    Sulfur is immobile
    Amino acids formation; enzyme and vitamin development; seed production; chlorophyll formation

    Micronutrients
    Boron is immobile
    Pollen grain germination and tube growth; seed and cell wall formation; maturity promotion; sugar translocation
    Chlorine is mobile
    Role not well understood
    Copper is immobile
    Metabolic catalyst; functions in photosynthesis and reproduction; increases sugar; intensifies color; improves flavor
    Iron is immobile
    Chlorophyll formation; oxygen carrier; cell division and growth
    Manganese is immobile
    Involved in enzyme systems; aids chlorophyll synthesis; P and CA availability
    Molybdenum is mobile
    Nitrate reductase formation; converts inorganic phosphates to organic
    Nickel is mobile
    Nitrogen metabolism and fixation; disease tolerance
    Zinc is immobile

    Once inside plants, nutrients are transported to where they are needed, typically to growing points. Once incorporated by the plant, some elements can be immobile while others can be remobilized. Immobile elements essentially get locked in place and that is where they stay. Those that can be remobilized can leave their original location and move to areas of greater demand. Knowing which are mobile or immobile is helpful in diagnosing deficiency symptoms.


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