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  • Plant nutrients

    I hope this is of use to some

    Major plant nutrients
    • Nitrogen
    • Phosphorus
    • Potassium
    • Magnesium
    • Calcium
    • Sulphur


    Nitrogen (N)
    Encourages vegetative growth and is therefore important in lawns and leaf crops
    Easily leached from the soil
    Constituent of proteins, nucleic acids and chlorophyll
    Symptoms of deficiency
    Slow, spindly growth
    Yellowing of leaves (chlorosis) – old leaves first
    Flowers and fruits small

    Phosphorus (P)
    Important for root growth and the ripening of fruit
    Must be present in seeds for germination to take place
    Recycled within the plant
    Tends to build up in regularly fertised soil and deficiencies are rare
    Constituent of proteins, nucleic acid and enzymes
    Symptoms of deficiency
    Growth retarded
    Leaves dull blue/green and may fall prematurely
    Flowers and fruit delayed and small

    Potassium (K)
    Essential for good flower and fruit formation
    Increases the general hardiness of the plant
    Symptoms of deficiency
    Poor quality fruits and seeds
    Leaf scorch on older leaves
    Leaves bronzed and rolled inwards and downwards

    Magnesium (Mg)
    Required for correct functioning of photosynthesis and movement of phosphorus
    A constituent of chlorophyll
    Symptoms of deficiency
    Intervein chlorosis
    Leaf tips curl upwards
    Early leaf fall

    Calcium (Ca)
    Required for activity in meristems (growth tip)
    A major constituent of cell walls
    May be unavailable in acid soils
    Symptoms of deficiency
    Weakened cell walls leading to tissue dying
    Inward curling, pale young leaves
    Examples are ‘bitter pit’ in apples, ‘blossom end rot’ in tomatoes

    Sulphur (S)
    Required for production of chlorophyll
    Constituent of proteins and enzymes
    Rarely deficient
    Symptoms of deficiency
    Chlorosis – younger leaves first

    Minor plant nutrients
    • Iron
    • Manganese
    • Boron
    • Copper
    • Zinc
    • Molybdenum


    Iron (Fe)
    Required for the production of chlorophyll
    Constituents of enzymes
    Symptoms of deficiency
    Intervein chlorosis – young leaves first
    Failure to flower and fruit

    Manganese (Mn)
    Required for the production of chlorophyll
    Constituent of enzymes
    Symptoms of deficiency
    Intervein chlorosis – older leaves first

    Boron (B)
    Makes calcium available within the plant
    Involved with the movement of sugars and synthesis of gibberellins (plant hormones)
    Symptoms of deficiency
    Leaves misshapen and fruit malformed
    Flowering suppressed
    Examples are ‘corky core’in apples, ‘brown heart’ in turnips

    Copper (Cu)
    Involved in the correct functioning of enzymes
    Rarely deficient
    Symptoms of deficiency
    Varies in species
    Dark green leaves becoming twisted and withering – young leaves first

    Zinc (Zn)
    Involved in the correct functioning of enzymes
    Required for pollen production
    Symptoms of deficiency
    Varies in species
    Poor development of leaves
    Examples are ‘little leaf’ in citrus fruits, ‘rosette leaf’ in apples

    Molybdenum (Mo)
    Helps in the uptake of nitrogen and in rood nodule activity
    Rarely deficient
    Symptoms of deficiency
    Chlorosis in older leaves
    Suppression of leaf growth
    Example is ‘whiptail’ in brassicas
    aka
    Suzie

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