Nutritional Disorders in Crop

    • Low supply or complete absence of any of the essential elements will exhibit typical symptoms, which are specific to the particular elements(s).
    • This condition is called as nutrient deficiency and the symptoms as deficiency symptoms.
    • In absence or low supply of elements (deficiency), following common symptoms generally develop in the plants.
    General Deficiency Symptoms
    1. Chlorosis:
    • It is a physiological disease that occurs due to deficiency of mineral elements. (eg. N, K. Mg, Fe, Zn, Mn, S).
    • Leaves become abnormally yellow or white due to reduction of chlorophyll contents.
    2. Mottling:
    • It is a condition of plant surface marked with coloured spots due to anthocyanin pigmentation (eg. due to deficiency of N, K, Mg, P, and S).
    3. Necrosis:
    • It refers to the patch of dead tissues, due to deficiency of K, Mg, Zn, Ca, Mo, Mn, Fe, or B.
    4. Bronzing:
    • Development of bronze/copper colour on the leaves and various parts (eg. K)
    5. Die back:
    • Collapse of growing tip, affecting the youngest leaves and buds (eg. K, Ca, B or Cu)
    6. Scorching:
    • Burning of tissues accompanied by light brown colour. (eg. K, Ca, B or Cu)
    7. Firing:
    • Burning of tissues accompanied with dark brown or reddish brown colour (eg. Mg)
    8. Rosetting:
    • Clustering of leaves due to reduced leaf size and shorter internodal distance (eg. Cu, K, Zn)
    9. Distortion of leaves:
    • Irregular shaping of leaves like cupping, twisting, hooking or curling and also wavy margins.
    • Cupping: B or Mo
    • Twisting / Hooking: Zn / Ca / B
    • Curling: Ca, B or Zn
    • Head distortion: Cu (rice), Mn (Sunflower)
    • Wavy: Zn
    10. Gummosis:
    • Oozing out of cell sap in the form of gummous nature (eg. Cu as in coconut etc.)

Last modified: Wednesday, 6 June 2012, 5:22 PM