Written Paper

Role of macro and micro nutrients in the plant growth and development  [2011]

Imran, M. (National Agricultural Research Centre, Islamabad (Pakistan). Crop Sciences Inst.) Gurmani, Z.A. (National Agricultural Research Centre, Islamabad (Pakistan). Crop Sciences Inst.)

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There is a large number of elements in nature out of which sixteen are important for the proper growth and development of crop plants. Carbon, Hydrogen, Oxygen, Nitrogen, Phosphorus, Potash, Calcium, Magnesium and Sulfur are called macro or major nutrients and required in comparatively large amounts. Iron, Copper, Zinc, Boron, Molybdenum, Manganese and Chloride are the micro or minor nutrients which required in smaller quantities for vegetative and reproductive growth of crop plants. C, H and O contribute the 85-9 % of the total plant content. N gives dark-green colour to crop plants and it increases the vegetative growth of crop plants. It is most important for preparation of starch in leaves and production of amino acids. P is the constituent of certain nucleic acids, phosphatides, chromosomes and "coenzymes. P works as a catalyst in about 60 enzymatic systems of the plants and regulates the water in plants and reduces the negative effects of salts in the plants. Ca is the important constituent of plant cell wall and it promotes early root growth and development. Micro nutrients are always required in very little amounts but play a very important role in the physiological processes of the crop plants.

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Science Technology and Development (Pakistan)

ISSN : 0254-6418