Hydroponics: Definition | Types | Advantage | Disadvantage

 Criteria for essentiality in plant nutrition :

This criteria is proposed by two scientists

Arnon and Stout (1939)

 Arnon, re- proposed in 1952 Criteria for essentiality in plant nutrition.

There are three criteria of essentiality in plant nutrition :

1. The element must be absolutely necessary for supporting normal growth and reproduction. In the absence of the element the plant do not complete their life cycle or set the seed.

2. The requirement of element must be specific and not replaceable buy another elements.

 In other words deficiency of any one elements cannot meet by the supplying some other element.

3. The element most directly involved in metabolism of the plant.

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Based upon the above criteria only a few elements have been found to be absolutely essential for plant growth and metabolism these element are further divided into two broad categories based on their quantitative requirement.

1. Macronutrients

Carbon, hydrogen, oxygen, nitrogen, phosphorus, Sulphur, potassium, calcium and magnesium are considered as macronutrients.

2. Micronutrients

Iron, manganese, copper, molybdenum, zinc, boron, chlorine, and nickel are considered as micronutrients.

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