Essential and Beneficial elements: Science GK

Essential and Beneficial elements: Science GK

ЁЯФ╗Essential and Beneficial elements:
тЩиA) Essential elements
– Which involved in plant metabolic functions
– Plant cannot complete its life cycle without them i.e essential elementтАЭ.
– There are seventeen essential elements required for plant growth.
C, H, O, N, P, K, Ca, Mg, S, Fe, Mn, Zn, Cu, B, Mo, Cl, Ni.

тЩиClassification of Essential Elements
Based on the amount required by the plant:
i) Primary or major nutrients:
-Required relatively in large quantities by the plants for its growth and development.
-Ex: N, P, K.
ii) Secondary nutrients:
-Required in moderate amounts
– given secondary importance in its supply and management.
Ex: Ca, Mg , S.

Micronutrients:
-Utilized by plants relatively in smaller quantities for their growth and development
but these are equally important & essential to plants .
Ex: Fe, Mn, Zn, Cu, B, Mo, Cl , Ni.
Note:- Macro nutrients are absorbed in 30-100 times in proportion to that of micronutrients .
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ЁЯФ╢b) Classification based on the role of element in plant system:
(According to TRUOG, 1954)
i) Structural Elements : C, H, O
ii) Accessory structural elements : N. P. S
iii) Regulator & Carriers : K, Ca, Mg
iv) Catalyst & Activators : Fe, Mn, Zn, Cu, Mo, Cl, B

ЁЯФ╗B) Beneficial Nutrients/Elements:
-mineral that stimulate the growth
-exhibit beneficial effects at very low concentration.
– They may essential for certain plants species or under specific condition.
Eg. Na,Va,Co,Si
Note:- When plant materials is burned, the remaining plant ash contains all the essential and non-essential elements except C, H, O, N, S.

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