Essential and Beneficial elements: Science GK
🔻Essential and Beneficial elements:
♨A) Essential elements
– Which involved in plant metabolic functions
– Plant cannot complete its life cycle without them i.e essential element”.
– 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.
♨Classification 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.
-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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🔶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
🔻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.
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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