NABARD GR A AGRICULTURE ARD STUDY MATERIAL:Essential and Beneficial elements
NABARD GR A AGRICULTURE ARD STUDY MATERIAL
🔷🔷🔷🔷🔷🔷🔷🔷🔷🔷🔷
♨️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.
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 .
🔶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.
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.
WAP FOR DETAILS OF COURSE CURRICULUM AT 8961215410
Comments