How to Find out Most Important Weed?

How to Find out Most Important Weed?
Importance value index (IVI) is used to determine the overall importance of each species . In calculating this index, the percentage values of the relative frequency (RF), relative density (RD) and relative abundance (RA) are summed up together. The spp. which has maximum IVI is considered most important,
Total number of individuals of a species in all quadrates
Density = -----------------------------------------------------------------
Total number of quadrates studied
Total number of quadrates in which the species occurred
Frequency (%) = ----------------------------------------------------------------------- x 100
Total number of quadrates studied
Total number of individuals of a species in all quadrates
Abundance = -----------------------------------------------------------------
Total number of quadrates in which the species occurred
Total number of individuals of the species
Relative density = ------------------------------------------------ x 100
Number of individuals of all the species
Frequency of the species
Relative frequency = ------------------------------------------------ x 100
Total frequency of all the species
abundance of a species
Relative abundance = -------------------------------------------------- x 100
Sum of abundance of all spp.
Importance Value Index (IVI)= Relative Frequency (RF) + Relative Density (RD) + Relative Abundance (RA)
Summed Dominance Ratio (SDR) = Importance value Index/3
= (RF + RD + RA)/3
Video links
1. Crop Weed Competition: A Biological Interaction - Intra and Interspecific • Crop Weed Competition:...
2. Biological interactions, mutualism, Commensalism, parasitism, Neutralism, Amensalism, competition • Explanation of Biologi...
3. Crop Weed Association, Crop Weed Interference, Crop Weed Competition and Allelopathy • Crop Weed Association,...
4. Types of Weeds: Meaning and Examples • Types of Weeds: Meanin...
5. Difference in Weeds, Off type ,Volunteer and Rogue Plants • Difference in Weeds, O...
6. Concept Based Questions on Weed Matching • Concept Based Question...
7. Classification of Herbicides • Classification of Herb...
8. Methods of Application of Herbicides • Methods of Application...
9. Formulation and Calculation of Herbicides • Formulation and Calcul...
10. Mechanism of Herbicidal Selectivity • Mechanism of Herbicida...
11. Metabolism of Herbicides: A major pathway of herbicidal selectivity • Metabolism of Herbicid...
12. Weed Control Efficiency, Weed Smother Efficiency and Weed Index: Concept and Numerical • Weed Control Efficienc...
13. Factors Affecting Herbicide Efficacy • Factors Affecting Herb...
14. Fate of Herbicides in Soils: Decomposition and Transfer • Fate of Herbicides in ...
15. Part 1: Persistence of Herbicides in Soils • Part 1: Persistence of...
16. Part 2: Persistence of Herbicides in Soils: Crop management strategies to reduce it • Part 2: Persistence of...
17. Difference in Safener, Antidote, Protectants and Adjuvants and Details of Safeners • Difference in Safener,...
18. Herbicide Adjuvants: Advantages, Classification and Mode of Action
• Herbicide Adjuvants: A...
19. Types of Surfactants and Their Use in Herbicide Spray • Types of Surfactants a...
20. Differences in Prevention, Eradication, Weed Control and Weed Management • Differences in Prevent...
21. Effective Weed Management Strategy • Effective Weed Managem...
22. Reasons: How do Preventive Methods Control Weeds? • Reasons: How do Preven...
23. Limitations and Constraints in Adoption of Preventive Methods of Weed Control • Limitations and Constr...
24. Reasons: How do Cultural Methods Control weeds? Merits and Demerits • Reasons: How do Cultur...
25. Physical Methods of Weed Control • Physical Methods of We...
26. Biological Methods of Weed Control • Biological Methods of ...
27. Part I: Mode of Action of Herbicides • Part I: Mode of Action...
28. Part II: Mode of Action of Herbicides • Part II: Mode of Actio...
29. Integrated weed Management • Integrated weed Manage...
30. Mechanisms of Weed Persistence • Mechanisms of Weed Per...
31. Causes of Hardiness in Weeds • Causes of Hardiness in...
32. Phytosociological Attributes of Weeds • Phytosociological Attr...
33. Concept Clarity Through Multiple Choice Questions • Concept Clarity Throug...
34. How to Answer Matching Questions on Mode of Action of Herbicides • How to Answer Matching...
35. Matching on Weed Control Methods • Matching on Weed Contr...

[@IndianForestService-1]

Sir, humble request to make video on "Crop Calender of Flood affected Area".

[@sapnamani7697]

Thanku soo much sir for viedo.... And please keep posting 🙏

[@amitbhatnagarclasses247]

All the best

[@ajmulhasan720]

Thank you sir

[@KKS-kr7xs]

Very helpful sir thanks

[@sandeepsn8771]

Thank you sir 🙏

[@ayushikushwaha7697]

Thank you so much sir. Sir, After completing weed science sir please make video on hereditary and. Variation..sir I'm studying hereditary and variation from arun katyan but i can't understand the fact and sir its hard to understand for me.. kindly requesting you sir please make video on hereditary and variation.🙏

[@amarwankhede2124]

Sir plz make video on Absorpition and Translocation Of herbicide....

[@iwasthink.merepasstumho.1201]

🙏 sir.