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Weed management in
Organic Agriculture
Manjunatha, G.A
Tools for prevention
Avoid the entry of weed seeds onto the farm through
• Manures
• Mulching material
• Intercultivation ...
Different practices to control
• Cultural
• Mechanical
• Biological
• Chemical (organically approved)
Liebman and Gallandt...
Cultural Practices
Improve crop competitiveness
• Increase crop density through narrow row
spacing and increased seeding r...
Intercropping
• Having different plant types growing together enhances weed
control by increasing shade and increasing cro...
Sugarcane+finger millet
Sunflower+groundnut
Crop Rotations
• Weeds tend to infest crops with similar life cycles
• Crop rotations limit the buildup of weed population...
Allelopathy
• Allelopathy crops are especially useful because they have the ability
to suppress other plants that attempt ...
Smother Crops
• Prevent seeds from germinating by blocking light, can smother
out some weeds.
• In northern states, oats a...
mustard as cover crop in ragi
Weeding manually
• Hand weeding
• Removing of weeds manually before the flowering of weeds to
avoid weed establishment.
Diff hand Tools
Irrigation
• Drip irrigation is more water efficient .
• Also by directing water to the crop it minimizes weed
germination...
Mulching
• Covering the surface of soil to avoid the entry of sunlight by
using locally available materials like straw, pl...
Wood chips Dry Leaves
Biodegradable paper pieces
Straw
Straw as mulching material in onion crop
Mechanical methods
• Cultivation of the soil with a variety of different tools can
control emerged weeds and disrupt weed ...
High-tech tools
Field cultivator High residue cultivator
High-residue cultivator Flex-tine weeder
Flexible spider weeder Badger weeder
Torsion weederRolling weeder
Basket Weeder
Flame weeding
• Burning of weeds by flame.
• Intense heat causing the cell sap to expand and disrupt cell
walls.
• Pre-eme...
Flame weeder
Solarizing the soil
Steps:
• Cultivate soil properly
• Irrigate soil completely
• Put plastic over the soil
– Weed get coo...
Breeding for Crop Competitiveness and Weed
Suppression
• Plant breeding is one way to improve weed management in
organic s...
Bio Herbicide
Corn gluten meal (WeedBan and Corn Weed Blocker)
• It has been used successfully on lawns and high-value cro...
Weeder Geese(ducks)
They are particularly used as grass weeders
in a variety of crops.
Crops: cotton, strawberries, tree nurseries,
corn , fruit orchards, tobacco, potatoes,
onions, sugar beets etc.
Thank you….
Weed management in organic agriculture
Weed management in organic agriculture
Weed management in organic agriculture
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Weed management in organic agriculture

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Weed management in organic agriculture......regards
manjunath

Published in: Science
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Weed management in organic agriculture

  1. 1. Weed management in Organic Agriculture Manjunatha, G.A
  2. 2. Tools for prevention Avoid the entry of weed seeds onto the farm through • Manures • Mulching material • Intercultivation equipments • Animals • Water etc. Instead of using manure - Use compost.
  3. 3. Different practices to control • Cultural • Mechanical • Biological • Chemical (organically approved) Liebman and Gallandt, 1997
  4. 4. Cultural Practices Improve crop competitiveness • Increase crop density through narrow row spacing and increased seeding rate . • Use transplants, rather than seed. • Choose competitive crop cultivars. • Manage fertility according to crop needs; avoid excess application. • Spot application of fertilizers.
  5. 5. Intercropping • Having different plant types growing together enhances weed control by increasing shade and increasing crop competition with weeds through closer crop spacing. Ex: • soybean +wheat • Sugarcane + finger millet • Sunflower + groundnut
  6. 6. Sugarcane+finger millet Sunflower+groundnut
  7. 7. Crop Rotations • Weeds tend to infest crops with similar life cycles • Crop rotations limit the buildup of weed populations and prevent major weed species. • Altering, narrowly spaced crops with closely spaced crops, shallow rooted with deep rooted crops, cold with warm season crops.
  8. 8. Allelopathy • Allelopathy crops are especially useful because they have the ability to suppress other plants that attempt to grow around them. • Rye is one of the most useful allelopathic cover crops which kills weeds like ragweed (by 43%), pigweed (95%), and common purslane (100%). • North Carolina researchers investigated combinations of herbicide use and cover crop plantings on weed control and reported Rye and clover showed the highest weed control without herbicides.
  9. 9. Smother Crops • Prevent seeds from germinating by blocking light, can smother out some weeds. • In northern states, oats are commonly planted as a “nurse crop” for alfalfa, clover. The oats grow between in the place of weeds and avoid weed emergence. • Ex: Mustard as cover crop in Ragi.
  10. 10. mustard as cover crop in ragi
  11. 11. Weeding manually • Hand weeding • Removing of weeds manually before the flowering of weeds to avoid weed establishment.
  12. 12. Diff hand Tools
  13. 13. Irrigation • Drip irrigation is more water efficient . • Also by directing water to the crop it minimizes weed germination and reduces need to cultivate.
  14. 14. Mulching • Covering the surface of soil to avoid the entry of sunlight by using locally available materials like straw, plastic, papers, wood pieces, dry leaves etc. • Prevent seeds from germinating by blocking light, can smother out some weeds.
  15. 15. Wood chips Dry Leaves Biodegradable paper pieces Straw
  16. 16. Straw as mulching material in onion crop
  17. 17. Mechanical methods • Cultivation of the soil with a variety of different tools can control emerged weeds and disrupt weed reproduction cycles. • Cost effective • Time consuming
  18. 18. High-tech tools Field cultivator High residue cultivator High-residue cultivator Flex-tine weeder
  19. 19. Flexible spider weeder Badger weeder Torsion weederRolling weeder
  20. 20. Basket Weeder
  21. 21. Flame weeding • Burning of weeds by flame. • Intense heat causing the cell sap to expand and disrupt cell walls. • Pre-emergent, and post-emergent flame weeding has been successful in a number of crops. • Flaming has generally proved most successful on young broadleaf weeds. • It is reportedly less successful on grasses.
  22. 22. Flame weeder
  23. 23. Solarizing the soil Steps: • Cultivate soil properly • Irrigate soil completely • Put plastic over the soil – Weed get cooked
  24. 24. Breeding for Crop Competitiveness and Weed Suppression • Plant breeding is one way to improve weed management in organic systems. • Development of crops with increased competitive ability and enhanced weed suppressive qualities . • Crop qualities that promote crop competitiveness include early, rapid establishment in less favorable conditions, crop structures that limit weed access to light and nutrients ,increased plant hardiness etc.
  25. 25. Bio Herbicide Corn gluten meal (WeedBan and Corn Weed Blocker) • It has been used successfully on lawns and high-value crops. • pre-emergent herbicide. Commonly based vinegar or lemon juice or clove oil ingredients • Burnout : 23% acetic acid. • Bioganic: 10% acetic acid plus clove oil and thyme oil. • MATRAN & Weed Bye Bye etc • post-emergent herbicides.
  26. 26. Weeder Geese(ducks) They are particularly used as grass weeders in a variety of crops.
  27. 27. Crops: cotton, strawberries, tree nurseries, corn , fruit orchards, tobacco, potatoes, onions, sugar beets etc.
  28. 28. Thank you….

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