Weed control detail ppt.pptx practices and controls
- 1. WEED CONTROL PROCEDURES IN ORGANIC FARMING By Farhan Ahmad Class # 424
- 2. Tools for prevention Avoid the entry of weed seeds onto the farm through • Manures • Mulching material • Intercultivation equipments • Animals • Water etc.
- 3. Different practices to control • Cultural • Mechanical • Biological • Chemical (organically approved) Liebman and Gallandt, 1997
- 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. 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
- 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. 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.
- 10. 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. While in Peshawar smother crops are Sorghum-sudan and lablab bean • Ex: Mustard as cover crop in Ragi.
- 11. mustard as cover crop in ragi
- 12. Weeding manually • Hand weeding • Removing of weeds manually before the flowering of weeds to avoid weed establishment.
- 13. Diff hand Tools
- 14. Irrigation • Drip irrigation is more water efficient . • Also by directing water to the crop it minimizes weed germination and reduces need to cultivate.
- 15. 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.
- 17. Straw as mulching material in onion crop
- 18. 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
- 21. Basket
- 22. 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.
- 23. Flame weeder
- 24. Solarizing the soil Steps: • Cultivate soil properly • Irrigate soil completely • Put plastic over the soil – Weed get cooked
- 27. Thank you….