WEEDS: What you should KNOW
1. Weeds are mainly of three types, broadleaves, sedges and grasses.
2. Weeds compete with crops for nutrients, water, and light.
3. Weeds can be controlled manually (hand weeding), mechanically (using weeders or other implements when crops are line
1. Weeds are mainly of three types, broadleaves, sedges and grasses.
2. Weeds compete with crops for nutrients, water, and light.
3. Weeds can be controlled manually (hand weeding), mechanically (using weeders or other implements when crops are line
sown), through cultural practices (use of weed competitive crop cultivars, stale seed-beds, mulching, crop rotation) and /or chemically (using herbicides).
4. Chemical management of weeds can be done at three stages: Pre-plant (burn-down), pre-emergence and post-emergence.
4. Chemical management of weeds can be done at three stages: Pre-plant (burn-down), pre-emergence and post-emergence.
5. Pre-plant burn-down herbicides are non-selective and are applied before you sow the crop to kill the existing weeds. These herbicides are especially important under zerotill/conservation agriculture based systems.
6. Pre-emergence herbicides are applied after crop seeding but
6. Pre-emergence herbicides are applied after crop seeding but
prior to emergence of weeds, 1-3 days after seeding or transplanting, by ensuring adequate moisture at the time of spray.
7. Post-emergent herbicides are applied after the crop and weeds are emerged, generally at 3-4 leaf stage.
8. Select the appropriate herbicides for specific
7. Post-emergent herbicides are applied after the crop and weeds are emerged, generally at 3-4 leaf stage.
8. Select the appropriate herbicides for specific
crop considering type of weed that is a problem in the field (broadleaf, sedge or grass) and stage of weed control (i.e. pre-plant, pre-emergence or post-emergence).
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