Tatlong Klase ng Damo sa Palayan | Grasses , Sedges at Broadleaves | Dapat Alam mo ito
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Weed management should be practiced in specific stages of rice production:
During land preparation
In the nursery
During early crop growth
During Land Preparation:
Control of weeds during land preparation is important to reduce the amount of weed pressure in the field. Land preparation should begin 3−4 weeks before planting. Ploughing destroys weeds and remaining stubble from the previous crop. Weeds should be allowed to grow before the next cultivation. Also, a level field helps retain a constant water level that controls weeds.
For Wet Seeded Rice
Plow and harrow various times before planting. Depending on weed population, three or more operations may be done.
Allow weeds to emerge for at least 2 weeks then kill by another shallow tillage. It reduces the number of weed seeds in the soil, and greatly reduces weeds for the subsequent crop.
For Dry Seeded Rice
Allow weeds to emerge within 1−2 weeks, and then kill them with either a non-selective herbicide or by light cultivation.
Spray herbicides, and perform manual and/or mechanical weeding.
Controlling Weeds in the Nursery:
Prepare land two weeks before seeding.
While using soil mix for nursery beds, you must make sure the soil is clean and free of weed seeds.
If there are weed seedlings in the nursery bed, then separate them from rice seedlings during pulling and bundling to avoid planting weeds.
Apply pre-emergence herbicide 2−3 days.
Why weed control in rice is important?
Weed control is crucial to prevent losses in yield and production costs, and to preserve good grain quality.
Weeds decrease yields by direct competition for sunlight, nutrients, and water
It increase production costs e.g., higher labor or input costs
It reduces grain quality and price
How to Control Weeds in Rice?
Weed Management in Nursery:
Apply any one of the pre-emergence herbicides like, Pretilachlor + safener 0.3kg per hectare, on 3rd or 4th day after sowing to control weeds in the lowland nursery.
Then, apply a thin film of water and allow it to disappear.
Avoid drainage of water as it will control germinating weeds.
Butachlor 2.0 l per hectare (or) Pendimethalin 2.5 l per hectare (or) Anilophos 1.25 l per hectare.
Herbicides must be applied on 8 DAS with thin layer of water in the field.