Sunday, 21 December 2014

How to control weeds for rice crop

Weed control is important to prevent losses in yield and production costs, and to preserve good grain quality. Specifically, weeds
  • decrease yields by direct competition for sunlight, nutrients, and water
  • increase production costs e.g., higher labor or input costs
  • reduce grain quality and price
    For example, weed seeds in grain can cause the buyer price to be reduced.
Weed management should be practiced during specific stages of rice production:
During land preparation
Control of weeds during land preparation is crucial to reduce the amount of weed pressure in the field. Land preparation should start 3−4 weeks before planting. Plowing destroys weeds and remaining stubble from the previous crop. Weeds should be allowed to grow before the next cultivation. In addition, a level field helps retain a constant water level that controls weeds.

list collapse For wet seeded rice

  • Plow and harrow several times before planting. Depending on weed population, three or more operations can be done.
  • Allow weeds to emerge for at least 2 weeks then kill by another shallow tillage. This reduces the number of weed seeds in the soil, and greatly reduces weeds for the subsequent crop.

list collapse For dry seeded rice

  • Allow weeds to emerge within 1−2 weeks, then kill them with either a non-selective herbicide or by light cultivation
  • Spray herbicides, and perform manual and/or mechanical weeding.

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