Methods of Weed Management

Principles of Weed Management

  • Manipulation of the habitat should be done by utilizing some biological differences between the crop and the weeds with the objective to make the crop in competitive advantage over the weeds.
  • Control measures like tillage and mechanical operations should be directed to reduce the survival mechanisms of the weeds in the soil.
  • Crop production techniques, involving suitable crop rotations and farming systems, as a whole may be utilized to deny the establishment of stable community of perennials which are difficult to control.
  • There is no single method that can be relied upon for the control of complex weed problem. However, using control strategies that include a combination of methods, according to nature's principles may reduce the weed population to an acceptable level.
  • Often the negative effects of weeds are not readily apparent, and it requires imagination and creativity for devising sustainable cropping systems that prevent weed problems.

Different Methods

Preventive

  • The use of good quality rice seeds - is one of the easiest ways to reduce the weed infestations. Weeds have been reported to move from one continent to another along with the seed. Weeds are observed to move from one field to the other, through the exchange of bad quality seed, from one grower to the other. Weed seeds sometimes stuck to the machines and by floating through irrigation water also move from one field to the other.
  • Weeds often mimic the crop in seed size, and shape which enhances their opportunity to contaminate rice seed and spread. Weeds that mature and shatter before the crop tend to spread more slowly and are more localized than weeds that mature at the same time as the rice crop.
  • Early-shattering weeds are spread mostly by the movement of equipment and in water and air.
  • Choose a species/cultivars which has higher growth vigour during initial growth stages and covers the soil surface as rapidly and completely as possible, thus preventing robust growth of weeds.

Eradication

Destroying or removing a weed completely from a crop, an area, or a geographic region. This is accomplished through eliminating the living plants and by exterminating the seeds in the soil, usually by burning or applying by soil sterilants.

Control/suppression

Reducing weed density or damage to an acceptable level. It includes use of such measures like sanitation, cultural / mechanical/ biological/ chemical methods.