The practice of following a systematic, rotational sequence of herbicide used in the same field to prevent or control formation of herbicide resistant weeds. In a rotational programme a soil-applied or foliage applied herbicide or both are used in a sequence to take care of annual as well as perennial weeds.
The choice of herbicide depends on the tolerance of crops to particular herbicides, type of weed spectrum, intensity of weed infestation, soil and climatic factors etc. The best rotational programme will aim at maximum cumulative cost benefit ratio and least residual problems and least build-up of tolerant weeds.
Advantages
• Helps in preventing emergence of tolerant weed species (Herbicide is captured in vacuole and inactivated excluding the herbicide from site of action).
• Reduces the quantities of herbicide required for optimum weed control over the years.
• Provides most effective weed control for the duration of crop growth.
• Reduces the building up of herbicide residue problems.
• It offers high cumulative cost-benefit ratio over the years. Weed survey and mapping may be done every year and if any shift in weed flora, appropriate changes in herbicide rotation should be made.
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