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AGR 3102 Principles of Weed Science Unit 4: Weed Control

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Title: Weed 3: Weed establishment Author: ahmadm03 Last modified by: User Created Date: 2/26/2012 3:25:54 PM Document presentation format: On-screen Show (4:3) – PowerPoint PPT presentation

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Title: AGR 3102 Principles of Weed Science Unit 4: Weed Control


1
AGR 3102Principles of Weed Science Unit
4Weed Control
  • Muhammad Saiful Ahmad Hamdani

2
Weed Control Practices/Strategies
Crop growth
Weed interference
Time
3
  • No control practice there is no weed control
    method applied to weeds interfering with crops in
    the field. As a result, weeds vigorously emerge
    and compete with crops, causing crop to suffer
    and in the end, only minimum or no production
    obtained from the crops. Loss in crop yield is
    between 85-100 under this condition.

4
  • Crop growth

Weed interference
Time
5
  • One-time control practice control method is
    only applied once to control weed. This control
    method is either applied in the early period of
    crop growth (crop is still small), or during crop
    establishment (crop is actively growing), or in
    the late period of crop growth (crop at the
    flowering stage). As a result, higher yield will
    be produced by crops compared to the no control
    approach. However, crop is still severely
    affected by weed competition during the
    non-control period. Loss in crop yield is between
    50-70.

6
Crop growth
Weed interference
Time
7
  • Continuous control practice weed is being
    continuously controlled. In this method, crop
    will be always free from weed infestation during
    their growth. The highest yield will be obtained
    from continuous control, and only small yield
    reduction will be observed (less than 25).
    However, this control approach will greatly cost
    time and money spent on weed control, especially
    on labour, machineries, and herbicide costs.

8
4. Critical Period of Weed Control
  • The period of time in which weed control is
    necessary to avoid significant yield loss
    (Nazarko et al., 2005).
  • OR alternatively an interval in the growth cycle
    of the crop when it must be kept weed-free to
    prevent significant yield losses.
  • Different crops are susceptible to interference
    from weeds at different times, but critically
    during establishment of the crop.

9
  • Importance
  • - Timing of control applications is crucial for
    controlling weeds effectively and preventing
    excessive interference with the crop.
  • - Knowledge of the critical period of weed
    control can also allow for reduced herbicide use.
  • - Can save time and money on weed control costs.
  • Critical period of weed control is all about the
    right timing

10
Hypothetical yield of crop as affected by length
of early period of weed control
11
Hypothetical yield of crop as affected by length
of early period of weed interference
12
Hypothetical critical period of weed control
13
(No Transcript)
14
  • However, continuous weed control still needed
  • - reduce weed seed production seed bank.
  • - avoid movement/transfer of other pests from
    weeds to crops.
  • - avoid possible contamination of weed
    parts/seeds in the crop yield.
  • - increase harvest efficiency.
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