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  • Pakistan Agriculture and Farming Cover

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    PakAgriFarming is commited to high standards in extension of agriculture in Pakistan through simple and factual information and topics related to the hottest issues in Pakistan Agriculture.

  • Approved cotton varieties for Punjab 2014

    کپاس کی کاشت کے لیے موزوں اقسام

    پنجاب میں کپاس کی کاشت کا آغاز ہو نے والا ہے اور پیشتر علاقوں میں میں رنیع کی فصل کی برداشت کا وقت قرہب ہے۔ اس لیے بروقت کپاس کے بیج کا انتخاب اچھی پیداوار حاصل کرنے کی طرف پہلا قدم ہے۔۔۔

  • Introduction, characteristics and objectives of tillage

    Intoduction and Objectives of Tillage

    Tillage is the primary requirement before any cropping activity. Perhaps, if one is ignorant about tillage, he knows nothing about farming. So, let's look into a brief intro...

  • The Next 10 Years of Tunnel Farming in Pakistan

    The Next 10 Years of Tunnel Farming in Pakistan

    It's been 10 years since the introduction of tunnel farming in Pakistan, the conversion rate has been slow but are there any chance of rapid growth of tunnel farming in Pakistan? Let's disover...

  • Wheat Production Technology for Rainfed Areas of Punjab for 2013-14

    Wheat Production Technology for Rainfed Areas of Punjab for 2013-14

    Wheat is the most important cereal crop in Pakistan and staple food. Wheat has a large share of cultivated land in rabi season and hence large production is expected...

PakAgriFarming

Wednesday, September 25, 2013

Ideal Characteristics of Weeds

Posted by Unknown On Wednesday, September 25, 2013

A weed is defined as a plant of its proper place or where it is not required. A weed has more potential than the crop, compete with the crop, seed formation and distribution is before the seed and fruit production from the crop. 
Cotton field infested with cynodon dactylon and other weeds
Cotton field infested with Cynodon dactylon and other weeds
Here are the few characteristics which must be present in any plant to call them infestation and problematic for the crop (because there are some cropping systems such as relay cropping and intercropping where 2,3 crops are in the same field.)

IDEAL CHARACTERISTICS OF WEED

1. They have ability to grow well under many environmental conditions.
2. Rapid growth rate both in vegetative and flowering stage.
3. Cross-pollination is very common which enable new genetic recombination better suited to the environment.
4. The seed production continues till the condition remains favorable.
5. Self-compatibility but not complete autogamy or apomixy.
6. Greater longevity of the seeds.
7. Discontinuous germination.
8. Bulk of seeds are produced under the favorable environmental conditions.
9. The plants have modification for short and long distance seed dispersal.
10. Vegetative reproduction is vigorous in case of perennial weeds. They can even grow from fragments uprooted or cut weeds.
11. The perennial weeds cannot be easily uprooted from the field.
12. They also produce specific plant chemicals (allochemicals and phytochemicals) in the ground for competing the crop plants.


Apomixy is defined as total limitation of sexual reproduction which greatly reduces the chances of new genetic combinations.