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23
Jun

Losses due to weeds

 1.  Weeds compete with the rice plants for nutrients, moisture, sunlight and space, causing a quantitative reduction in the potential yield of rice. 

2.  With increase in adoption of modern cultivars, the high fertility conditions coupled with slow growth rate of high yielding dwarf varieties are conducive for rapid growth and proliferation of weeds. 

3.  In different systems of rice culture, very often the yield losses due to weeds exceed those of t

23
Jun

why weeds are successful

 The weeds become successful because of their characteristics that give them the ability to: 

1.weeds has very high output of seeds and set seed before the main crop ripens.Most of the weeds especially annuals produce enormous quantity of seeds. 

2. It has been observed that among 61 perennial weeds, the average seed-production capacity was 26,500 per plant.

3. Weeds have the capacity to withstand adverse conditions in the field, because they can modify their

23
Jun

Why do weeds cause problems?

 1. Weeds are an important factor in the management of all land and water resources, but their effect is greatest on agriculture. The losses caused by weeds exceed the losses caused by any other category of agricultural pests. 

 
2. Weeds account for 45%, insect 30%, disease 20% and other pests 5% for the losses caused by each. Weed control is important to minimise their direct effects on yield and production costs as well as the indirect effects on grain qual
23
Jun

What is a weed?

                  
  • Weeds are plants in out of place. They are unwanted and undesirable, because they interfere with utilisation of land, sunlight, nutrition and water resources and thus adversely affect the crop yield. 

 

23
Jun

Why weed management is important?

  •  Unwanted and undesirable plants interfere or compete with rice crop in the utilisation of resources like land, sunlight, nutrients and water and thus adversely affect the rice crop yield.
  • Weeds compete with beneficial and desired vegetation, reducing the yield and quality of rice crop.
  • High fertility conditions coupled with slow growth rate of high yielding dwarf rice varieties are conducive for rapid growth and proliferation of weeds.

 

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