Weed control is vital to agriculture, because weeds decrease yields, increase production costs, interfere with harvest, and lower product quality. Weeds also impede irrigation water-flow, interfere with pesticide application, and harbour disease organisms.
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Why should weeds be controlled?

Weeds compete with the crop for light, nutrients and moisture. Some may release toxic chemicals, which may adversely affect the crop growth, while the inclusion of undesirable weeds during harvesting can reduce crop quality and appearance.

How do we control weeds?

  1. Mowing and Cutting. Mowing and cutting can decelerate the production of seed and can limit the growth of weeds. …
  2. Weed Pulling. …
  3. Stabbing. …
  4. Mulching. …
  5. Girdling. …
  6. Tilling. …
  7. Soil Solarisation. …
  8. Flooding.
Why weeds have to be removed?

Because they are plants competing to survive in a limited space, weeds are actively removing nutrients from the soil to grow taller, stronger and healthier each day. … Proactively managing nutrient levels and eliminating weeds are the best ways to ensure crops have the nutrition they need for the entire growing season.

Why do we need to control weeds Class 9?

The undesirable plants that grow along with the crops are called weeds. These weeds, feed on the nutrients provided to the crops and thus reduce the supply of nutrients to the crops, thereby, hindering their growth. The growth of these weeds needs to be limited in order to enhance the growth of the plants.

What is protecting from weeds?

Ans: We can protect the crops from weeds by using different methods, including hand cultivation with hoes, powered cultivation with cultivators, smothering with mulch, lethal wilting with high heat, burning, and chemical control with weedicides or herbicides (weed killers).

What are economic importance of weeds?

Weeds are responsible for significant crop yield losses and financial losses in agricultural production in the order of 10% per year worldwide [1]. Weeds interference in crops dates back to the beginning of agriculture, and they have been able to persist, in spite of long term control operations [2].

Why is it difficult to control weeds?

Weeds compete with crops for space, light, nutrients, and water. They have the ability to take up these resources much faster than crops, which will negatively affect the total yield that can be produced. … These plants can reduce crop yield by up to 40% if they are not removed on time.

Why do we need to understand and know more about weeds?

Correct identification of weeds is an important key to effective weed control. … It is equally important to identify the weeds in their adult stage so that we can understand why they should not be allowed to produce seed. One mature lambsquarters plant may produce 72,000 seeds.

What is weeds Class 8 Short answer?

The unwanted plants which grow along with a cultivated crop are called weed. The type of weed vary from field to field,crop to crop,season to season. For Ex:Wild oat,grass, Amaranthus, chenopodium etc. The process of removing weeds from a crop field is called weeding.

Why should the weeds be removed Class 4?

The unwanted plants that grow in the fields along with crop plants are known as weeds. They should be removed because they compete with the crop plants for space, light, minerals and nutrients, thereby increasing the competition for these crops.

Why should we remove weeds from the field how can we control the weeds?

It’s important to rid your garden of weeds because they rob your soil and your plants of important nutrients and water. Certain weeds such as nut grass actually reduce crop yield on farms because their roots release chemicals that are harmful to surrounding plants.

How are weeds controlled by farmers?

Weeds (plants growing where they are not wanted) reduce crop yield, increase production cost, and may harbour insects and diseases that attack crop plants. Methods employed to control weeds include hand weeding, mechanical cultivation, application of chemicals acting as herbicides, and a combination

How do weeds affect the growth of crops?

Weeds affect the growth of crops by competing with crop plants for water, space, nutrients and sunlight. Thus, the crop yield is reduced. … Thus, they provide shelter to them and promote plant diseases. Their seeds mix with the food grain and lower the quality of food grain yield.

What do you understand by weeds?

A weed is a plant considered undesirable in a particular situation, “a plant in the wrong place”. Examples commonly are plants unwanted in human-controlled settings, such as farm fields, gardens, lawns, and parks.

What are the five benefits of weeds?

Beneficial weeds can accomplish a number of roles in the garden or yard, including fertilizing the soil, increasing moisture, acting as shelter or living mulch, repelling pests, attracting beneficial insects, or serving as food or other resources for human beings.

Why weeds are successful competitors?

Weeds have great capacity to compete for water, light and nutrients. They are found in numerous habitats. Many species of weeds have morphological characteristics that render them more competitive, e.g. they may show greater root development [4], be taller than the crop [5] or have a greater leaf area [6].

Why weeds should be controlled during and not after seedling stage?

Weed seeds can germinate after being dormant for long periods of time. They can also tolerate extremes in weather such as tem- perature and moisture. To prevent seed dispersal, you should control weeds before they produce seeds.

Why do we identify weeds?

Besides competing for plant nutrients weed also compete for available soil moisture. … Weed control is an essential part of all crop production systems. For control of weeds, weed identification is very important because herbicides have selective kill of weeds.

What are weeds give two examples of weeds need to control them and methods to control them?

Ex- Clover and Dandlion. Two effective methods to control weeding are Mulching and Pulling. In mulching, the weeds are covered with black plastics or damp newspapers or anything to prevent it from receiving sunlight and cease their growth.