What is the role of weed?
Weeds can perform vital ecosystem services such as protecting and restoring exposed or degraded soils. In addition, some weeds provide habitat for beneficial organisms, and thereby contribute significantly to natural and biological control of some insect pests. Certain weeds also make nutritious food or fodder.
How can you measure the size of a weed infestation?
The most accurate way to estimate the weed population of a paddock is to count the number of plants in an area of known size at a number of locations. Use a quadrant, which may be square or circular, to carry out weed plant counts.
What is weed management in agriculture?
It is the process of minimizing the weed population and their growth below the level of economic injury to the crop with minimum environmental pollution. Weeds can be managed by adopting any suitable method of weed control & if needed by combining two or more methods of weed control.
What does weed do to the soil?
Their results showed that weed extracts increased soil pH and cycling nutrients, reducing Al up to 20 cm of depth in acid subsoil. The chemical composition of the plant material varies with the weeds species.
What weed concept?
weed, general term for any plant growing where it is not wanted. Ever since humans first attempted the cultivation of plants, they have had to fight the invasion by weeds into areas chosen for crops. Other cultivated plants, when transplanted to new climates, escaped cultivation and became weeds or invasive species.
What are the characteristics of weed?
Characteristics of weeds are as follows:
- ((1) The weeds seed germinate early and the seedlings grow faster.
- (2) They flower earlier, run to seed in profusion and mature ahead of the crop.
- (5) They can survive even under adverse conditions.
- (6) They are prolific and have a very high reproductive capacity.
What is weed assessment?
The WRA system is a question-based assessment of the weed potential of plants proposed for import. Assessment involves answering up to 49 questions on specific characteristics of a plant. The answers generate a numerical score relating to the weed potential of that plant.
What is weed population density?
Weed density measures the number of the species in a unit area, sometimes expressed as a percentage.
What is weed management?
Weed control is important in agriculture. Methods include hand cultivation with hoes, powered cultivation with cultivators, smothering with mulch, lethal wilting with high heat, burning, and chemical control with herbicides (weed killers).
What are the principles of weed management?
Weed Management principles are consistant with prevention, eradication and control.
How does weed affect plant growth?
Weeds affect the growth of crops by competing with crop plants for water, space, nutrients and sunlight. Thus, the crop yield is reduced. Some of the weeds are alternate hosts of pathogens in their life cycle. Thus, they provide shelter to them and promote plant diseases.
How does weed affect the crop plants?
Weeds are unwanted plants in the cultivated field. They compete with the crop plants for food, space and light. They take up the nutrients and reduce the growth of the crop.