describe the crop weed competition
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heya!!!
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Competition is nothing but the struggle for existence and superiority. Competition exerts a powerful
force in the plant community, irrespective of the mechanism, tending towards limitation or extinction of
the weaker competitors. Competition is maximum when available resources for crop growth become
limited.
Crop weed competition occurs in two broad aspects:
1. Direct competition- for nutrient, moisture, light and space
2. Indirect competition- through exudation and / or production of allelopathic chemicals.
Competition between weeds and crops is expressed by altered growth and development of both
species. Interspecific competition occurs when two or more species coexist in time and space and
simultaneously demand a limited resource. Intraspecific competition occurs when two or more plants
of the same species coexist in time and space and simultaneously demand a limited resource.
Plants compete mostly for nitrogen, phosphorus and potassium (but there are many others).
Phosphorus is usually the most limited nutrient in aquatic ecosystems. Nitrogen is usually the most
limited nutrient in terrestrial habitats. Potassium is often overlooked but some terrestrial weeds can
grow well in K-rich soils. Approximately competition for nutrients constitutes an important aspect of
weed crop competition. Weeds usually absorb mineral nutrients faster than many of our crop plants
and accumulate them in their tissue in relatively large amounts.
Competition for water occurs below ground between roots. The ability to absorb water is related to
rooting volume. However, not only are the dimensions (breadth and depth) of rooting zones important:
so is the degree of water extraction.
In general, for producing equal amounts of dry matter, weeds transpire more water than do most of
our crop plants. In weedy fields, the soil moisture may be exhausted by the time the crop reaches the
fruiting stage, which is often the peak. The consumptive use of water of a common weed Chenopodium album as 550 mm against 479 mm for wheat crop itself. It is because weed can remove
moisture from deeper depth of soil than crops.
Although it varies in duration, intensity, and quality, light regulates many aspects of plant growth and
development. Neighboring plants may reduce light supply by direct interception: shading. Leaves are
the site of light competition. Whenever a leaf is shaded by another, there is competition for light.
hope it helps u!!!
do mark as brainliest!!!
here's your answer!!!
Competition is nothing but the struggle for existence and superiority. Competition exerts a powerful
force in the plant community, irrespective of the mechanism, tending towards limitation or extinction of
the weaker competitors. Competition is maximum when available resources for crop growth become
limited.
Crop weed competition occurs in two broad aspects:
1. Direct competition- for nutrient, moisture, light and space
2. Indirect competition- through exudation and / or production of allelopathic chemicals.
Competition between weeds and crops is expressed by altered growth and development of both
species. Interspecific competition occurs when two or more species coexist in time and space and
simultaneously demand a limited resource. Intraspecific competition occurs when two or more plants
of the same species coexist in time and space and simultaneously demand a limited resource.
Plants compete mostly for nitrogen, phosphorus and potassium (but there are many others).
Phosphorus is usually the most limited nutrient in aquatic ecosystems. Nitrogen is usually the most
limited nutrient in terrestrial habitats. Potassium is often overlooked but some terrestrial weeds can
grow well in K-rich soils. Approximately competition for nutrients constitutes an important aspect of
weed crop competition. Weeds usually absorb mineral nutrients faster than many of our crop plants
and accumulate them in their tissue in relatively large amounts.
Competition for water occurs below ground between roots. The ability to absorb water is related to
rooting volume. However, not only are the dimensions (breadth and depth) of rooting zones important:
so is the degree of water extraction.
In general, for producing equal amounts of dry matter, weeds transpire more water than do most of
our crop plants. In weedy fields, the soil moisture may be exhausted by the time the crop reaches the
fruiting stage, which is often the peak. The consumptive use of water of a common weed Chenopodium album as 550 mm against 479 mm for wheat crop itself. It is because weed can remove
moisture from deeper depth of soil than crops.
Although it varies in duration, intensity, and quality, light regulates many aspects of plant growth and
development. Neighboring plants may reduce light supply by direct interception: shading. Leaves are
the site of light competition. Whenever a leaf is shaded by another, there is competition for light.
hope it helps u!!!
do mark as brainliest!!!
Bikramyadav:
write down the principales of crops weed competition
Kay hoga
Answered by
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crop weed competition means when the weeds have grown in field they have competition with crop that who grow more if the farmer removes weed then the crop won if weed affect crop then weed won
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