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- Because they grow in the same places as crops, weeds compete for space, light, and resources such as water and nutrients. It is estimated that, worldwide, these plants can reduce harvests by up to 30%. They are the organisms that cause the most losses, even more than pests and crop diseases.
theconversation.com/weeds-the-good-the-bad-and-the-sometimes-beautiful-203631
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Jul 30, 2022 · The objective of this review is to highlight the problem of weed infestation on farmlands in Europe, and identify the environmental threats that result from the use of herbicides in the context of the European Biodiversity Strategy.
- Impersonators of Cultivated Plants
- Weeds: Are They Always Bad?
- Consequences of Improper Handling
- Can We Live with Weeds?
Weeds are generally annual or pluri-annual herbaceous plant species that are adapted to environments that are frequently disturbed, such as fields of crops. Their survival strategy is to resemble the crop as much as possible, to maximise their chances of survival and reproduction. To accomplish that, they germinate, flower, or mature at times simil...
Because they grow in the same places as crops, weeds compete for space, light, and resources such as water and nutrients. It is estimated that, worldwide, these plants can reduce harvests by up to 30%. They are the organisms that cause the most losses, even more than pests and crop diseases. Apart from crop losses, weeds can reduce the quality of t...
For a plant to become a “weed”, it must thrive in fields of crops, and that is where the paradox comes in: many of the most competitive and aggressive weeds are often this way due to inappropriate management. For example, an excessive use of herbicides along with poor crop rotation has promoted, in several species, the selection of biotypes that ar...
To get out of this vicious circle, it is necessary to diversify – not just crops, but also soil-management tactics, weed-control tools, harvest times, and even mentalities. Over the medium and long term, the diversification of agroecosystems also results in the diversification of weed communities. Some recent studies confirm that the greater the di...
Dec 6, 2021 · Metrics. March: The gains from decades of agricultural intensification, facilitated by artificial fertilizer and the Green Revolution, have also seen a concurrent and potentially linked increase...
- Ryan Scarrow
- Ryan.Scarrow@nature.com
Weeds cause many problems. Most importantly, weeds can reduce crop yield. Weeds cause greater crop losses if they occur in large numbers, if they get a head start on the crop, if they are especially vigorous, or if they produce allelopathic substances.
May 1, 2023 · In this review, we first discuss why weeds might reduce crop yield via mechanisms other than resource competition, the implications of these alternative hypotheses on the paradigm for crop–weed interactions, and the physiological and developmental changes induced by weed perception alone.
Jul 8, 2020 · Sustainable strategies for managing weeds are critical to meeting agriculture’s potential to feed the world’s population while conserving the ecosystems and biodiversity on which we depend. The dominant paradigm of weed management in developed countries is currently founded on the two principal tools of herbicides and tillage to remove weeds.
Nov 6, 2009 · An undeniable and expensive consequence of agricultural practices is the adaptation of weeds to agricultural systems. Weeds are responsible for significant crop yield losses and for financial losses in agricultural production – in the order of 10% per year worldwide (Oerke, 2006).
