What are the prevented measure for weed control
Answers
Explanation:
adding weedicides,in a limited amount,plucking before it reaches reproductive phase
Answer:
Cultural methods Edit
Stale seed bed Edit
Another manual technique is the ‘stale seed bed’, which involves cultivating the soil, then leaving it fallow for a week or so. When the initial weeds sprout, the grower lightly hoes them away before planting the desired crop. However, even a freshly cleared bed is susceptible to airborne seed from elsewhere, as well as seed carried by passing animals on their fur, or from imported manure.
Buried drip irrigation Edit
Buried drip irrigation involves burying drip tape in the subsurface near the planting bed, thereby limiting weeds access to water while also allowing crops to obtain moisture. It is most effective during dry periods.[8]
Crop rotation Edit
Rotating crops with ones that kill weeds by choking them out, such as hemp,[9] Mucuna pruriens, and other crops, can be a very effective method of weed control. It is a way to avoid the use of herbicides, and to gain the benefits of crop rotation.
Biological methods Edit
A biological weed control regiment can consist of biological control agents, bioherbicides, use of grazing animals, and protection of natural predators.[10] Post-dispersal, weed seed predators, like ground beetles and small vertebrates, can substantially contribute to the weed regulation by removing weed seeds from the soil surface and thus reduce seed bank size. Several studies provided evidence for the role of invertebrates to the biological control of weeds[11][12]
Animal grazing Edit
Main article: Conservation grazing
Companies using goats to control and eradicate leafy spurge, knapweed, and other toxic weeds have sprouted across the American West.[13]
Chemical methods Edit
"Organic" approaches Edit
Weed control, circa 1930-40s
A mechanical weed control device: the diagonal weeder
Organic weed control involves anything other than applying manufactured chemicals. Typically a combination of methods are used to achieve satisfactory control.
Sulfur in some circumstances is accepted within British Soil Association standards.
Herbicides Edit
The above described methods of weed control use no or very limited chemical inputs. They are preferred by organic gardeners or organic farmers.
However weed control can also be achieved by the use of herbicides. Selective herbicides kill certain targets while leaving the desired crop relatively unharmed. Some of these act by interfering with the growth of the weed and are often based on plant hormones. Herbicides are generally classified as follows:
Contact herbicides destroy only plant tissue that contacts the herbicide. Generally, these are the fastest-acting herbicides. They are ineffective on
perennial plants that can re-grow from roots or tubers.
Systemic herbicides are foliar-applied and move through the plant where they destroy a greater amount of tissue. Glyphosate is currently the most used systemic herbicide.
Soil-borne herbicides are applied to the soil and are taken up by the roots of the target plant.
Pre-emergent herbicides are applied to the soil and prevent germination or early growth of weed seeds.
In agriculture large scale and systematic procedures are usually required, often by machines, such as large liquid herbicide 'floater' sprayers, or aerial application.
Bradley method Edit
See also Bradley Method of Bush Regeneration, which uses ecological processes to do much of the work. Perennial weeds also propagate by seeding; the airborne seed of the dandelion and the rose-bay willow herb parachute far and wide. Dandelion and dock also put down deep tap roots, which, although they do not spread underground, are able to regrow from any remaining piece left in the ground.
Hybrid Edit
One method of maintaining the effectiveness of individual strategies is to combine them with others that work in complete different ways. Thus seed targeting has been combined with herbicides. In Australia seed management has been effectively combined with trifluralin and clethodim.[7]