How to control weeds in agriculture


  1. Mowing and Cutting. Mowing and cutting can decelerate the seed production and can limit the growth of the weed. This does not apply to all types of crops.
  2. Mulching. This is one of the best methods for protecting crops from weeds. Mulching is another weed control method that can be done in relatively small areas.
  3. Solarization for Weed Control. Solarizing your soil involves covering an area of weedy ground with a clear and heavy plastic sheet.
  4. Crop Competition. The effective way to control weed growth is to have highly competitive crops. …
  5. Sanitation. By using clean seed will prevent the new weed problems. Mowing weeds around the field edges or after harvest prevents weeds from going to seed.
  6. Weed Pulling. Uprooting plants by pulling is also an effective method to prevent the spread of herbaceous and floating weeds.


What are weeds and how can you control them?

GROUP 2 HERBICIDES• Apply postemergence when seedling alfalfa is in the second trifoliolate stage or larger and when weeds are 1-3 in. tall. Use crop oil concentrate or nonionic surfactant and add 1-2 qt./. A of liquid fertilizer to spray solution. Add 1-2 pt. Butyrac 200 if ragweed or lambsquarters are a problem.

How to naturally kill weeds?

 · Cultural weed control refers to any method that involves maintaining field conditions such that weeds are less likely to become established and increase in number. Examples of cultural weed control would be to crop rotation, avoiding overgrazing of pastures, and maintaining good soil fertility. Mechanical or Physical methods of weed control:

What are the methods of controlling weeds?

 · Protecting Organic Agricultural Crops from Weeds or Weed Management Methods in Organic Farming 1. Mowing and Cutting. Mowing and cutting can decelerate the seed production and can limit the growth of the weed. This… 2. Mulching. This is one of the best methods for protecting crops from weeds. …

How to naturally control weeds?

Manage Weeds on Your Farm shows you how to outsmart your weeds by identifying the right tactic for the right weed at the right time, which will reduce as much as possible the labor required, while ensuring your weeds don’t impact crop yields. Note: Manage Weeds on Your Farm is focused on the weeds of arable cropping systems. It does not discuss the management of …


What are the advantages of weeds?

Advantages of Weeds: Some lawn and garden weeds bring nutrients and water up from deep in the soil and down from the air, and subsequently make them available to microbes & plants. Some weeds break up the hardpans and compaction and manage erosion. Weeds Check Wind, Water, and Soil Erosion:

How does climate affect weeds?

Climate can effect variations in cuticle development, vegetative growth, vigor, competitiveness, etc. Climate thus has profound produce on the persistence of weeds which can adapt to a wide variety of climates. The important climatic factors are light, temperature, rainfall, wind & humidity.

What is the role of light intensity in weeds?

Light intensity, quality, and duration are important in influencing the germination, growth, reproduction & distribution of weeds. Photoperiod governs the seed setting and maturation and on the evolution of different ecotypes within a weed species.

What is weed biology?

Weed biology is an integrated knowledge with the mean of reduces the negative effects of weeds and promoting positive characteristics in the agroecosystem. It includes the biology and ecology of individual weed species & weed communities.

What are poisonous weeds?

Poisonous Weeds: E.g. Parthenium, Datura, Poison, ivy (Rhus sp), etc. Based on morphology: Based on the morphology of the plant, the weeds are classified into three categories. This is the main widely used classification by the weed scientists.

What is the classification of weeds?

Classification according to the nature of the stem: Based on the development of bark tissues on their stems & branches, weeds are classified as a woody, semi-woody and herbaceous species.

Where did weeds originate?

Classification according to an origin of weeds: Several weeds in India originated in some other part of the world. For e.g. Convolvulus sp –Eurasia, cyperus –Euphorbia,-Europe, Lantana –Africa. Classification according to soil: Of the several variables of soil, soil pH is implicated frequently with the distribution of weed species.

How does weed management work on farm land?

Any weed management programme on farm land essentially begins with the adoption of good crop husbandry practices leading to a sturdy crop which could overpower the weeds, and make their subsequent control easy and more economical. On the contrary, when the fundamental principles of good crop husbandry are ignored, the crops become so weedy that their control is often disappointing.

Why is it important to sow before weeds?

In this respect it is also essential to adopt a sowing method which will ensure emergence of the crop prior to the weeds. As a matter of ecological principle, the first plants to appear on the ground tend to eliminate the later visitors.

What is a stale seedbed?

A stale seedbed is one where the initial 1-2 flushes of the weeds are destroyed before planting of a crop. This is achieved by soaking a well prepared field with either irrigation (or rain) and allowing the weeds to germinate. At this stage a shallow tillage or a non-residual herbicide like paraquat may be used to destroy the dense flush of young weed seedlings.

Can tillage break clods?

The subsequent tillage operations should break these clods into smaller units to further expose the shrivelled weed propagules directly to the hot sun. Scientific studies have been conducted with certain perennial weeds to find their optimum growth stages for practising summer tillage when the downward translocation of food from their leaves to the rhizomes shall be minimal.

Why do we need to tillage in summer?

Initial tillage of the field in summer for this purpose should encourage clod formation . These clods upon drying desiccate the weed propagules within much better than a pulverised soil.

Why did summer tillage decline?

This has so happened in response to the increased cropping intensities adopted by the farmers after the expansion of irrigation facilities in the country. This is again undesirable from the point of view of control of weeds, particularly of the perennial ones.

What is the purpose of break crops in crop rotation?

In essence, the break crops in crop rotations discourage weeds by- (i) providing a widely differing microclimate to the weeds under its canopy; (ii) refusing its parasitism by the parasitic weeds; (iii) offering intensive soil upheaving in certain cases, (iv) giving opportunity for intensive inter-row cultivation if it was a wide row crop; and frequent grazing or cutting when a suitable forage crop was selected.

How to control weeds in agriculture?

Some weed control methods are hand cultivation with hoes, smothering with mulch, and lethal wilting with high heat, and chemical control with herbicides (weed killers). And, always remember that the best time to control weeds is early in their life when they are at their weakest. When we leave a weed too long it becomes more resilient which makes it is harder to kill. Weeds have a much higher nutrient and moisture intake when they are actively growing, so when we spray at this time their intake of the chemical will be higher giving us the best results.

What is preventative weed control?

Some examples of preventative weed control can be using certified weed-free seed, only transporting weed-free hay, and screening irrigation to prevent weeds. It refers to any method that aims to prevent weeds from being established in a cultivated crop.

Can herbicides hurt crops?

Though, crops are also easily injured under these conditions. Selective herbicides must control the weeds with little or no injury to the crop. Timing and rate of application are important with chemical weed control. Spraying at the wrong time results in poor weed control and crop injury.

What is the application of chemicals to weeds called?

The application of chemicals (herbicide) to weeds is called chemical weed control . Herbicides are considered the most effective and time-efficient method of chemical methods of weed control. Some herbicides are formulated so as not to cause harm to the surrounding crops of the weed.

What insects are used in integrated pest management?

Among many insects used in integrated pest management, are a cinnabar moth, tansy flea beetle, and chrysolira beetle. Some examples of biological weed control methods are sheep to control tansy ragwort or leafy spurge, cinnabar moth, and the use of goats to control brush on rangeland. 5.

What are the two methods of weed control?

The two mechanical control techniques used are tillage and mowing. Some manual and mechanical weed control methods are pulling, cutting, and otherwise damaging plants can be used to control some weed species, particularly if the population is relatively small.

What is mechanical weed control?

Physical disruption with the use of farm equipment or through some physical actions is under mechanical weed control. The success of methods under this category changes depending on the life cycle of the target weed species. Mechanical weed control involves the use of farm equipment to control weeds.

How to control weeds in the garden?

Tilling and cultivation. Turning young weed seedlings into the soil, either by hand cultivation with a hoe or by mechanical tilling, is great for reducing the number of weeds that reach maturity. It’s one of the oldest means of weed control—after hand-pulling, of course.

How to prevent weeds in lawns?

Covering the soil with unwaxed corrugated cardboard or several sheets of newspaper before laying down the organic mulch takes weed prevention a step further and serves as season-long weed control. Plastic-film mulches are effective, too, though they’ll be headed to the landfill after a season or two of use.

What is the best way to kill weeds?

Herbicides. Although they should remain toward the bottom of your list of reactive weed-management tools, herbicides are a valuable weapon against weeds. Turning to chemical herbicides is a personal decision for hobby farmers and one not to be taken lightly.

Can flamers be used to kill weeds?

Large weeds require a lot more fuel to kill and are more likely to recover if all the tissue is not killed.”. Flamers can be used instead of cultivation and tillage after pre-germination, too, killing the resulting weed seedlings with heat rather than disturbance—a great technique for no-till, organic farmers.

Is it ok to till perennial weeds?

Cultivating or tilling established perennial weeds is seldom a good idea, though, as the process chops up the roots and propagates them. (Weeds like Canadian thistle, quack grass, knotweed and field bindweed are notorious for this.) Cultivation works best after a process called pre-germination.

Can you pull weeds after rain?

Although time-consuming, hand pulling is the perfect choice for smaller gardens and areas where other techniques are not appropriate or possible. Be sure to weed after rain or irrigation to ensure soft soil and aid in the removal of the entire weed. Leaving root pieces behind often ensures the weed’s return.

What is no till farming?

Conventional no-till farming often involves the application of chemical herbicides to kill existing weeds; seeds are then planted through the weed residues. Organic farmers and gardeners can either use organic herbicides in the same manner or top-dress planting beds with regular additions of organic matter, causing a layered, mulching effect and encouraging the resident soil life to thrive undisturbed. Both Gallandt and Sullivan remind us, though, that no-till methods tend to shift weed troubles away from annual weeds and toward perennials, which, unfortunately, may be more difficult to control in particular areas.

Why do some weeds need to be controlled?

Some weeds need to be controlled because they’re poisonous to animals , says Kevin Bradley. Perilla mint. Many animal deaths, at least in Missouri, from poison weeds involve this one. It tends to grow in shady areas and can be controlled easily with most pasture herbicides when actively growing.

When do grass weeds peak?

For instance, 43% of pasture weeds are annual broadleaves, and they tend to peak in June, July, and August. Foxtails usually emerge in July and August. 5. Simplify.

Can you use metsulfuron to control pasture weeds?

For instance, metsulfuron-containing herbicides (Chaparral) can give excellent weed control but also can suppress tall fescue yield if used in the spring.

How does pasture fertility affect weed density?

The survey correlated pasture fertility to weed density. As fertility moved closer to ideal, weed density declined. Each one-unit increase in soil pH (going from 5.8 to 6.8 pH, for example) resulted in 4,100 fewer total weeds per acre, and 2,454 fewer common ragweed plants.

Can hemlock kill livestock?

Poison hemlock. It moves from roadside ditches into pastures, says Bradley. A low rate of ingestion can kill livestock. Several herbicide options, including Grazon and Remedy, can control hemlock.

Why is weed control important in agriculture?

Conservation systems are necessary to preserve agricultural productivity and meet future global food demands. To implement these systems, adequate weed control is crucial in their success. Herbicide use has been a valuable asset when adopting conservation practices, however, prudent use of chemical weed control is essential to fulfilling the goals of conservation agriculture, reducing detrimental environmental impact, and reducing herbicide resistance development. Further development and testing of alternative weed management practices that can be utilized along with herbicide applications must be pursued in order for conservation practices to remain successful.

What is the purpose of herbicides theory and applications?

The content selected in Herbicides, Theory and Applications is intended to provide researchers, producers andconsumers of herbicides an overview of the latest scientific achievements. Although we are dealing with manydiverse and different topics, we have tried to compile this “raw material” into three major sections in search ofclarity and order – Weed Control and Crop Management, Analytical Techniques of Herbicide Detection andHerbicide Toxicity and Further Applications. The editors hope that this book will continue to meet theexpectations and needs of all interested in the methodology of use of herbicides, weed control as well asproblems related to its use, abuse and misuse.

When did herbicide resistance start?

As early as the 1950’s, shortly after widespread herbicide use began, concerns were being voiced about the possibility of herbicide-resistant weed biotypes appearing as a result of repeated exposure to one herbicide (Appleby, 2005). It was not until 1970, however, that the first case of herbicide resistance was formally documented in triazine-resistant common groundsel (Senecio vulgaris L.) (Ryan, 1970). Since that time, 346 herbicide-resistant weed biotypes have been reported worldwide and continue to demand considerable research attention to control existing resistance as well as to combat the further spread of resistant populations (Appleby, 2005; Heap, 2010).


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