What plants are not prone to grow weeds around them

This phenomenon is called "heterogenetic", which is now known as plant allelopathy. It refers to the phenomenon that the secondary metabolites (allelopathic compounds) produced by plants inhibit the growth of other plants through information during plant growth, and the phenomenon of developing and eliminating them is called heterogenetic. Plants release chemicals mainly from roots, stems, leaves, flowers and residues, and the release methods include secretion, volatilization, rainwater washing and residue decay.

Heterophytology is prevalent in nature, with some plants influencing other plants through organic compounds secreted by their roots. For example, a hormone secreted by pine roots can inhibit the growth of birch, and the exudation of elderberry roots can also inhibit the growth of poplar. It was also found that apricot seedlings were sown in the nursery land where the previous crop was poplar; Not only is the growth decreased, but some of the seedlings withered and died, while the rich aromatic roots of acacia and Australian myrtle promoted the growth of peas and broad beans.

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Plants with well-developed shallow roots, as well as evergreen plants with a wide and dense canopy, such as ficus microphylla and camphor trees.

There are also plants that can secrete inhibitory hormones in vitro, such as fast-growing eucalyptus.

Weeds are not easy to grow around them.

1. Weeds compete with lawns, hedges, flowers, and trees for light, water, and fertilizer. Weeds have a large root system and strong ability to consume water and fertilizer, and weeds grow more and more vigorously after absorbing more nutrients, and the growth of garden plants is becoming weaker and weaker.

2. Weeds are the intermediate hosts of diseases and insect pests. Due to the vigorous vitality of weeds, many of them are perennial or perennial plants, so pathogens and pests often parasitize or overwinter on weeds first, and then harm garden plants after they return to green.

3. Weeds encroach on the upper and underground part of the space, affect plant photosynthesis, and interfere with the growth of garden plants The number of seeds of weeds in production far exceeds the sowing amount of garden plants.

4. Affect the ornamental nature of the garden landscape. After the occurrence of weeds, the effect of the garden landscape as a garden that is appreciated by people will be greatly reduced, and it will lose its due ornamental value.

5. Affect water conservancy facilities. If some irrigation and drainage ditches are overgrown with weeds, the flow of water will slow down, sediment will accumulate, and provide conditions for rodents to roost, causing damage to the dams. During the flood of '98, many ditches were overgrown with weeds, which blocked the flow of water, resulting in extensive damage.

6. Affect the health of humans and animals. The seeds or pollen of some weeds contain toxins that can poison humans and animals. For example, if the seeds of poisonous wheat are mixed with wheat, people who eat flour containing 4% poisonous wheat will be poisoned or even killed, and if they eat soybean processed products mixed with a large amount of Xanthium fungus, they will also cause poisoning, and oleander will be poisoned after being eaten by livestock.

7. When the weeds are seriously harmed, the lawn and seedling hedges will grow weak or even die, and the replacement cycle of garden plants will be shortened.

8. Increase the cost of production and maintenance management. The control of weeds requires a lot of manpower, material resources and talents.

9. Hindering the development of entertainment activities and sports events. The occurrence of weeds affects the uniformity of garden plants, such as the occurrence of more weeds on the lawn of the football field, which will greatly affect the smooth development of sports events.

Weeds compete with crops for nutrients, water, sunlight and space, preventing ventilation and light in the field, thus reducing crop yield and quality; Many weeds are intermediate hosts or shelters for pathogenic microorganisms and pests, which can lead to the occurrence of diseases and pests.

When weeds are overgrown, farmers generally use herbicides to get rid of the weeds. The long-term monolithic use of herbicides has led to changes in the weed community in the field and an increase in the number of refractory populations. In addition, weed resistance is developing rapidly, and the overuse of herbicides is serious.

A number of weed biotypes have been found to be resistant to some chemical herbicides in China.

When one herbicide is used for a long period of time, the resistance of weeds increases gradually, which will cause farmers to multiply the amount of herbicide used, creating a vicious cycle. In addition, herbicides have a certain amount of ***, which will cause a lot of harm during use.

Weeds generally grow in farmland or ridges, and are tenacious and easy to reproduce. If the prevention and control is not timely, it will have a certain impact on agriculture. So, what are the dangers of weeds to crops?

obstruction of agricultural operations; compete with crops for fertilizer, light, water, and space; reduced crop yield and quality; pest and disease pests; affect the health of humans and animals; Affect water conservancy facilities and river navigation.

1.Hindering plant growth If weeds grow too vigorously, they will hinder the growth space of plants, and some weeds will even secrete exclusive substances that hinder plant growth, which cannot be left unattended.

2.Competing plant growth factors Weeds have a strong growth potential, and will compete with the main plants for water, nutrients and light, like vine weeds, will entangle the growth of plants, rob the light of the original plants, and cannot be removed!

3.Signs of pests and diseases Many growers will only focus on the plants they have cultivated with their hearts, but turn a blind eye to weeds, and if the weeds on the side are infected with pests and diseases, they are often ignored, resulting in the spread of pests and diseases to the cultivated plants, and it is often too late to find out.

Weeds love water and fertilizer.

The more fertile the land, the faster it grows, and the greater the need for water and fertilizer.

Too many weeds affect yields and cause plants to be thin and not stout enough.

<> manual uprooting: Manually uprooting or uprooting weeds with the help of tools such as small hoes.

Physical mulching and weeding: mulching film, straw, etc. on the land, so as to inhibit the growth of weeds and achieve the purpose of weeding.

Drug weeding: Commonly used herbicides are glyphosate, glufosinate-ammonium, etc., which are suitable for the situation that weeds are too dense.

Sprinkle lime for weeding: After removing weeds, sprinkle lime on the ground and turn the soil frequently, which can effectively prevent the growth of weeds.

1. How to make weeds never grow

In the natural environment, it is almost impossible to want the land to never grow weeds, what growers need to do is to reduce the occurrence of weeds and reduce the harm of weeds, the common measures are as follows:

1. Manual removal.

As long as you see that weeds have a "tendency to pop up", you should start by manually weeding or uprooting the weeds with the help of tools such as small hoes. Pay attention to the fact that the uprooted weeds should not be piled up in the field or plot, so as not to "resurge" the roots of the weeds when they touch the soil.

2. Physical mulching and weeding.

Mulch the land with mulch film, straw and other mulch. Mulch can not only increase the soil temperature, the high temperature environment is not suitable for the growth of weeds, but also reduce the sunlight or air of the covered land, thereby inhibiting the growth of weeds and achieving the purpose of weeding.

3. Drug weeding.

Drug weeding is generally used when weeds are too lush, and commonly used herbicides are glyphosate, glufosinate-ammonium, etc. Their weeding effect is relatively good, they can die roots, and the weeding control time is up to 20-30 days, and they still need to be used as a pre-juvenillator to control the growth of weeds in the later stage.

4. Sprinkle lime for weeding.

First remove the original weeds from the land, then sprinkle the land with lime and turn the soil frequently, which can effectively prevent the growth of weeds. Lime can destroy and corrode the nutrients in the soil that are suitable for grass growth, and it is suitable for the situation that the land is not used for planting.

5. Weeding tips.

Splash the brine of pickled duck eggs or pickles on the weeds during the weed season, usually 3-4 times to stop the growth of weeds. In addition, bleach powder water and boiled potato water can also achieve good weeding results.

2. What are the varieties of weeds?

There are more than 300,000 species of plants named in the world, more than 8,000 species of plants identified as weeds, more than 36,000 plant names can be found in China's books and periodicals, and more than 1,200 kinds of plants identified as weeds in 119 families, and common weed species are as follows

1. Broad-leaved weeds: Artemisia annua, Capsule, Pig Disaster, Lacquer, Xanthium, Mother-in-law, Mai Jiagong, Wheat Bottle Grass, Quinoa, Small Thistle (Thorn Cabbage), Large Thistle, Flat Storage, Cow Chickweed, Wang Buliuxing, Baogai Grass, Wild Old Stork Grass, Mud Herb, Tongquan Grass, Snakehead Grass, Big Nest Cabbage, Hollow Lotus Seed Grass, Iron Amaranth, Nightshade, Lantern, Purslane, Duck Plantar Grass, Amaranth Retroflexus, Carp Intestine, Humulus and so on.

2. Poaceous weeds: finch wheat, knotted wheat, Qianjinzi, Kanmai Niang, wild oats, hard grass, early maturing grass, mushroom grass, dogtail grass, cow tendon grass, barnyard grass, horse tang, etc.

3. Cyperaceae weeds: capitate sedge, mango broken rice sedge, triangular grass, special-shaped sedge, fragrant aconite, etc.

In terms of plant growth characteristics, trees belong to the tall tree layer. Weeds, on the other hand, belong to the low surface vegetation layer. There is no obvious competition between the two for sunlight and moisture.

Therefore, if you want to suppress weeds without affecting the tree, it is best to choose a shrub plant with a height in between. On the one hand, shrubs do not affect the light of tall trees**. On the other hand, shrubs can effectively control sunlight exposure to the surface, which prevents weeds from getting more sunlight.

Nature can suppress weeds through competitive relationships.

Difficult, generally local weeds are more advantageous, and bamboo forests generally do not grow grass.

Medication is required.

Removal method. 1.Phytosanitary.

That is, the crop seeds and seedlings transported between the international and domestic regions are inspected and processed to prevent the long-distance spread of new alien weeds. This is a preventive measure, which is ineffective against close-range cross-transmission and must be supplemented by measures such as net selection of crop seeds, cleaning of farm tools and ditches, and application of decaying manure to reduce the base of weed occurrence in the field.

2.Manual weeding.

This includes hand-pulling weeds and using simple farm tools to remove weeds. It consumes a lot of energy and has low work efficiency, so it cannot be prevented in a large area in time. At present, other measures are used to control weeds as an auxiliary means to remove local residual weeds.

3.Mechanical weeding.

Weeding implements that use animal power or mechanical power traction. Generally, mechanical tillage and soil covering are carried out before sowing, after sowing, before or at the seedling stage to control the occurrence and damage of weeds in farmland. High ergonomics and low labor intensity.

The disadvantage is that it is difficult to remove weeds between seedlings, not suitable for intercropping or dense planting conditions, and frequent use can also cause soil compaction in the cultivated layer.

4.Physical weeding.

Use physical factors such as water, light, and heat to control weeds. For example, the use of fire fire method for weeding, flood control and control of xerophytic weeds, with dark plastic film to cover the soil surface shading, to increase the temperature of weeding, etc.

Solanum nigrum (scientific name: Solanum nigrum L.). ）

annual herbaceous plant, whole grass 30-120 cm tall; Stems erect, multi-branched; ovate or heart-shaped leaves alternate, nearly entire; In summer, small white flowers are bloomed, 4 to 10 into umbrella inflorescences; Spherical berries, blackish-purple when ripe. Both the berries and the leaves are edible, but the leaves contain a lot of alkaloids and must be cooked before they can be detoxified. The whole plant can be used as medicine, which can disperse stasis and reduce swelling, clear heat and detoxify.

It is distributed in almost all of China. Born on the edge of the field, in the wasteland and near the village. It is widely distributed in temperate to tropical regions of Europe, Asia and the Americas.

Chickweed aliases: goose intestines, goose ear tendons, chicken intestines, Latin name: Stellaria Media (L

cyr.Caryophyllaceae, chickweed is an annual or biennial herb with a height of 10-30 cm. The stems pitch or rise, more or less branched at the base, often pale purplish-red, covered with 1 (-2) rows of hairs.

Leaves broadly ovate or ovate, apex tapering or acute, base tapering or nearly heart-shaped, entire; The basal leaves are long-stalked, and the upper leaves are often sessile or short-stalked. sparse umbrella inflorescence apical; peduncle weak, capsule ovate, slightly longer than the calyx, apex 6-lobed, with most seeds; The seeds are ovate to nearly round, slightly flattened, reddish-brown, millimeters in diameter, with hemispherical nodulous protrusions on the surface, and the ridges are more prominent. The flowering period is from June to July, and the fruiting period is from July to August.

Scientific name in Chinese. Chickweed Latin scientific name.

stellaria media (l.) cyr.

Another name. Goose intestine vegetables, goose ear tendons, chicken intestines,

You're on Chickweed.

Weeds refer to plants other than purposeful cultivated plants. For example, all grasses growing in tree holes and flower beds and other grass species growing in lawns other than lawn grass species are called weeds. For example, white clover is an excellent broad-leaved grass species, but it is a weed in the grass lawn such as knotweed and grass grass.

Broadleaf weeds are also known as dicot weeds:

The embryo has two ** leaves, herbaceous or woody, the veins are reticulated, the leaves are broad, and there are petioles. Although duck plantar grass is a monocotyledonous weed, people are used to classify it as a broad-leaved weed. According to the length of its life, it can be divided into annual weeds and perennial weeds.

Annual broadleaf weeds are propagated by seeds, germinating to a depth of 0-5 cm in the soil; When herbicides are controlled, germinated weeds in shallow soil can be effectively controlled, such as quinoa, amaranth, camelina and wild watermelon seedlings. For the weeds germinating in the deep soil layer, because the seeds are below the medicine layer, it is difficult to control the herbicides with soil surface treatment, such as Xanthus, duck plantar grass, hemp, etc.

Poaceous weeds: It is the main weed in paddy fields and dry fields, the embryo has a cotyledon (seed leaf), usually the leaves are narrow, long, the leaf veins are parallel, there is no petiole, the leaf sheath is open, there is a leaf tongue, the stem is round or flattened, and there are nodes and internodes hollow. This type of weed is both annual and perennial.

The germination depth of the larger seeds in the soil can reach more than 5 cm, and it is difficult to control herbicides on the soil surface, such as wild millet and double-spike paspalum.

The main weeds of gramineous grass in wheat fields are: wild oats, finch wheat, knotty wheat, wheat lady, Japanese wheat lady, barnyard grass, early maturing grass, dog tail grass and so on. Lawn grass weeds are horsetail, cow tendon grass, two-eared grass, dogtail grass, white spear grass, finch wheat and so on.