What should I do if there are many weeds in the farmland? What harm do these weeds do to crops?

The weeds in the farmland are very vigorous, and they reproduce quickly and have a huge root system. The water and fertilizer capacity of the soil is very strong, and in the rural rape fields, they will compete with the rape for nutrients, thus threatening the growth and development of the rapeseed in the plot. Crops need to be photosynthesized.

The root system will be more developed, but too many weeds will inevitably block the lettuce.

of the sun. Especially when the vegetables are still relatively short, they cannot absorb sunlight and are prone to weak seedlings and yellow seedlings.

<> too many weeds can also breed various pests and diseases. Too many weeds and poor ventilation in the field create conditions for the breeding of germs, and various diseases are prone to occur. Moreover, many pests also feed on weeds, and if there are too many weeds, the more pests will absorb nutrients on both sides, which will affect the growth of crops.

It is not conducive to drought resistance, weeds, and tenacious vitality. Competitive, he will absorb most of the nutrients into himself. The impact on crops is not a small one.

The vitality of weeds is particularly strong, the rhizomes and stems are thin, and the ability to absorb water and nutrients is stronger than that of crops, so in the case of too many weeds, it will lead to insufficient nutrition of crops, affect yield, and even wilt, and it is possible that weeds will compete with crops for nutrients and water in the soil, block sunlight, and make crops unable to photosynthesize. It also affects the ventilation in the field and reduces the yield of crops.

The most important harm is to compete with crops for fertilizer, water, and light. Weeds have well-developed root systems and strong ability to absorb water and fertilizer, and crops either die due to lack of water and fertilizer, or suffer from poor growth. At this stage, fertilization water is also a problem, without crop fertilizer and lack of water, most of it is absorbed by weeds; Weeds are generally for crops, and they grow in farmland or ridges.

On the tenacious vitality, easy to reproduce, fast growth, and crops compete for nutrients, compete for living space, and spread pests and diseases, weeds have a very strong ability to survive, and the demand for water is also relatively large, and even when competing with crops for nutrition, it is more powerful than crops.

Weeds can be pulled out manually, and the biggest harm of weeds to crops is that weeds often grow very savagely, which will absorb nutrients and water in the land and reduce crop yield.

You can buy some special weeds to get in, these weeds will compete with crops for water and nutrients, will make crops not grow tall, and will also affect the harvest of crops.

Some herbicides can be applied. A lot of weeds definitely has an impact, after all, it will rob crops of nutrients, so that crops do not have enough nutrients.

You can pull out all these weeds. These weeds absorb nutrients from the crops, making the real crops not particularly good because they are malnourished.

The weeds in the field should be removed as soon as possible, these weeds will absorb the nutrients in the soil, which will make the crops grow poorly and will not have a good harvest.

When there are often a lot of weeds in the farmland, they must be pulled out in time, otherwise it will affect the growth of the farmland and the entire harvest.

Most of the crops in the farmland are monocots, and the weeds are mainly dicots. Generally dicots have two or more cotyledons, whereas monocots have only one cotyledon. Weeds are characterized by:

The new weeds spread rapidly, the sporadic weeds gradually became the main weeds, and the resistance of common weeds increased. According to the external morphology of weeds, they can be divided into broad-leaved weeds, grasses and sedge weeds. Broad-leaved weeds are further divided into dicotyledon broad-leaved weeds and monocotyledon broad-leaved weeds.

Poaceous weeds mainly include weeds such as barnyard grass, dogtail grass and reeds. The weeds of the sedge family mainly include cow felt, water sedge and other weeds. According to the life history classification of weeds, they can be divided into annual weeds and perennial weeds.

Annual weeds can only reproduce by seeds, and perennial weeds can reproduce by both seeds and underground vegetative reproductive organs.

Common farmland weeds are: Polygonaceae Siberian knotweed, Polygonaceae knotweed, Polygonaceae red knotweed, Polygonaceae red knotweed, Polygonaceae Erythrophyllum chinensis, Chenopodaceae quinoa, Chenopodaceae quinoa, Chenopodaceae Versaed, Chenophoraceae Diskin, Malvaceae wild watermelon seedlings, Chenopodaceae quinoa, Caryophyllaceae chickweed, Caryophyllaceae Miwa pot, Spindle leaf petunia, Spiral family round-leaved petunia, Cyperaceae firefly, Cyperaceae heteromorphic sedge, Cyperaceae water sedge, Cyperaceae fragrant aconite, Cyperaceae cow felt, Cyperaceae flattened stalk, Pentaceae ivy, Amaranth Qingxiang, Amaranth concave head, Amaranthaceae

The growth of farmland weeds is not conducive to the growth of grain, and farmland weeds compete with crops for fertilizer, light, water and space. Farmland weeds can also reduce crop yield and quality, as well as cause pests and diseases.

with herbicides. There are too many kinds of weeds in paddy fields, which are resistant and difficult to control, and if you want to solve the problem of many weeds in paddy fields, you can solve it by choosing appropriate herbicides.

Let's first learn about the types of weeds, as the so-called knowing oneself and knowing the other is invincible, there are many weeds in paddy fields, including broad-leaved grass, spike grass, sedge, etc. Weed occurrence is different in different regions, and weed resistance is also different. Therefore, there are some great difficulties in the control of rice growers.

Common broad-leaved weeds in paddy fields include: wild cucumber, ducktongue grass, panicle, lotus seed grass, eye grass, etc. Common sharp-leaved weeds in rice paddy fields are:

Barnyard grass, Qianjin, double-spike barnyard grass, horsetail, cow vein grass, barberry, dogtail grass, etc. Common sedges in rice fields include: triangular grass, sweet aconite, etc.

Currently, there are not many herbicides on the market specifically for rice, including benzethuron-methyl, pyrisulfuron-methyl, dimethyl tetrachloride, chlorofluoropyridoxetacetic acid, and methadone for broadleaf weeds. Herbicides commonly used in sedges include dimethyl tetrachloride, pyrazolon, methoxoxide, etc.

In the process of weeding, we should also pay attention to the following three points:

Spraying cycle Different herbicides and herbicides produced by different manufacturers are different (processes), there will be differences in the trial period, some can be used on rice leaves, and some need to wait for 3 leaves to start using, but no matter which herbicide, it is too late, it is not recommended or affect the weeding effect, when they buy herbicides, there are instructions on the label.

Spraying insecticide temperature When the herbicide efficacy is good or bad and the use of temperature also has a certain relationship, if the temperature is too high, more than 35 degrees, the evaporation rate is fast, the weed absorption solution is limited to the herbicide, the weed control effect will be reduced, if the temperature is too low, it is easy to cause the phenomenon of rice damage, if the rice planting area is large, spray dioxaether, the temperature is lower than 15 degrees, not only the efficacy is reduced, the rice is also susceptible to drug damage.

Pesticides should also pay attention to the method of spraying, seemingly simple but knowledgeable, spraying insecticides: the correct operation of the drug also plays a positive role in the efficacy of the drug, one is not to spray and miss the spray, re-spraying is easy to cause injury, the leakage spray can not play a weeding effect; Second, it is recommended to dilute the medicine twice to prevent the unevenness of the liquid medicine in the medicine barrel. Third, do not spray herbicides in windy weather; Fourth, apply herbicides, don't dry the fields too much, etc.

The above are tips and trivia about getting rid of weeds in the rice field, I hope it can help you.

There are too many weeds in the paddy field, this should be done, the weeding of the rice seedling field is flat in the seedbed, the soil is evenly covered, and the seedling field with moderate moisture can be closed and weeded, with the use of pesticides; At present, the chemical weeding technology of rice transplanting field mainly adopts closed weeding, and prochlor is mixed with broad-leaved weeding herbs at the green grass leaf stage 3 to 5 days after rice transplanting.

Some herbicides can be used appropriately, so that some grasses can be better removed and the rice field can be better grown.

It should be done by hoeing, herbicides can be used, or weeding can be done manually.

Fallow If weeds grow during this period, will the soil recover? Obviously, this is not possible at this stage. Fertility can be restored by dead weeds or planted green manure crops that can be cultivated into the soil to restore fertility.

Farmland fallow is a policy issued by the state to allow for the sustainable development of farmland in the country, improve soil health and increase the content of soil organic matter. So many people think that arable land is left fallow in order to fill the land with weeds, but this is not the case.

A more reasonable approach is to grow green fertilizer crops, such as rapeseed, to break the straw into the soil after harvest or before it is ripe, and to allow the straw to rot in the arable land. Through the nutrients rich in organic matter, protein, cellulose, sugar and other nutrients in green manure crop straw, decompose and release nutrients that are conducive to soil health, so as to achieve the purpose of improving soil fertility, increasing soil organic matter and soil microorganisms. and the number of creatures in the subterranean.

Crop rotation and fallow is an important measure proposed by China to protect land fertility and achieve sustainable agricultural development. Now, many rural areas have begun to rotate crops and fallow. It is understood that this year's rotation area fallow has doubled from last year's 12 million mu rotation area fallow to 24 million mu.

The so-called fallow does not actually mean abandoning farming, but planting plants that can restore fertility, rather than growing crops in designated areas. We can also understand that the ultimate purpose of fallow is to reduce the use of fertilizer so that the plants in the fallow field can fertilize themselves, thus improving the fertility of the land.

Crop rotation fallow is due to the overuse of the soil in the past, and the use of a large number of pesticides and fertilizers has greatly reduced the fertility of the land. In serious places, there are problems such as groundwater subsidence and heavy metals exceeding the standard. The land gradually lost its ability to arable land.

The purpose of passing fallow is to give the land a "rest" time so that they can slowly regain the cultivation capacity of the land on their own.

Improving land fertility is a relatively slow process. A year not only increases the fertility of the land, but also costs fallow. In some places, such as the places where the above-mentioned heavy metals seriously exceed the standard, saline-alkali land, etc., the fallow time may be longer, such as two years, three years.

No. These weeds suck up nutrients from the soil and do not become nutrients.

Of course, these weeds do not become nutrients, but compete with crops for nutrients in the soil.

A: These weeds don't become nutrients, instead, they rob crops of nutrients.

Weeds are actually the sum of all green plants that are not crops, including weeds in the field and weeds in the wild. The rational and effective use of weeds and turning waste into treasure has always been an important measure for the accumulation of organic fertilizer in rural areas. In the process of growth, weeds absorb a certain amount of soil minerals, and the nutrients accumulated by plants mainly come from photosynthesis, that is, the use of solar energy and carbon dioxide in the air, as long as it does not affect the photosynthesis of crops, is also an important fertilizer**, which fully demonstrates the feasibility and effectiveness in the practice of symbiosis between orchards and grasses.

Weeds refer to plants that are harmful to human survival and activities. They are usually uncultivated wild plants or plants that are useless to humans. The concept of weed is relative.

Manual weeding in the field is a very effective method of weeding, farmers mostly weed in the field, although the method is a little hard, but safe, no pollution, and the effect is very good, suitable for farmers in a small area, or if there are a small number of malignant weeds in the field. Weeding with animal or mechanically powered towed weeders. In general, mechanical raking and soil mulching are carried out before crop sowing, after sowing, before seedling stage, and seedling stage to control the occurrence and damage of weeds in farmland.

This is highly efficient and low labor intensity. However, its disadvantage is that it is difficult to remove weeds between seedlings.

Chemical weeding is efficient, timely, labor-saving and economical, and is suitable for modern agricultural production and management. It is conducive to the popularization of the application of no-tillage method and less tillage method, realizing direct cultivation of rice, and reasonably improving the density planting degree and multiple cropping index. Generally, it is possible to prevent the occurrence of other weeds by planting a kind of weed, and the planted weeds are not ordinary weeds, it is a vegetatively reproduced weed, which does not grow high, and has little impact on the growth of fruit trees.

The main hazard of weeds is to compete with crops for nutrients, water, sunlight and space, hindering ventilation and lighting in the field, thereby reducing crop yield and quality; Many weeds act as intermediate hosts or host sites for pathogenic microorganisms and pests, leading to the occurrence of diseases and pests. Farmers should improve the quality of land preparation, rational operation and fertilization, strengthen the prevention and control of diseases and pests at the seedling stage, promote wheat seedlings, strengthen seedlings, and homogenize seedlings, and improve the competitiveness of wheat against weeds.

With crops as fertilizer, light, water, space, and weeds have developed root systems, and can also take root, and the internode absorption capacity of creeping on the ground is strong, the growth rate of seedlings is fast, the photosynthetic efficiency is high, and the photosynthetic products are rapidly distributed to the new leaves, and the nutrients grow to the reproductive growth rapidly, and have the special properties of interfering with crops, and their ability to capture water, nutrients and sunlight is far greater than that of crops. It has excellent growth characteristics and excellent environmental adaptability. To reduce the damage of weeds, wheat oil, wheat and vegetable rotations can be carried out.