There are many kinds of weeds in crop fields, what should be done?

Today next year is the first anniversary of your graduation, and you all come here and tell you the answer. It's been the first anniversary, and the students came and saw that crops had been planted in the field, and everyone understood the answer. The best way to keep grass from growing in the field is to plant crops in the field.

Today next year is the first anniversary of your graduation, and you all come here and tell you the answer. It's been the first anniversary, and the students came and saw that crops had been planted in the field, and everyone understood the answer. The best way to keep grass from growing in the field is to plant crops in the field.

Most of the herbicides <> single or some grasses can not be killed, and the symptoms are not cured, but above the surface, underground roots, the roots do not have an effect, and they will still grow in the next year, over and over again! But this will not be the case with manpower, no matter what tools are used, with glylylam, with water spraying.

If it is ploughing, the plough and rake can be repeatedly turned over and over again, so that the grass roots are exposed to the sun and died. I suggest that you use manual hoeing or small rotary tiller to solve the problem, which can not only remove weeds, but also reduce the cost and input, can prevent soil compaction, increase drought tolerance, directly remove roots, if the ground can also increase soil organic matter. Crop hoeing, scientific management, according to local conditions, part of the Chinese herbal medicine planting, hoeing must think twice, in the general situation in the countryside in the crop to do an experiment, half a month after observation can be used, a mistake is not shallow.

For these weeds when the current temperature is lower than 15 degrees, 200g of 46% glyphosate isopropylamine salt, or 200g of 41% glyphosate isopropyl potassium salt mixed with 15kg of water, and 400g of medicine per mu mixed with 30kg of water can be sprayed and weededed. If there are bowl flowers growing in the ground, I don't recommend that you use chemical herbicides. Because either food or vegetables are grown in the farmland, chemical herbicides can form residues in these crops.

It is not safe to eat it either by itself or by **. The fastest way to get rid of the grass on a piece of land is to pick up a hoe and hoe non-stop. There are two kinds of hoes, the one with a narrow mouth is called a big hoe, and the one with a wide mouth is called a hoe.

If you want to hoe quickly, use a hoe with a wide mouth to hoe.

There are different measures, the first one is to go to the weeds in the river fields and pull them out one by one. However, this method is not very preferable, because the time consumed is large, and the amount of labor is also large, unless the planting amount is very small, so this method is generally not adopted. The second option is to spray pesticides.

Due to the presence of a wide variety of weeds with different biological characteristics in crop fields, it is not possible to use a single method to control them. This should be based on the characteristics and occurrence of weeds, the use of advanced and economical control measures.

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.

Need to be removed, weeds need to be constantly removed, to prevent pests, use some insect repellents, weeds can cause plants to be infected with diseases, lead to plant death, seriously affect the growth of plants, lack of nutrients.

Using manual weeding, you can pull weeds by yourself, or you can use herbicides, which will affect the quality of agricultural products, affect the harvest, affect the normal growth of agricultural products, and affect the nutritional intake of agricultural products.

We can use herbicides to get rid of these weeds. It affects the yield of crops, affects the growth of crops, affects the taste of crops, and grabs water and nutrients with crops.

Methods of eradicating or spraying pesticides with hoes; Weeds can affect the normal absorption of nutrients by crops, and can also block the sunlight and air needed by crops, leading to an increase in pests in crop fields.

Weeds are manually disposed of before they form seeds. Removing the weeds in the field with a rotary tiller or hoe can be reduced in the coming year.

Before sowing, the plough is rotated, the soil is turned deeply, the weed seeds are exposed, and after a few days of drying the soil, it loses its germination ability.

There are many functions of plastic film, such as water retention, temperature increase, improve fertilizer conversion and utilization, and control of underground pests, especially black plastic film, black and white plastic film, etc., the weeding effect is good, and it can be used continuously.

Biocidal herbicides can be used, but care must be taken to protect crops during the use process, and the pesticides must not be sprayed or drifted to crops, such as glyphosate, paraquat, glufosinate, etc.

Weed seeds have strong adaptability, the seeds of general weeds can be kept in the soil for about three years, and some weed seeds with thick skin can stay in the soil for more than 5 years, and still have germination power, so the weeds in the crop field, if they are neglected for a year, the seeds of weeds can not be removed in the field for several years. Weeds have strong adaptability, we are obvious to all, no matter how bad the environment outside, we can always see weeds growing, roadside, can not grow crops, tile cracks, stone crevices, etc. may grow weeds, weeds are also trying their best to spread their seeds, some weed seeds are eaten by birds, birds can not digest, excreted out, so they spread the grass seeds, grass seeds can be spread with the help of wind, water, animal activities, human labor, etc. To say that the control of weed seeds in the crop field, at present, the method of spraying herbicides is generally used, and the pre-budding herbicides have played a great role and are the main force of weeding.

However, with the application of herbicides, the disadvantages are recognized, and herbicides combined with manpower to improve the effect of weeding.

Be sure to spray insecticides in a timely manner, and turn the soil appropriately. High-temperature cautery can be used, which is very effective.

<> The relationship between crops and weeds is competitive. The relationship between organisms and organisms mainly includes pre-predation and feeding relationship, competition relationship, cooperative relationship, and symbiotic relationship, while crops and weeds will compete with each other for sunlight, water, nutrients and survival, so they belong to the competitive relationship.

Pests that are not suitable for the use of clean fields and weed removal are.

The weeds and medicinal plants in the pro-cultivated field are often hidden and wintering places for pests and diseases after harvest, and they become slow and stupid for the next year's pests and diseases. Therefore, weeding and pruning can greatly reduce the degree of pest damage and reduce the overwintering base of pests and diseases. For example, the prevention and control of wolfberry black fruit disease is mainly to focus on cleaning the countryside in winter.

After the fruit is harvested in autumn, the black fruit on the tree is completely removed and the diseased branches are pruned, and the dead leaves and black fruits of the dead branches and black fruits on the ground are all removed, and burned or buried deeply. In this way, a large number of pathogenic bacteria are eliminated, the incidence base of spring fruits in the coming year is greatly reduced, and good control effects can be obtained. According to the results of the survey in the production disturbance area, the incidence rate in mid-July was good for the garden, bad for the garden, and not for the garden.

For example, when the sand cucumber is harvested, it is the time when the sand cucumber borer is about to form a cocoon and become a pupal stage, and the larvae in the residual plant are scalded by using the scalding water to reduce the damage of the next generation.

For weeding in wheat fields, it is necessary to choose the appropriate herbicide, and pay attention to the timing, use it according to the specifications as much as possible, avoid mixing with other fertilizers, and effectively understand the relevant decomposition ability of wheat to such herbicides.

Be sure to pay attention to the time of spraying herbicides, but also pay attention to the choice of type, pay attention to the temperature when spraying, and try not to let the average daily temperature fall below 8 degrees. Don't spray too much at a time.

It is necessary to pay attention to the selection of herbicide varieties, spraying in the best period, carrying out secondary dilution, spraying at a suitable temperature, wheat herbicide not only has strict requirements for the use period, but also strict on temperature requirements, the temperature is too low, wheat metabolism is slow, and the dose of weed absorption will also be reduced, and it is easy to cause pesticide damage, therefore, spraying wheat herbicides, must be selected in the morning on a sunny day with a temperature of more than 10, and the herbicide should not be lower than this temperature for 3 days before and after. In order to achieve the ideal weeding effect.