What are the control problems of rice weeding? And how to effectively reduce the weed population bas

You can save some weed-control cloth, you can save some herbicides, you can also use some insecticides, you can pull them out frequently, and you can also carry out ** on the soil. Techniques to reduce weeds can be done in the same way.

The way of weeding, how does the process of weeding not harm rice, and how does it not affect other crops in the process of weeding? Will it pollute the water source? When reducing weeds, you need to remove them manually first, and then consider other methods.

After the rice seedlings grow to a certain extent, select a certain number of ducks to put into the rice field, remember not to exceed the saturated number, and the ducks can be effectively weeded by swimming in the rice field.

First, no closure, no live broadcast! Everyone knows that planting direct seeding rice is directly seeded into the ground, and there are no stems and leaves, so foliar spray weeding will not work. Planting direct seeding rice must be closed with pesticides for weeding, which is simple and brutal and effective! So no closure, no live streaming! Clause.

Second, weeding should be adapted to local conditions Direct seeding of rice field weeding should be adapted to local conditions, some growers are newly reconstructed, generally within three years of new weeds in rice fields, generally using two times of closed medicine can basically control the grass; More than three years belong to the old land, and there are generally more weeds in the old land, so the old land is generally used three times of sealing medicine. In this way, after three times of medicine, the weeds in the live broadcast field are basically gone.

The most environmentally friendly way is to weed by hand, and the simpler way is to use pesticides.

1. Herbicides are classified according to their mode of action.

1. Systemic herbicides.

Some herbicides can be absorbed by weed rhizomes and leaves separately or at the same time, transported to all parts of the plant body through the conduction tissue, destroying its internal structure and physiological balance, thereby causing plant residue death, this way is called systemic herbicide, herbicides with this characteristic are called systemic herbicides, such as 2methyl4chloride, glyphosate can be absorbed by the stems and leaves of plants, and then move to all parts of the plant, including underground rhizomes, so glyphosate can prevent annual weeds, but also effectively control perennial weeds.

2. Contact herbicides.

Some herbicides are sprayed on plants, which can only kill the part of the plant tissue that is in direct contact with the agent, but cannot be internally conducted. This type of herbicide can only kill the aboveground part of the weed, and has a poor effect on the underground part of the weed or perennial weeds with underground reproductive organs, such as herbicidal ether, sodium pentachlorophenol, etc.

The use of herbicides can kill weeds in the field in a timely and effective manner, which has the advantages of labor saving and high efficiency. However, if it is not used properly, it will cause pesticide damage, which will hurt the seedlings and inhibit the growth: the heavy will kill the seedlings and the particles will not be harvested.

The common weeds in the paddy field in Linxiang District include cow felt, water sedge, dwarf cigu, knotweed, heteromorphic sedge, eye cabbage, Qianjinzi, water amaranth, Tianzi apple, cizao, black algae, Mo Shangcai, etc. In order to control weeds in time, different herbicides are used according to the seedling raising method.

1.Weeding in moist seedling transplanting fields. Apply pesticides after planting.

In the transplanting field mixed with barnyard grass, sedge, broad-leaved grass, 5-7 days after transplanting, with 5 butachlor EC, 18 Kecaocarb wettable powder, 14 straw phobia wettable powder, 22% benzyl (wild old) wettable powder, 15 Lecaolon wettable powder, 96 Grass strong emulsifiable concentrate, etc., should have a shallow water layer to maintain for 5-7 days when applying pesticides, do not use the outflow of medicine, pay attention to the seedling transplanting field, sandy field, leaky field and so on.

2.Dry seedlings, weeding in seedling fields, 100-150 grams of 25% benzyl fine granules or 10 grams of 20% benzyl B wettable powder per mu are used for 7 days after throwing seedlings, and after the seedlings take root and stand seedlings, mix 10 fine soilk or urea 10?

K + KCl? k Spread evenly. Maintain 3?after application

m 5-7 days in shallow water layer, pay attention to the water should not submerge the heart of the seedling; Or 10-16 days after planting (2 leaves of barnyard grass), drain the water, make the weeds expose the water surface, spray with 40-50 grams of 36% dichlorobenzyl, rehydrate one day later, and keep the water layer 3-5m。

Now the cost of farming has increased, profits have decreased, and the consequences of using the wrong medicine are even more unimaginable, so we must be cautious and cautious when buying pesticides. The prevention and control of resistant barnyard grass (green barnyard grass, red stem barnyard grass, paspalum, bald barnyard grass, etc.), resistant horsetail, resistant jacks, lily grass, dog tail grass, in the seedling 2 leaves and 1 heart stage, until the weed aging, it is recommended to use the "barnyard chopping" spray control. The larger the grass, the more the concentration of the herb increases.

Avoid too low temperature and high temperature medication, the efficacy is good, not **, and the safety of seedlings is very high. Hope it helps.

Broad-leaved grass: wild cucumber, triangular grass, shallots, water cabbage, etc. can be used in "He Raiders".

The occurrence law of weeds in paddy field is generally that weeds emerge one after another after sowing or transplanting, and the first weed germination peak occurs 7 to 10 days after sowing or transplanting, mainly grasses such as barnyard grass and goldenrod and annual sedge weeds such as heteromorphic sedges. A second peak of germination occurs about 20 days after sowing or transplanting, mainly sedge weeds and broadleaf weeds. At the same time, because the herbicide varieties in paddy fields are mainly soil treatment agents, the control of weeds in paddy fields should be based on early medication, except for the control of broad-leaved weeds such as bendasone and dimethyltetrachloride sodium salt and a few stem and leaf treatment agents such as propanus and dichloroquinolic acid, which are generally required to be used before the 3-leaf stage of weeds, and it is easy to receive a better control effect. However, in specific cases, it is necessary to comprehensively consider the characteristics of the herbicide itself and the growth period of rice, such as general butachlor, prochlor, salphos, and <

Herbicides such as oxamine and tetrazoolachlor are absorbed through young roots and shoots, and can only be used at the stage when weeds have just germinated or are seedlings of barnyard grass; Herbicidal pine, propanny, pyrimidine oxidine ether, cyanofluoxate, etc. can only be treated with stems and leaves at the adult stage of weeds; The herbicides that can be absorbed by weed roots, stems and leaves include grass dichloride, grass dan, dichloroquinolic acid, etc., which can be used for soil treatment and stem and leaf treatment in the later stage. The sensitivity of rice to herbicides at different growth stages was also different, such as the sensitivity of rice to grass and tetrazoloylamide at the young bud stage; Rice was sensitive to dichloroquinoline acid before the 2nd leaf stage; In the peak tillering period of rice, 2 methyl 4 chloride and so on cannot be used.

Although weedy rice makes farmers hate it to the core, there is nothing they can do. Some rice farmers said that weed rice and cultivated rice are like a pair of twins, it is indeed difficult to distinguish without a pair of sharp eyes, and after the rice seedlings emerge, there is no herbicide that effectively controls weeds and rice, and the most effective control method is to manually pull out at the tillering stage, but it is very time-consuming and inefficient.

Although there is no complete method for weedy rice in various countries, experts believe that the establishment of a three-dimensional scientific prevention and control system can effectively control the occurrence and harm of weed rice: first, increase scientific research, and relevant national ministries and commissions should attach great importance to the harm of weed rice, and study its occurrence mechanism and prevention and control strategies; The second is to improve the cultivation method and destroy the living conditions of weed rice, which can be changed to transplanting planting for direct seeding rice, no-tillage planting of wheat and rape to tillage planting, or using water-drought rotation and other methods; The third is to control the provenance, cut off its transmission route, manual uprooting, use of herbicides and deep ploughing and burial.

According to the control object of herbicides, the weed species that occur in paddy fields can be mainly divided into three categories: grassy weeds, broad-leaved weeds, and sedge weeds. Poaceae weeds include barnyard grass, goldenrod, etc.; Broad-leaved weeds include annual duck tongue grass, rain long flower, snakehead intestine, grain essence grass, Mo Shangcai, etc., perennial eye cabbage, wild aunt, etc.; The weeds of the sedge family include the annual heteromorphic sedge, the perennial stalk sedge, the water sedge, the firefly and the cow hair grass. In addition, some weeds in the ridges, such as creeping shears, rice and warts, have gradually entered the paddy fields, causing harm in some areas.

Therefore, it is necessary to select suitable herbicide varieties according to the specific situation of weeds in paddy fields. At present, the herbicide varieties that are produced to control barnyard grass are protopyrone (Nongsita), prochlor (Ruifete, Safute), butachlor (Marchette, new Marchette), grass (herbicide), saxophorium (arozin), grass dichlor (grass strong), benziachlor, dichloroquinolic acid (barnyard king), piperidan (urtobar), pentaflusulfamam (Daojie), etc., among which prochlor, butachlor, grass and other herbicides are effective for barnyard grass before the 2-leaf stage. For older barnyard grass with more than 3 leaf stage, only herbicide varieties such as dichloroquinolic acid, Podazhuang, and pentaflusulfamam can be used. The prevention of goldenrod includes cyanofluoxalate (gold), prochlor (Ruifete, Safute), butachlor (Marchette, New Marchette) and so on.

The control of triangular grass includes herbicidal pine (Bendasone, herbadan), benzsulfuron (Nongdeshi), pyrisulfuron (grass buster, Han Lexing), ethoxysulfuron (sun star) and so on. The control of broad-leaved weeds includes benzsulfuron (Nongdeshi), pyrisulfuron (grass nemesis, Han Lexing), ethersulfuron (shadovol), ethoxysulfuron (solar star), etc., among which pyrisulfuron-methyl and benzysulfuron-methyl can only prevent broad-leaved weeds and sedge weeds that have not been unearthed or have just been unearthed without the water surface, but after the adult plant grows out of the water surface, it is necessary to use herbicidal pine, dimethyltetrachloride, etc.