Live rice paddy field except for heavy seeding
Live weeds in direct seeding fields occur early and have a large amount of weeds, and there are multiple peaks of grass weeding. However, the grass weeds with the highest amount of weeds are the first grass-elevated peak 5-7 days after sowing. Therefore, when using "one, two killing, three subsistence elimination" methods to control weeds in direct-broad rice fields, the focus should be on closing the seedlings before sowing.
The law of weed occurrence
Live rice can be divided into two types: water live broadcast and dry live broadcast. The first grassing peak appears in 5 to 7 days after sowing in direct-seeded rice field. The grass is dominated by barnyardgrass and thousand-gold. The amount of weeds accounts for about 70% of the total amount of weeds; the second crop appears 15-20 days after sowing. The peaks are mainly styraxaceae, stewed vegetables, stewed vegetables, broadleaf weeds and other weeds; the third peak of weeding occurs 20-30 days after sowing. Mainly grass, there are a few broad-leaved weeds. The dry grassland of the direct seeding rice field is similar to that of the direct-seeding rice field. In addition to the above-mentioned dominant grass species in the direct-seeded rice field, there are weedy grasses such as crabgrass, iron leeks, and water peanuts.
Soil closed weeding
From the characteristics of weeds in direct-seeded rice fields, it can be seen that most of the weed seeds in the field grow grass shortly after rice is sowed, and the soil closure treatment prior to seedling sowing can prevent most of the weeds in the field. At present, wolfberry and dried gold are live weeds in paddy fields. They occur early, have a long period of occurrence, and have a large amount of occurrence. They account for 30%-70% of the total amount of grass weeds and over 25 days of grass production. The most effective measures to control alfalfa and Qianjin are also closed weeds before sowing.
There are many types of herbicides that are suitable for direct soil treatment after seedling in direct seeding rice fields. Among them, some are mainly aimed at grasses, such as Qianjin and Echinochloa crusgalli, such as pretilachlor, butachlor, oxadiazon, pendimethalin (Shi Tianbu), and isoproturon; Leaf weeds and sedges, such as bensulfuron-methyl, pyrazosulfuron-methyl, etc. It is advisable to rationally mix different herbicides with different herbicides in order to expand the spectrum of weed killing and prevent all kinds of weeds in the field; or to directly use compounding agents formulated from different herbicides, such as benzyl chloride ), Xinye (dioxin EC), quick removal (benzyl dipropene) and so on.
Dry direct rice fields usually drip after planting cover seeds, and the water is sprayed and sprayed immediately after it has dried naturally. Suitable herbicides include Shi Tianbu and Ding Ye EC. Soaking seeds after germination, the water can be dried after the application of direct-broadcasting net, live Ning herbicide containing precloam. The soil should be kept moist within 5 to 7 days after administration and within 5 days after treatment, but there should be no stagnant water on the field surface. After raining, it rains in time to prevent phytotoxicity and affect the emergence and growth of rice. Water direct broadcast rice fields are generally used for 3-4 days after sowing. Herbicides are available for sweepers, thousands of waves, and live broadcasts. For rice fields with Shitianbu and Dingye EC, rice seeds are soaked but not germinated. For paddy field with pretilachlor and its compound, rice seeds should be soaked and germinated. Due to the use of butachlor and its formulation alone for many years to control weeds in paddy fields, butachlor has a poor control effect on the gold and alfalfa grass, and the combination of bupropion and ketoxime can improve the control effect. In the last year, dry and dry rice fields with more dry gold and grass were used to control the herbicides such as Shi Tianbu and pretilachlor. There are more dew seeds in the field and dry and heavy waves with high safety should be used. Due to the lack of timely closure of the weeding plots due to soil drought, propionylamine and its compounding agents can be used for weed control when the rice seedlings are in the stage of standing needles and weeds are not emerged.
Stem and leaf removal
After the early closing treatment, all the weeds cannot be completely eliminated. The role of the stem and leaf treatment is to control the remaining weeds in the early stage and take into consideration the control of the weeds in the second grassy peak, which is a supplemental measure. After the emergence of weeds, appropriate stem and leaf treatment agents should be selected based on the field grasses. The grasses dominated by rushes were controlled with benzyl dichloride after the two-leaf one-heart stage and the second-third-leaf stage of the barnyardgrass. The fields could not have a water layer when applied, and the water was sprayed after the two large plants were applied, keeping 3 -5 cm water layer for 5-7 days, after which normal management resumes. The amount of pure quincloracic acid per mu cannot exceed 25 grams to avoid phytotoxicity. The grass is older or has developed resistance to quinclorac, which can be controlled by Origen or Han Lesheng, and increase the dosage as the grass age increases. The plots dominated by Thousand Gold are controlled by a daughter's milk after the first leaf stage of the rice's first leaf and when the dried gold is released, and the water layer is established in the field two days after the application. The use of a combination of herbicides to control broad-leaved weeds such as bensulfuron-methyl, 2a-4-chloro-, etc., has an antagonistic effect, which should be applied 5-7 days apart, or increase the amount of gold (generally 10 ml per mu). For older dry gold, it can be controlled by Weiba, applied after the rice leaf stage, and strictly control the dosage. 6.9% Wei Ba concentrated emulsion dosage per acre, indica rice 30-, 35 ml is appropriate, indica rice 30 ml is appropriate, add water 40 kg uniform spray. In rice fields dominated by broad-leaved weeds and sedges such as Aquatronia cuspidata, Rhizoma lycopersicum, and Trichoderma spp., sun stars (15% ethoxysulfuron dispersible granules), D-sulfosulfuron-methyl, thiazolone, and its derivatives can be used. 2 A 4 chlorine and other control. 2 A and 4 chlorine should be applied after the 4-leaf stage of rice to avoid phytotoxicity. After the second stem and leaf treatment, there are still a lot of weeds in the field, which can be treated according to the above-mentioned stem and leaf treatment agent according to the field grasses.
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