There are several herbicides for direct seeding rice fields, which are explained by the China Pesticide Network Xiaobian:
Flexible
accordion guide shield (Plastic Bellow Cover) is a kind of shield machine. Organ of the shape of the shield can be designed according to the actual needs various styles, at the same time,
the size of shield can be made according to the actual needs. Shield (cover) for external use German
nylon fabric, with PVC board support, both ends load for a fixed metal skeleton
connection or plastic skeleton.
This kind of shield (cover) has
advantages of small compression. Product can be oil resistant, corrosion
resistant, hard objects collision deformation; Walking at the same time product
has long life, good sealing, stable, durable, etc. Using this kind of product
can bring perfect effect to the use of the machine tool. Shield (cover) inside
without any metal parts, don't worry about shield (cover) work when a loose parts and
causing severe damage to the machine.
The working speed of shield`s air bellows can reach 200 m/s. Flexible accordion guide shield (Plastic
Bellow Cover) has been
widely used in numerically controlled machine tools, electronic equipment,
stone machinery, glass machinery, door machines, injection molding machine,
manipulator, lifting transport equipment, automatic warehouse etc.
Structure of common Flexible accordion shield (Plastic Bellow Cover) material is as follows:
Plus material:
Nylon cloth or protective cloth
Support: PVC sheet
Connecting plate:
Resin plate, iron plate
Pulley: Copper or
nylon bearing
Design parameters for flexible accordion guide shield (Plastic Bellow Cover)
1.
L: Length
after drawing
2.
L1: Length
after compression
3.
L2: Travel
length
4.
B: Total
width of the shield
5.
B1: Guide
width
6.
B2:
Interior width of the shield
7.
H:Total height of the shield
8.
H1:Guide height of the guide
9.
H2:Interior width of the shield
To calculate the dimensions of the welded
bellow at the design stage, it is useful to pay mind some date:
1.
The
standard folds have the following height: 15mm/ 20mm/ 30mm/ 35mm/ 40mm/ 45mm/
50mm;
2.
The
total play between the slides and the bellow must be from a minimum of 5mm to
maximum of 10mm.
3.
The
extension of one fold is equivalent to twice the fold`s height minus 10mm.
4.
The
thickness of a compressed fold is on average 4mm.
5.
The
compressed length of the bellows is equal to:
Extension of
bellow÷extension of one fold ×(3~4.5mm)+flange thicknesses
The following is the multi-purpose shields (covers) that can be used for
any types of machine or tools thanks to their various shapes and space-saving
design.
Plastic Bellow Cover Plastic Bellow Cover,Rod Bellows Shield Cover,Slideway Bellows Shield Cover,Rolling Curtain Shield Cover,Flexible Accordion Guide Shield Cover HEBEI HANMAC MACHINE CO., LTD. , http://www.chinahanmac.com
1. Oxatrix oxaloin (Nongsi, oxacillin) is a selective pre-emergence and post-emergence herbicide, which acts by contacting and absorbing the weed shoots or seedlings with the agent. After the seedlings are applied, the weeds are absorbed through the aerial part. After the medicament enters the plant body, it accumulates in the vigorous growth part, inhibits the growth, and causes the weed tissue to rot and die. In the light conditions, the grass killing effect can be exerted. After the application of paddy field, the liquid quickly spreads on the surface of the water and is quickly adsorbed by the soil, so the downward movement is limited, and it is not absorbed by the roots, and the metabolism in the soil is slow. It can effectively prevent valerian, thousand gold, cow felt, shaped sedge, water sedge, sunshine sungrass, ragweed, rain long flower, Alisma, sapling grass, fake leeks, water leeks, water dents, Siyeping can significantly inhibit eye vegetables, dwarf mushrooms, and sorghum.
The dry rice field can be used before sowing or before rice to 1 leaf stage, weed 1.5 leaf stage, 25% per acre with 100-200 ml of colostrum, or 25% of medicinal emulsifiable concentrate 70-150 ml. Add 60% of Marshette EC 70-100 ml, add 45-60 kg of water to prepare a liquid, and spray evenly. It is also possible to use a compounding agent such as Funon (60% D. oxalicum emulsifiable concentrate containing 10% oxaloacetone, 50% butachlor), 36% butyl oxalate emulsifiable concentrate, and the like.
2. Pyrazosulfuron-methyl pyrisulfuron-methyl (cursor, Mercury) is a sulfonylurea selective paddy herbicide . The active ingredient can be rapidly diffused in water, absorbed by the roots of the weeds and then transmitted to the plant body, rapidly inhibiting the growth of the stems and leaves of the weeds and the roots, eventually leading to complete weeds. It can be used to control annual weeds and some perennial weeds such as ragweed, squash, sedge, sedge, and sedge, which have certain inhibitory effects on valerian and sorghum.
Currently registered for direct seeding rice fields, 10% pyrazosulfuron-methyl WP, 10% pyrazosulfuron-methyl tablets, 10% wettable powder 10-20 g per acre, 3-10 days after sowing, 稗Grass 1.5 leaves mixed with fine soil. Apply medicine to Putian or live field, and ensure that the board is wet or has a thin layer of water. The drug is safer for rice, but the resistance of different varieties of rice to pyrazosulfuron-methyl is quite different. The drug mist and the drainage in the field are harmful to the surrounding broad-leaved crops and should be noted.
When the valerian is more, it is mixed with butachlor, grass, quinclorac and the like, and the control effect is good. It is also possible to directly use a compound containing pyrazosulfuron, such as rice gluten (20% pyrazopyridine WP, containing 1% pyrazosulfuron, 19% propionamide), Shuangyi No. 2 (24 % pyrazopyridine WP, containing 23.6% butachlor, 0.4% pyrazosulfuron).
3. Methamphetamine Methionamide (cyclocliteride) is a selective systemic herbicide that is mainly transmitted through the bud and root, and is transmitted to the weeds and young leaves of the weeds through the xylem and phloem. Prevent the growth of cells at the growth point of weeds and eventually cause plant death. Due to its low solubility in water, herbicidal activity is highest under water retention conditions. The soil has strong adsorption capacity for this product. After application, most of the drug is adsorbed on the surface layer of the soil, and a treatment layer is formed within 1 cm of the soil surface. This can avoid the contact between the rice growth point and the agent, which makes it higher. Safety, and weeds such as weeds with growth points on the surface of the soil have strong ability to prevent growth and killing, and also inhibit the perennial weeds that propagate on the surface of the seed, and have low effect on deep weeds. When using Tian Yingping, the dew area, the sandy soil and the water leakage field have poor effect.
In order to expand the spectrum of killing grass, it should be mixed with the farmer's time or the grass. After application, keep the water layer of 3-5 cm for 5-7 days. If there is water shortage, it can be hydrated slowly, and it can not be drained. The water layer will flood the rice heart and float, which will easily cause phytotoxicity. According to the pesticide network , it is also possible to use a compounding agent such as caesium (50% benzoyl benzyl WP, containing 47% thiaceuramide, 3% bensulfuron), and æˆ æˆ (68 % phenothiyl benzyl wettable powder containing 64.8% mefenacetamide, 3.2% bensulfuron-methyl, and the like.
4, cyprosulfuron-cyclopropanesulfuron sulfonamides, can be absorbed by the roots and leaves of weeds, conduction in the plant, so that the cells stop dividing, and finally lead to weeds. After the stem and leaf treatment, the sensitive weeds stop growing and the leaves are chlorotic. According to different environmental conditions, the weeds can completely die after several weeks. This medicine can be used for transplanting Honda, and can also be used for directing rice fields to control broadleaf weeds and sedge weeds, such as ragweed, rain long flower, Alisma, cattle felt, dwarf mushroom, shaped sedge, etc. At the dose, it has a good inhibitory effect on valerian, and it also has a strong inhibitory effect on the perennial refractory weeds.
5, Hecao Danhe Cao Dan (killing grass, killing grass, straw, in addition to Tian Hao) for carbamate selective systemic soil treatment herbicide, can be absorbed by weed roots and shoots In particular, the young shoots are transferred to the plant after absorption, and have a strong inhibitory effect on the growth point, resulting in the germination of the weed seeds and the weeds in the early stage of germination. Valerian absorbs the grass faster than rice, and the rate of degradation of grass in the body is slower than that of rice, which is the physiological basis for the formation of selectivity. Such herbicides can be quickly adsorbed by the soil, and thus have a small leaching property with water, and are generally distributed at 2 cm of the soil surface. Soil adsorption reduces losses caused by evaporation and photolysis. It can be used to control valerian, oxweed, sedge, ginseng, sedge, and ragweed, and has a poor effect on sedge in the three-leaf period. After transplanting in the field, the direct seeding field and the polder, it is necessary to pay attention to keeping the water layer and the rice emergence to the vertical needle period. Otherwise, it will cause phytotoxicity.
Hecaodan can be mixed with 2 to 4 chlorine, bensulfuron-methyl, pyrazosulfuron-methyl, chlorpyrifos and other herbicides to expand the herbicide spectrum, but it can not be mixed with 2,4-D, otherwise it will reduce the herbicidal effect. It is also possible to use a compounding agent containing grass dandan, such as He Kuojing (50% benzyl·, wettable powder, containing 49% grass, 1% bensulfuron), live straw (36%). Benzyl wettable powder, containing 1% bensulfuron-methyl, 35% grass, and the like.
China Pesticide Network has learned that Jinqiu (10% cyprosulfuron-wet WP) is currently registered for use in rice live field, and can be applied within 2-15 days after rice transplanting or sowing, weed 1.5-2.5 leaves The period is most sensitive, and it is ineffective for weeds beyond the 3-leaf stage, and 10-20 grams of 10% wettable powder per acre. In the live field, the golden autumn and the surface must be kept moist or mixed. Whether it is transplanting the field or directing the field, maintaining the water layer is beneficial to the effect of the drug. Generally, the water layer is kept 3-5 cm after application, and the water is kept for 5-7 days. After the golden autumn application, it can quickly adsorb to the surface layer of the soil, forming a very stable drug layer. The rice field leakage, flood irrigation, string irrigation, and heavy rain can still obtain good efficacy. In order to expand the spectrum of killing grass, Jinqiu can be mixed with Wo Da Zhuang, Marshette, and quick killing. 
Direct seeding rice field for herbicides