2.5% penoxsulam has a control effect on most of the main weeds in paddy fields such as barnyard grass, annual sedge and many broad-leaved grasses. 2. Good weeding effect.
2.5% penoxsulam is effective in controlling various weeds in paddy fields, especially for barnyardgrass, and has excellent control effect on elder barnyardgrass. 2.5% penoxsulam has a good effect on barnyardgrass in various subspecies, including barnyardgrass that is resistant to quinclorac, diarrhea, or acetyl-CoA carboxylase inhibitors. 2.5% penoxsulam also has a good control effect on many weeds that are resistant to many sulfonylureas. 3. Very safe.
2.5% penoxsulam is safe for rice and can be used safely from the one-leaf stage to before harvest. 2.5% penoxsulam has a short residue in the soil (degraded by microorganisms) and generally does not affect subsequent crops. But it should be avoided in the production field. 4. Advanced dosage form, rapid absorption, resistance to rain erosion, and longer duration.
Second, the use of technology:
Rice direct seeding field and rice seedling field are effective
The target of rice direct seeding field control:
Barnyard grass, shaped sedge, carp intestine, rhododendron, rain long flower, Lysimachia, sunshine fluttering grass, wild mushrooms, artichokes, Mo Shangcai, quinoa, amaranth, thistle, etc.
Stem and leaf spray, poisonous soil / fertilization method, stem and leaf spray.
20 ～ 40ml / 20L Water
Implement the operation:
(1) When spraying stems and leaves, the water consumption is 20-30 liters / mu.
(2) Drain the water before using the medicine, irrigate it 24 hours after the medicine, keep the depth of the water layer 3 to 5 cm for 5 to 7 days.
(3) the amount by spraying leaf and barnyard grass density is determined, generally 1 to 3-leaf stage of barnyardgrass, with 40 to 60 ml per acre; 3-5 leaf stage of barnyardgrass, with 60 to 80 ml per acre; Echinochloa crus-galli The density is large, and the upper limit of the dosage is used; the barnyard grass leaf age exceeds 5 leaves, and the dosage should be increased appropriately.
It is suitable for the spraying of stems and leaves or poisonous soil treatment after rice seedlings of various cultivation methods in rice fields. Most weeds in the field are best used in the 1-4 leaf stage, and the effective period can reach 30-60 days.
(4) In the 2-3 leaf stage of barnyard grass, use 40-80 ml of 2.5% emulsifiable concentrate plus 20-30 kg of water per acre ; or use 60-100 ml of 2.5% emulsifiable concentrate per mu and mix with poison soil or fertilizer. In the rice seedling field, during the 1.5-2.5 leaf stage of barnyard grass, spray 33-46 ml of 2.5% emulsifiable concentrate with 20-30 kg of water per mu.
Drain the field water before medication, irrigate it 24 hours after medication, and retain water for 5-7 days. The amount of application depends on the barnyard grass density and leaf age. Generally, barnyard grass uses 40-60 ml per acre in the 1-3 leaf stage and 60-80 ml per acre in the 3-5 leaf stage. The upper limit of the amount should be appropriately increased after 5 leaves.
Third, the mechanism of action and symptoms of miscellaneous herbs:
Mechanism of action:
The leaves, stems, and roots of the weeds are absorbed through the xylem and phloem and transmitted to the meristem. It is safe for rice because the active ingredients degrade rapidly in rice.
The weeds stop growing soon after being treated, at which time the competition for weeds to crop growth is reduced to a minimum. The rate at which weeds die completely is slow. The rate of weed death is related to the accumulation of branched-chain amino acids in the weeds.
Therefore, young weeds have small branched-chain amino acid reserves and often die faster; on the contrary, plants and older grasses die slowly. Unfavorable environmental conditions will slow down the rate of efficacy. The results of the research so far show that Daojie has the best efficacy when used in most weeds with 1 to 4 leaves.
Symptoms of harmful herbs:
Sensitive weeds treated after seedlings will show the following symptoms of poisoning: they will soon stop growing;
Two to four days after the treatment, the growth points of the weeds faded, and sometimes the veins turned red; the stem tips and leaf buds began to wither and necrosis 7 to 14 days after the treatment ; the weeds died two to four weeks after the treatment.
Weeds that have not germinated generally die before emergence or slowly grow to 1 to 2 leaf stage after emergence.