Common herbicides are acetochlor and bensulfuron-methyl.
Bensulfuron-methyl can control annual and perennial broadleaf weeds and Cyperaceae weeds. Such as Hedyotis diffusa, POTAMOGETON POTAMOGETON, Herba Sarcodactylis, avocado, Cyperus heterophylla, Cyperus esculentus, Erigeron Erigeron, POTAMOGETON crispus, descendants of Leymus chinensis, descendants of Leymus chinensis, descendants of Leymus chinensis, descendants of Leymus chinensis and so on. It has inhibitory effect on sagittaria dwarf and barnyard grass, but it has poor control effect on gramineous weeds.
Crops used: wheat, rice seedling field, Honda and direct seeding field.
Note: the fluidity of this agent in soil is small, and the temperature and soil quality have little influence on it. Prolonging the water retention time is the key to improve the weeding effect in rice fields. The experiment shows that it is appropriate to keep water for 5 ~ 7 days, not less than 3 days.
Features:
It is a selective systemic conductive herbicide. Pesticides diffuse rapidly in water, and are absorbed by the roots and leaves of weeds and then transferred to other parts, which hinders the biosynthesis of branched-chain amino acids. The growth function of sensitive weeds is blocked, and the young tissues turn yellow prematurely, which inhibits the growth of leaves and roots. It can effectively control annual and perennial broad-leaved weeds and sedges in rice fields 1, and can be absorbed by weed roots and leaves and spread to other parts. Harmless to rice and flexible to use.
application area
It is suitable for controlling annual and perennial broadleaf weeds and sedges in rice fields. When applied after crop germination and before and after weed germination, it has a good effect on Hedyotis diffusa, POTAMOGETON POTAMOGETON, Lycopodium japonicum, etc. And asparagus weeds (Sedum heterophyllum, sedge, etc. ).
How to use:
1. The 2-leaf period from sowing to weed can be applied to rice seedling field and direct seeding field. To control 1 year-old broad-leaved weeds and sand grasses, 20 ~ 30g of 10% wettable powder is used per mu, 30kg of water is sprayed or 20kg of fine fluvo-aquic soil is sprinkled. Keep the water layer for 3-5cm for 3-4 days.
2. In rice transplanting field, it can be used 3 weeks before and after transplanting, but it is better to apply pesticide 5 ~ 7 days after transplanting. Use 20-30g 10% wettable powder per mu to control perennial weeds and barnyard grass, and the dosage can be increased to 30-50g, and the water layer can be sprayed with water or mixed with fine soil, and the water layer can be naturally dried for 3-4 days.
Precautions:
1. Bensulfuron-methyl had a good control effect on weeds in the 2-leaf stage, but the control effect was poor after the 3-leaf stage.
2, the effect on barnyard grass is poor, and barnyard grass-based rice fields are not suitable for use.
3. Spraying equipment should be rinsed clean after use.
4. When applying pesticides, there must be a water layer of 3 to 5 cm in the paddy field to make the pesticides evenly distributed. 7 days after application, do not drain or string water, so as not to reduce the efficacy.
The dose of this medicine is small, so we must weigh it accurately.
6. Depending on the grass situation in the field, it is suitable for plots with broad-leaved weeds and grasses and plots without barnyard grass.
The latest progress: Bensulfuron-methyl (when rice is cultivated, there is no grass, which is convenient for farmers to use) was first used to control sedge and broadleaf weeds in rice fields, and now it has been used to control broadleaf weeds in wheat fields. Bensulfuron-methyl is a selective systemic conduction herbicide, which is absorbed by the roots and leaves of weeds and transferred to various parts to play a role, and has good safety to crops such as wheat and rice. When used in wheat fields, it can effectively prevent and control broad-leaved weeds such as Cyperus rotundus, Stellaria straminea, Cardamine, Shepherd's purse, Chenopodium album and rice chaff. Usually, 30-40g 10% bensulfuron-methyl is sprayed per mu during the 2-3 leaf stage of weeds and when the soil is wet. The effective components of drugs diffuse quickly in water, and the temperature and soil quality have little influence on weeding effect, so the mobility in soil is small. The effect is very good in paddy field, and the soil must be moist when used in wheat field. If the soil is dry, the control effect is low.