Herbicides are substances used to control unwanted plants, commonly known as weeds. They play a crucial role in agriculture by preventing weeds from competing with crops for nutrients, water, and sunlight. There are two main types of herbicides:
Selective herbicides: Target specific weed species while leaving crops unharmed.
Non-selective herbicides: Kill all plants they come into contact with.
Historically, weed control involved manual methods like tilling and altering soil conditions. The first major breakthrough in chemical herbicides came during World War II with the development of 2,4-D, which allowed for selective weed control in cereal crops.
Modern herbicides are widely used in agriculture, forestry, and even urban landscaping to maintain clear spaces and prevent invasive plant species from spreading. However, their use must be carefully managed to avoid environmental damage and resistance in weeds.
Common Name Glyphosate
Chemical Name N-(phosphonomethyl)glycine
Molecular Formula C3H8NO5P
CAS NO 1071-83-6
EINECE NO 213-997-4
Application It is used to kill weeds, especially annual broadleaf weeds and grasses that compete with crops.
Paraquat is a non-selective herbicide. However, due to the lack of a specific antidote, the mortality rate after poisoning is high, the death process is long, and patients suffer greatly. There is a strong call for its ban in society. In order to safeguard people's lives and health safety and ensure the safe production and use of paraquat, the Ministry of Agriculture has successively taken relevant measures in recent years to strengthen the agricultural registration, production, sales and use management of paraquat products. Paraquat, with the chemical name 1-1-dimethyl-4-4-bipyridine cationic salt, is a fast-acting non-selective herbicide. It has contact killing effect and certain systemic effect, and can be quickly absorbed by the green tissues of plants, causing them to wither and die. It has no effect on non-green organizations.
It is a non-homogeneous triazine herbicide and a photosynthesis inhibitor. It is mainly used to control gramineous weeds (especially broomweed) and certain broadleaf weeds in cereal crops (such as wheat) and tomato fields, with a dosage of 0.55 to 1 kg of active ingredient per hectare. When applied before germination and after germination in autumn, it has an excellent control effect on the tail of the rat. Applied before tillering, it can control wild oats, chickweed, etc. The dosage is 0.75 to 1.5kg/hm2.
Selective systemic herbicide. Salts are readily absorbed by the roots, whilst esters are readily absorbed by the foliage. Translocation occurs, with accumulation principally at the meristematic regions of shoots and roots. Acts as a growth inhibitor.
Post-emergence control of annual and perennial broad-leaved weeds in cereals, maize, sorghum, grassland, established turf, grass seed crops, orchards (pome fruit and stone fruit), cranberries, asparagus, sugar cane, rice, forestry, and on non-crop land (including areas adjacent to water), at 0.28-2.3 kg/ha. Control of broad-leaved aquatic weeds. The isopropyl ester can also be used as a plant growth regulator to prevent premature fruit fall in citrus fruit.
Both TC and formulations are available for Glyphosate, Atrazine, Cyhalofop-butyl, Bispyribac Sodium, Prosulfocarb, Nicosulfuron, Dicamba, S-metolachlor, Mesosulfuron-methyl, Clodinafop-propargyl
