Main characteristics of pyrimidine herbicides : 1. Mainly control weed shoots, used before weed germination or early post-emergence, the best herbicidal effect.
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2. It is mainly absorbed by plant roots and transmitted to plant shoots and leaves; usually, plant stems and leaves are not easily absorbed, so they are used as soil treatment agents.
3. The herbicidal effect is closely related to soil water content. Rain or irrigation can significantly improve the efficacy within two weeks of application, and it is difficult to control deep-rooted weeds in arid areas, usually slow to perennial weeds.
4. After being applied to the soil, it is not easy to adsorb to the soil colloid and is easy to be leached in the soil.
5. Pyrimidine herbicides have a long-lasting effect in soil, with a half-life of about 5-6 months, and a high-dose duration of more than one year.
6. Inhibition of photosynthesis is the main mechanism of action of pyrimidine herbicides. Therefore, the light conditions after application also have an effect on its efficacy.