How to effectively prevent herbicide injury

In rice production, phytotoxicity often occurs due to misuse, excessive use, improper use period, long-acting herbicide residue, soil quality and improper human management. The common causes and manifestations of herbicide injury are as follows.

(1) Using hormone herbicides, such as 2-methyl-4- chloride and 2,4-butyl ester, under the conditions of low temperature, deep water irrigation and poor growth of rice plants, it is easy to inhibit the growth of onion leaves and roots and tillering of rice.

(2) Using triazine herbicides, such as Xi Cao Jing, Pu Cao Jing, Wu Cao Jing, etc., under the condition of high temperature or in the field with small adsorption capacity of sandy soil and sandy loam, the paddy field with poor water permeability, extremely shallow or deep water, weak seedlings or poor rice plant development is easy to wither rice from the lower leaves to the tip, inhibit tillering, wither the new leaves of the main stem and then die the whole plant.

(3) When the paddy field is uneven or there is water in the direct seeding field, the application of amide herbicides, such as thiabendazole, butachlor, rifetail, etc., is easy to make rice buds twist and bend into hooks.

(4) The use of amide herbicides in field leakage, shallow water cultivation, extreme high temperature above 29℃ and drastic temperature changes can cause serious phytotoxicity symptoms such as dwarfing, growth and tillering inhibition. Amide herbicides, such as dimehypo, are used together with organophosphorus and carbamate pesticides within 10 days before and after application, and rice plants will wither at the tip and quickly spread to the whole leaf and die. Excessive use of nongsita resulted in symptoms such as leaf spot blight, dead heart leaves and severe growth inhibition of rice.

The important measure to prevent phytotoxicity is to avoid excessive use. Dosage should be adjusted according to soil and climate conditions; Correctly grasp the appropriate period of drug use, adjust spraying equipment and spray evenly; After applying long-acting herbicides, arrange the following crops reasonably; Methoxyphenol ketone or BNA-80 was added to the herbicide to prevent dechlorination and rice dwarfing.