Is rice acetochlor naian detoxification effective?

Zhang Dean, a farmer from Zhanglao Township, Gushi County, asked: When neighbors injected acetochlor to the rice seedlings last year when they weeded, there was almost no harvest in the whole field. I heard that Nian is an antidote. What happens after spraying?

A: Acetochlor is a selective pre-emergence herbicide. Gramineae mainly absorb the pesticide through the budding sheath. Therefore, it should be applied before the weeds are unearthed and the soil should be closed. Otherwise, the control effect is poor. Cucumber, rice, spinach, wheat, leeks, millet, sorghum and other crops are sensitive to acetochlor, and it is not appropriate to apply this drug to such farmland. In particular, paddy field must not be applied acetochlor.

After the rice was damaged by acetochlor, it could not be relieved by Naian. It is known that Naian has a detoxifying effect on many herbicides such as sulfonylureas and amides, but it is generally required to use them in combination with the herbicides concerned, or to use them separately in advance if there is a possible herbicide residue in the soil. Whether rice bran was damaged by acetochlor and then rescued by Neian was effective, we did not receive a clear reply from the relevant authorities. Considering that even if the damaged seedlings can gradually recover their growth, their growth is relatively weak, and the rice breeding season is very tight. It is recommended that the seedlings be replanted as soon as possible so as not to misunderstand the farming season.

Soil has a strong acetochlor sorption, and acetochlor has less leaching after being applied to farmland. The half-life of acetochlor in soil is 8-18 days. There is still a certain risk of re-seeding and raising seedlings after the plowing is done in Putian where acetochlor is misused. It is better to change the fields and raise the seedlings. These plowing fields can sow the legume crops after the plowing. Of course, if the amount of acetochlor is not too large, it is also possible to transplant rice after ploughing (there are some acetochlor admixtures registered for use in rice transplanting fields that require application after rice is transplanted to live trees). Spraying Nian'an and other antidotes on seedlings before transplanting may be more beneficial to rice seedlings from acetochlor.

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