How to do the harm of corn herbicide?

How to do the harm of corn herbicide? Please instruct a farmer to weed with atrazine, Acetochlor and 2.4 Mel D-butyl at the post-seedling 3-4 leaf stage if he missed weeding before planting corn. After treatment, drug damage was found in maize when the plant was about 1 meter high and 10-12 leaves were ready to be fertilized on June 22. At this time, the symptoms of plant damage are: the heart leaves are rolled up like a long whip, hard, the leaves next to the whip leaves are also wrinkled and cannot be completely flattened, and the serious roots have begun to swell. The affected area reached more than 60%. Because the farmer found that the corn drug damage was too late, it could not be saved with medicine. So two methods of cutting off the top and cutting the root were taken immediately the next day, and the effect was good. According to the investigation after autumn, the plant grown by the method of removing the top tip has normal panicle, and has better yield and is practical. Its practice and effect are summarized as follows. The way to go to the top: pinch it by hand along the diseased part, and there is a soft and hard feel in the central part of the plant, and cut it all off from the hard part of the hand. On the second day, new leaves grow from the amputated place, and after expansion, they no longer shrink and curl longitudinally, forming normal plants. Topdressing was carried out on July 18, with 10 kg of urea per mu. According to the investigation on July 22, the plants without top tips have entered the stage of male pollen dispersing, the male ear size is normal, and the plant height and stem thickness are no different from those of normal plants. only in the part of the root near the ground where the root used to be a wound, it was found that the regenerated shoot and the original main stem had been cut, and the original main stem swelled slightly thicker than the later main stem at the edge of the interface. The whole root cut off about 1000 plants, and the plants formed by tillers grew narrowly among the strong plants, 90% had no spikes, and 10% had spikes but very small. According to the investigation of the ripening period on September 20, the panicles of the plants with complete roots cut off were small and late maturing, which only reached the level of green food. The bracts of the untopped and normal plants were white, and the seeds showed mature grain color, the difference was that the maturity of the untopped seeds was slightly later than that of the normal plants, the number of grains per ear was between 560 and 800 grains, and the number of grains per spike was between 480 and 740 grains. The 100-grain weight was measured on October 26th, the 100-grain weight of normal spike was 33.2 g, and that of untopped spike was 34.5 g. From the above results, it can be seen that the method of removing the top tip to save the drug damage loss of corn is very effective, and the farmer has greatly reduced the loss. Click to get mass herbicide use technology click to get mass pesticide application technology click to get massive corn planting technology