1. Do it in the corn field: "To distinguish the species, do not use drugs blindly." Since most of the post-emergence herbicides for corn are nicosulfuron, some corn varieties are sensitive to this ingredient and are prone to phytotoxicity. Some products indicate that they are forbidden to use in corn inbred lines, sweet corn, waxy corn, etc. Therefore, it is said that post-emergence herbicides are not suitable for any species, and they should be read in detail. Use, improper use is not necessary to prevent corn seedlings produce phytotoxicity.
2.Do the following when dispensing: "Double dilution, do not mix water and drugs directly." In particular, the secondary dilution of powder-type pharmaceuticals is the same as for a chef to make a porridge. Under the premise of selecting a certain amount of water, a small amount of water is used first. Mix evenly with the drug, add the remaining water, and spray evenly after mixing. Avoid the uneven mixing of water and medicine, where weeds die when the piece is sprayed to the medicine, and weeding effect of weeds continues to grow where the water is sprayed.
3. Do it when spraying: “Do not spray at high level without low spray.†Here, “low, high†means low and high temperature. That is, before 9 o'clock in the morning when the temperature is lower in the day, the drug is sprayed after 4 o'clock in the afternoon. Do not spray on high temperature, dry weather mornings, noon or afternoon, so that the amount of herbicides that enter the weeds is limited, absorption is insufficient, and the effect of weeding is affected. At the same time, corn seedlings subjected to high temperature spraying are also prone to phytotoxicity.
4. Do it when weeding: "Spray small, do not spray the old" to seize the weeds from the second leaf to the four-leaf heart. Weeds are sprayed in a favorable period with a small area of ​​spraying and low resistance. Don't wait till the weed grows to more than 10 cm high, and spray it with a green eye. In hot and dry years, although the weeds are short, but because of the long growth time, the root system is developed, forming a leafy gray "little old grass." Should increase the amount of spray liquid, liquid per mu of not less than 40 kilograms, spray the whole plant spray weed, do not hesitate to water without hesitation, otherwise it can not reach the effect of net weeds.
5. When weeding pests and pests, do: “Do not mix pesticides with pyrethroids and do not mix with organophosphorus pesticides.†When pests occur at the seedling stage of the corn field, in order to save time and labor, herbicides are sprayed. At the same time, weeding and pest control can be carried out at the same time. However, mixed pesticides should be selected pyrethroids and carbamate insecticides, spraying should pay attention to avoid the leaves as much as possible, anti-drug liquid irrigation.
6. When the corn seedlings are applied after five leaves, do: “Spot spray, do not spray all over the field†Corn 2-5 leaf stage is the best spraying time after weeding, if you miss the best period and when necessary weeding , should be sprayed on the ridge, can not spray all over the field, so as not to cause phytotoxicity. Otherwise, the light causes yellowing of the heart of the corn, and the leaves of the thicker leaves are whitish and the whole plant stops growing.
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