Analysis and Remedy of the Damage of Corn Nicosulfuron
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According to analysis, there are several reasons for the emergence of nicosulfuron in corn.
(1) The dosage is too large.
(2) Improper use period. The use of nicosulfuron-methyl before or after the 6-leaf stage of maize is susceptible to phytotoxicity.
(3) Improper application method. After the 5 leaf stage of corn, the application is not directed spray, even mixed with insecticides, and a large amount of liquid is applied to the corn heart leaves to cause phytotoxicity. In addition, corn that has used organophosphorus pesticides is sensitive to nicosulfuron. If the interval is less than 7 days, it is easy to cause phytotoxicity.
(4) Irregular spray.
(5) After the drug, it is vulnerable to low temperature and rainy weather.
(6) Sweet corn and bursting corn, sensitive to nicosulfuron.
To prevent the harm of nicosulfuron, the dosage should be determined according to the soil, meteorological conditions and grass conditions, evenly sprayed, not re-sprayed or leaked. Second, we must strictly control the duration of medication. Maize is most resistant to nicosulfuron at the 3~5 leaf stage, and it is safest at this time. The corn should be sprayed after the 6-leaf stage to avoid contact with the corn leaf. It is not advisable to use corn before and after the 2 leaf stage. Once again, it is necessary to increase the level of application. Use good performance sprayers, such as the WS-16P manual sprayer produced by Shandong Weishi Plant Protection Machinery Co., Ltd. and the Taishan -18AC knapsack mobile spray powder machine produced by Shandong Huasheng Agricultural Medicine Co., Ltd.
When the corn is slightly harmed by nicosulfuron, the growth is temporarily inhibited and does not need to be treated. It can be recovered after a period of time without affecting the yield. If the phytotoxicity is heavier, take some measures;
(1) Pour enough water to make the corn roots absorb a large amount of water to reduce the concentration of herbicides in the plants. In combination with watering, fertilizers such as manure and manure, ammonium urate, ammonium nitrate or urea are added to promote root growth. It can also be sprayed with 1%~2% urea solution or 0.2%~0.3% potassium dihydrogen phosphate solution or Huimanfeng 600~800 times solution.
(2) Spraying Yunzhisu lactone, gibberellin, and detoxification can promote the early recovery of the damaged plants.
(3) Appropriately increase the depth and frequency of depression and enhance soil aeration.
(4) Control pests and diseases in time to improve the ability of corn to resist stress. If the above measures still do not alleviate the symptoms of phytotoxicity, they should be destroyed or replanted as soon as possible.
Source: Jiangsu Agricultural Science and Technology News