Herbicides are the most commonly used pesticides. If the proportion of spraying is wrong, or if the crops are not sprayed, the herbicides will appear as phytotoxics. How to prevent and control the phytotoxicity of herbicides? Your answer.
First, the diagnosis of herbicide phytotoxicity
The main criteria for judging herbicide phytotoxicity are: weak yellow seedlings, slow growth, dead roots of black roots, greening, necrosis and deformity of stems and leaves, reduced number of flowers and fruits and no heading.
2. Remedial measures for herbicide phytotoxicity
1. Water spray detoxification: If the herbicide is applied excessively, the leaves of the affected crops should be washed with water as early as possible 3 to 5 times. For herbicides which are easily decomposed by alkaline substances, 0.2% quicklime or 0.2% sodium carbonate water dilution solution can be used. Wash and reduce the amount of foliar agents.
2. Drainage and irrigation method: For the phytotoxicity caused by the application of herbicides such as 2, 4-chloro and 2,4-D butyl ester, it can be firstly irrigated with large water, then drained into the field, and finally filled with new water, combined with quick-acting effect. Nitrogen fertilizer promotes the recovery of physiological functions as soon as possible.
3. Strengthen field management: (1) Combine watering, increase organic fertilizer and quick-acting fertilizer, promote root development and regeneration, restore physiological functions of affected crops, alleviate phytotoxicity; strengthen cultivating loose soil, enhance soil permeability and increase ground temperature, Enhance the ability of roots to absorb nutrients and water, so that plants can resume growth and development as soon as possible, reducing the loss of phytotoxicity. (2) Spraying foliar fertilizer: After the occurrence of phytotoxicity, it is necessary to spray foliar fertilizer in time , usually spray once every 5~7 days, even spray 2~3 times, choose 1%~2% urea solution, 0.3% Spraying potassium dihydrogen phosphate solution, Tianda 211, viability, Tianfengsu or Huimanfeng 800~1000 times solution. (3) Spraying plant growth regulators: crops are tainted by hormonal herbicides such as 2,4-D butyl ester, 2 methyl 4-chloro, paraquat, orthoquinone, etc. When the crop residues of the crop herbicides are damaged, plant growth regulators such as alizarin lactone and sodium nitrophenolate may be sprayed at the seedling stage to stimulate the damaged plants to resume growth.
4. Application of herbicide antidote: Nian is a herbicide side effect prevention and control agent has been widely used. The soil can be sealed with a mixture of 80 g of nai and a herbicide per acre. After misuse of the herbicide, spray 80-100 grams of Nai'an alone per acre to remove the herbicide damage and shorten the herbicide inhibition period for more than 10 days. In the early stage of emergence of herbicides in crops, 80-100 grams of nai is used per acre for stem and leaf spray.
Fridge Magnets,Souvenir Fridge Magnet,Qatar Fridge Magnet,Creative Fridge Magnet
Sintered Neodymium Magnet Co., Ltd. , http://www.cnhhmagnet.com