Fat damage. Too much soluble nitrogen, potassium and other chemical fertilizers close to the seeds during sowing will inhibit the germination of the seeds or cause death after emergence from the soil, and the remaining seedlings will dwarf and the leaves will turn yellow or die.
High temperature and drought. The maize seedlings lacked rain for a long time, resulting in atmospheric and soil drought. The upper leaves of young plants rolled up and turned dark. In severe cases, the edges or tips of the leaves turned yellow, and then the tips or leaves of the lower leaves dried up and died.
Residue herbicide damage on the scorpion. The application of herbicide in wheat field is too late, due to the larger grass age, 0.5 to 1 times more than the conventional amount, increasing the soil pesticide residues, and the summer corn sowing date mostly in June 5 to 10, did not reach the safe period, leading to corn Produce phytotoxicity.
Seedling blight. Summer corn infected with seedling blight, leaf sheath turned brown, was lacerated, yellow leaves, the edges were dry coke-like, heart leaf curl, easy to fold, after the leaves gradually dry from the bottom, no secondary roots produce dead seedlings, there are A small number of secondary root formation weak seedlings.
Control measures: 1. Select drought-resistant and disease-resistant varieties. 2. The use of formula fertilization technology, timely and appropriate application, should not be excessive. 3. When applying herbicides, strictly select the species and master the dosage so as to avoid the concentration being too high and it is not advisable to spray directly on the bell mouth. 4. Do not use sensitive insecticides such as trichlorfon and dichlorvos in the corn field, and strictly control the amount of phoxim to control underground pests. 5. When drought or phytotoxicity occurs, water the plant in time and strengthen management. 6.Using urea, potassium dihydrogen phosphate aqueous solution and superphosphate, grass ash filter leachate spray, can reduce temperature and humidity, while providing the leaves with the necessary moisture and nutrients. 7. Seedling blight, one of the following pesticides may be sprayed on the stem base: 50% carbendazim 600 times, 20% triadimefon 1000 times, hymexazol 3000 times, spray twice.
Plastic additives, also known as plastic additives, are compounds that must be added to polymers (synthetic resins) to improve their processing properties or to improve the properties of the resin itself. For example, in order to reduce the molding temperature of PVC resin, to make the product soft and added plasticizer; Another example is to add foaming agent in order to prepare light weight, anti - vibration, heat insulation, sound insulation foam plastics; The thermal decomposition temperature of some plastics is very close to the molding temperature, and the molding cannot be done without adding heat stabilizer. Therefore, the plastic assistant agent occupies a particularly important position in the plastic forming process. A class of auxiliary agents for plastic molding products, including plasticizer, heat stabilizer, antioxidant, light stabilizer, flame retardant, foaming agent, antistatic agent, mildew agent, colorant and whitening agent (see pigment), filler, coupling agent, lubricant, mold release agent and so on. Colorants, brighteners and fillers are not special plastics chemicals, but the general use of materials.
Imported Plastic Additives,Pvc Additives Distributor,Plastic Additives,Environmental Friendly Plasticizer
Xingbang High Molecular Materials Co., Ltd. , https://www.chemicaladditive.com