our company has ran Mineral Products Trading many years,we have close relationship with them,The relationship between mankind and chemical industry is very close,
universal access to all aspects of life. In modern life, chemical
products can not be obtained almost anytime, anywhere. From the material
life such as clothing, food, shelter and transportation to the
spiritual life such as culture and art, entertainment and so on, all
require chemical products to serve them. Some chemical products play an
epoch-making role in the history of human development. Their production
and application even represent a certain historical stage of human
civilization.
As a category of knowledge, chemical industry has many kinds of
decomposition or comprehensive classification methods in different
historical periods and under different demands. According to the source
of raw materials, product classification, but also in accordance with
the law of history, history classification. Each division method is
difficult to strictly adapt.
Among them, the oil refining industry is to create a higher output value of the industrial sector is the country's important economic lifeline. Natural gas is often symbiotic with petroleum and natural gas chemical industry is often attributed to petrochemical industry. At this stage, oil refining and petrochemicals are the main fuel chemical industry. Products produced by the fuel and chemical industries include fuels and chemical raw materials, which are mainly organic chemical raw materials (except for the syngas used in the production of inorganic chemicals such as synthetic ammonia). Therefore, the petrochemical industry is also a major part of the basic organic chemical industry.
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Second, the incidence of the law observed that the law of the occurrence of stripe blight has three distinct peaks: the first peak period in early July, the cause of the disease is due to seedlings by the first generation of planthoppers harm, plant damage caused by the virus brought to the field The second peak period is from the end of July to the beginning of August. After the seedlings were transplanted to the field, they were caused by the second generation of planthoppers; the third peak appeared in the middle of August, and it was the third generation of the planthoppers and adults of Laodelphax striatellus. Due to poisoning.
Third, the occurrence characteristics of different rice cultivation methods and different transplanting time, different varieties, the incidence of different severity. 1 Live broadcast plots are heavier than transplanting plots; 2 barley straw live plots are heavier than wheat bran live plots; 3 early crop plots are heavier than late plot plots; 4 artificial transplant plots are heavier than machine plots.
Fourth, agricultural control
1. Selection of high resistance varieties: Selection of disease-resistant, fertilizer-resistant and lodging-tolerant rice varieties based on local climatic conditions is an important means to control the occurrence of stripe leaf blight.
2. Properly postponed sowing time: sowing date has a greater impact on the occurrence of striped blight, the earlier the sowing date, the seedlings are more vulnerable to damage by the planthopper. Therefore, the delay in the sowing date and the late sowing in appropriate period can significantly reduce the occurrence of diseases. Generally, the sowing period for dry farming is appropriate around May 15. Try to avoid the damage period of SBPH.
3. Adhere to the round-robin rotation, increase soil fertility, and improve soil mass structure, which can reduce the incidence.
4. Increase organic fertilizer, fertilize soil quality, appropriately control the amount of chemical fertilizers, and pay attention to the application of phosphorus and potassium fertilizers and silicon fertilizer to promote the healthy growth of rice and increase the resistance of rice plants to diseases.
5. Clear the weeds around the garden to reduce the source of infection. Weeds are important sites for Laodelphax striatellus activities. We must increase the removal of weeds from paddy fields and fields around rice fields in order to aggravate the habitat of Laodelphax striatellus, reduce the number of transitional hosts, and cut off the main chain to reduce the incidence.
V. Chemical Control
1. Chemical control is one of the important measures to effectively control the amount of fly hoppers and reduce the spread of germs. It is necessary to adhere to the pharmaceutical control strategy of “cutting off the drug chain and pest control†to control the number of Laodelphax and prevent the spread of germs.
2. Seriously combat insect field hoppers and effectively reduce the number of insects. Combining with the prevention and control of the first generation of planthoppers in the earliest stage of the wheat field, we organized professional teams to prevent and control the planthoppers and insects on the “four-sided†weeds. In the selection of pharmaceuticals, chlorfenapyr, dichlorvos and their admixtures should be the main choices. Appropriate dosage and water consumption should be used to ensure the control effect.
3. Pay close attention to prevention and control work in Putian and reduce opportunities for drug transmission. During the period from late May to mid-June, the adults of S. graminis gracilis migrated into the flooded fields. After the uncovering of the trampoline, the prevention and treatment should begin immediately. After the first medication, they should be controlled every 3 to 5 days. It is possible to use pesticides with a good degree, such as chlorfenapyr, and speedy pesticides, such as chlorimicarb, to prevent and cure, and to use medicines for getting rid of them 2 to 3 days before transplanting, so that they can be transplanted with drugs.
4. Control field hazards and reduce disease occurrence. After the rice was transplanted in mid-June, a generation of Laodelphax striatus migrated into the field. After the rice was planted, it should be immediately treated with drugs. After mid-July, combined with the control of other rice pests and diseases, the second and third generations of young larvae of SBPH are used to reduce the occurrence of diseases.
Authors: Luohe Town Agricultural Technology Station, Rudong County, Jiangsu Province
This volume seeks to reduce unnecessary crossings, a comprehensive classification of methods designed from the raw materials of fuel chemical branches; from the product of inorganic chemicals, basic organic chemicals, polymer chemicals, fine chemicals and other branches; from the common The branch of chemical engineering proceeding from the regularity of the process, and the comprehensive branch proceeding from historical development and horizontal linkages. Fuel chemical raw materials are oil, natural gas, coal and oil shale and other combustible minerals, so it is divided into petroleum refining industry, petrochemical, natural gas chemical, coal chemical and shale oil industry.
Occurrence and Control Measures of Rice Stripe Leaf Blight
First, the onset of symptoms in the initial performance of the yellow and green stripes from the heart began to appear, then gradually curled down the curve, dry plants gradually dwarf, leaves chlorosis, and finally the whole plant withered.
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