From autumn to early winter last year, the weather in the Youjiang River Valley and other mango producing areas in Guangxi Province was warm and dry with little rain and sufficient sunshine. The photosynthesis, nutrient accumulation and flower bud differentiation of mango autumn shoots were extremely favorable. It is expected that the flower buds of mango trees in our region will be widely differentiated this spring. Well, the amount of flowers is larger. In order to ensure the quality of mango blossoms and improve the fruit setting rate, it is recommended that the management of mangoes this spring should include the following technical measures: First, timely sparse flowering trees with an apical flowering rate of 80% or more should be cleared early to preserve about 70% of the total. Grades are inflorescences, and other inflorescences are removed from the base when they are 5-10 cm in length. For larger inflorescences, it is better to cut off one-third to one-half of the lateral pedicels in the base to reduce the amount of flowering. The effect of tree nutrient consumption on fruit set. Second, timely top-dressing on the amount of flowering mango trees in the late flower to Xiehua time to top dressing. Apply 0.15-0.25 kg of urea per plant, or 0.25-0.5 kg of compound fertilizer, or add 0.5% of urea, 0.2-0.3% of borax and 0.2-0.3% of potassium dihydrogen phosphate in combination with spraying. The vigor is weaker. Trees can be added at the same time 50-100 mg / liter gibberellin, etc. for foliar spray. Third, pest control 1, mango anthracnose flowering and young fruit spray every 7-10 days. The main drugs are: 1:1: 100 Bordeaux mixture, 30% copper oxychloride, 12% green copper, 50% carbendazim, 70% thiophanate-methyl 800-1000 times, 75% chlorothalonil or 80 % Anthraquinone Fujian 500-600 times, 65% on behalf of Zinc or 40% Wei Wei Wei 400 times, Shi Baoke 500-1000 times. 2. Mango powdery mildew sprayed once before the flower buds germinating, once Bacillus thimble agent of 0.3 Baume degree or spraying powdery mildew at flowering fruit stage. The medicine used is: 50% sulfur rubber suspension 200-400 times liquid , 40% extermination Wei Wei 400-600 times liquid, 20% powder rust 1500 times, 50% carbendazim 500 times, 700 thiophanate-methyl 1000 times. 3. Mangosaurus horizontal stripes tailworm (also known as borers or cockroaches) spraying control during inflorescence germination, spray once every 7-10 days, continuous 2-3 times. The main agents are: 90% trichlorfon 500-800 times, 80% dichlorvos 800 times, 255% enemy killed 3000-4000 times, 40% Le Siben 1500 times, 50% efficient eradication of 2000 Double fluid. 4, mango citronella leaf pods need to pay close attention to insects during the flowering period, once found that spraying control. The main insecticides used were: 20% Yefensan 1000 times, 10% Seperoe, 20% extinction, 25% enemies, and 255% kung fu 2000 times. Spray once every 7-10 days for 2-3 consecutive times.
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.
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.
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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