Qingxian Greenhouse has become a new type of facility that leads the cultivation of vegetables in surrounding areas with a large area of ​​single sheds, low investment, and quick results. It is a spring-autumn plastic greenhouse with a full bamboo structure that was built and gradually promoted since 1984. The construction area of ​​a single shed is generally about 5 mu, 35-42 meters wide and 90-100 meters long. The shoulder height is 1.7-1.8 meters and the ceiling height is 3 Meter. The facility has the advantages of high land utilization, stable performance, and significant benefits, and is praised by the Ministry of Agriculture as the “green county shedâ€. This greenhouse is mainly cultivated in the local area in early spring. Now we introduce their cultivation experience to everyone.
The local vegetable farmers chose Tianjin Deruite 117, 507 and Liangyou 3000 varieties. The melons were bright and the melons were short. Usually sowed on January 20-30, in early March, cucumber two leaves as one, when up to three true leaves colonization.
Before commencing colonization, we should deal with soil treatment of greenhouses. We can use the ground fungus in the sand to spread deep into the ground. Mushi compost chicken manure 6-8 cubic meters, 50 kg of diammonium phosphate, 50 kg of potassium sulfate, and 100 kg of biological bacterial fertilizer applied in the planting hole, to prevent replantation of dead seedlings.
Open a ditch when planting, generally 35 cm to put a seedling, first hit the medicine and then watering. Drugs can choose DuPont Ke Lu 600 times, 500 times chlorothalonil solution, spraying the back of the key spray, 60% -70% stained with liquid on the line. If planted at the beginning of March, it should be poured with small water (can be poured with a kettle). Formally pour the first water after 5-6 days and mark the loose soil in 3-4 days after watering.
When the plant grows to about 10 leaves, 45% chlorothalonil smoke can be used to prevent diseases, and smoke once every 10-15 days. Pay attention to snoring and remove root melon in time.
Some local farmers have increased their income from the end of April to the beginning of May. When the temperature of the shed reaches 25°C-28°C, the beans, green dragons and other bean varieties of the cultivar between the rows are interplanted and the spacing is about 50 cm. Or at the end of July, cucumbers are grown after the cucumber has been pulled, and Zhongza 9, L402 and other varieties can be selected.
pharmacological action
Oxytetracycline has broad-spectrum antiviral effect on microorganisms. It is a rapid bacteriostatic agent. It has bactericidal effect on some bacteria at high concentration. Its mechanism is that the drug can specifically bind to the a position of ribosomal 30S subunit and prevent the connection of aminoacyl tRNA at this position, so as to inhibit the growth of peptide chain and affect the protein synthesis of bacteria or other pathogenic microorganisms. Oxytetracycline has strong antibacterial activity against Staphylococcus aureus, pneumococcus, Streptococcus pyogenes, Neisseria gonorrhoeae, meningococci, Escherichia coli, aerogenic bacteria, Shigella, Yersinia and Listeria monocytogenes; In addition, oxytetracycline also has strong effects on Rickettsia, mycoplasma, chlamydia and actinomycetes. [3]
Pharmacokinetics
The oral absorption of oxytetracycline hydrochloride is incomplete (about 30% - 58%), and the distribution volume is about 0.9-1.9l/kg. After a single dose of 1g, the peak blood concentration was about 3.9mg/l. After absorption, the drug is widely distributed, which can penetrate into pleural effusion and peritoneal effusion, or enter fetal blood circulation through placental barrier, but it is not easy to pass through blood cerebrospinal fluid barrier, so the drug concentration in cerebrospinal fluid is low. Oxytetracycline can also be distributed in liver, spleen, bone marrow, bone, dentin and enamel, and the drug can also reach a high concentration in milk. The binding rate of oxytetracycline protein is about 20% - 35%. The half-life of patients with normal renal function is 6-10h, the half-life of patients with renal insufficiency is prolonged, and the half-life of patients without urine can reach 47-66h. Drugs are mainly excreted through glomerular filtration, 70% of the dosage can be excreted within 24 hours of administration, and a small amount of drugs are excreted through bile and feces. Hemodialysis can remove 10% - 15% of drugs. [4]
indication
1. Oxytetracycline can be used as an optional drug for the treatment of the following diseases:
(1) Rickettsia disease, including epidemic typhus, endemic typhus and tsutsugamushi disease; [3]
(2) Mycoplasma pneumoniae infection; [3]
(3) Chlamydia infection, including psittacosis, inguinal granuloma (venereal lymphogranuloma), nonspecific urethritis, salpingitis and trachoma; (4) Regressive fever; [3]
(5) Brucellosis (in combination with aminoglycosides); [3]
(6) Cholera; [3]
(7) plague (combined with aminoglycoside drugs); [3]
(8) Rabbit fever. [3]
2. Oxytetracycline can be used to treat tetanus, gas gangrene, Yasi, syphilis, gonorrhea and leptospirosis allergic to penicillin antibiotics.
3. Oxytetracycline can also be used to treat respiratory tract, biliary tract, urinary tract, skin and soft tissue infections caused by sensitive bacteria. [3]
4. Oxytetracycline can also be used in the treatment of acne. [3]
contraindication
Allergic to oxytetracycline or other tetracyclines. [3]
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