Insect-resistant cotton for preventing premature decay

Although the insect-resistant cotton controls the damage of bollworm, in recent years, the mulching of the plastic film and the frequent occurrence of high temperatures in spring and summer and the improper use of cultivation techniques have caused the premature decay of insect-resistant cotton to occur frequently, which has seriously affected the yield of cotton. The anti-premature cultivating technology of insect-resistant cotton is a new technology that is mainly researched for the premature senility in the production of South Central Yunnan, and integrates seed, fertilizer, water, chemical control and other links into a set of technical systems, and is operability. Strong, can effectively prevent premature aging, increase production.

First, prepare before broadcast

1. Selection of good varieties: select mid-early maturing cotton varieties with good yield, strong resistance to diseases and insects, good leaf function in late growth stage, and high potential for single plant production.

2. Bottom pouring water: cotton fields with insufficient bottom soil, 10 to 15 days before sowing, 60-70 cubic meters per mu.

3. Fertilizer fertility: medium fertility cotton field, combined with site preparation before planting base fertilizer, generally Mushi organic fertilizer 1-2 cubic meters, urea 15-24 kilograms, superphosphate 30-45 kilograms, potassium chloride 12-17 kilograms , Advocate the use of appropriate nutrient content of slow-control fertilizer, while mu application of 1 kg of borax and 1 kg of zinc sulfate.

4. Cultivated land: plowing more than 20 cm, deep-turning once every three years in winter (more than 30 cm).

Second, sowing technology

The average sowing date in the Central South Cotton Region is April 20-30, and the year of warming up can be advanced to April 15. Before sowing, 100-125 grams of trifluralin or acetochlor were sprayed and mixed with soil. The sowing rate of mu is generally 1.5-2 kg (conventional cotton) or 0.7-1 kg (hybrid). Sowing depth of about 3 cm. The average cotton planting density is 2500-3500, and the hybrid planting density is 1800-2200.

Third, seedling and bud period management

1. Putting seedlings, seedlings, and seedlings: When the cotton seedlings are unearthed, the seedlings are released from yellow to green, and the seedlings are quiescent after the seedlings, and 3-4 leaves of the true leaves are set.

2. Intertillage: Generally cultivating 2-3 times, it can be carried out after the rain. The depth of cultivating in the seedling stage is 3-5 cm, and the cultivating depth in the bud stage is 10-14 cm.

3. Fertilizer and Water Management: Generally no nitrogen fertilizer is applied at the seedling stage and no irrigation is required. If there is little rain, it can be irrigated in early June.

4. Simplified pruning: Preserve leaf branches, and buds are generally not pruned.

5. Control of pests and diseases: In the event of land emergence, tigers in the field may be controlled by furazomide. Anthrax and blight can be controlled by carbendazim. If there is cotton aphid after 3 leaf stage, cotton aphid can be controlled by acetamiprid or carbendazim. In the bud stage, spider mites use avermectin to control. During the budding period, the blind and stinking elephants must be rotated in the evening to control 50% acephate 20g or 2.5% kaffoldin 10g foliar spray on water.

IV. Management of flower and bell

1. Fertilization and Irrigation: Tillage urea is applied from early flowering to full flowering. The amount of mu is 12-15 kg. When 0-60 cm soil layer relative soil moisture content is less than 60%, combined with timely fertigation sufficient water.

2. Pruning: When the main stem blossoms, the top of the leaf shoots is knocked out once. On the 15th and 20th of July, the top of the main stem was hit once and 12-14 single fruit branches were left.

3. Chemical control: There is a long-changing cotton field, with an initial flowering period of 2-3 grams per mu, and a flowering period of 3-5 grams. The cotton field with a premature aging trend sprays 30 mg/liter gibberellin twice a mu during the booming period (late July and early August).

4. Control of pests and diseases: The main prevention and control of blind stinkbugs and cotton bollworm, mu 50% acephate 60 g or 2.5% kongfufen 30 grams of water 45 kg foliar spray control.

V. Boosting period management

1. Pruning: To rotten the bell, hit the old leaves, cut branches and invalid buds. The prosperous cotton fields and closed canopies caused poor ventilation in the middle and lower parts of the group. It was easy to form rotten bells and bells. The rotten bells should be promptly removed, old leaves destroyed, and empty branches and flower buds after September 5 should be cut off.

2. Chemical ripening: Before and after October 3 (20 days before frost), when the temperature in sunny days is higher than 20°C, from 9:00 am to 3:00 pm, 40% ethephon with 100-150 ml water for 50 kg Field spraying.

3. Picking: Generally, picking is best when the bolls are cracked for about 10 days. Picking is done once every 10 days. When picking, we need to remove the stagnation flowers, classify and sell or save, and strictly control “three wires” during picking and storage.

Virus Specimen Collection Tube

Inspection principle:
It can perform protein denaturation on fresh clinical virus samples to inactivate the virus, prevent secondary transmission of infection, and ensure the safety of transportation and testing personnel.
♣.Structural composition: Combination of cotton swab and transport medium (VTM).
♣. Product requirements:
The product should be airtight, avoid high temperature, avoid direct sunlight storage. It should be used in a clean, hygienic, pollution-free, and temperature-friendly environment.
♣, Storage conditions and validity period:
â‘ , the product should be stored in a clean, dry and ventilated environment,
②, the temperature is 5℃-35℃;
â‘¢, relative humidity <85%RH;
â‘£, product shelf life: 12 months.
♣. How to use
â‘  Before sampling, mark relevant information on the label of the sampling tube.
â‘¡. Sampling with the corresponding cotton swabs.
â‘¢ After the collection is completed, quickly put the cotton swab into the collection tube, break the part higher than the sampling tube, and tighten the tube cover.
â‘£. For the specific sampling method, please refer to the following:
a) Nasal swab Gently insert the sampling head into the nasal cavity, stop for a while and then slowly rotate to exit, immerse the collected specimen in the Xiangxiang solution, break the excess part and discard it, and tighten the sampling tube cover.
b) Pharyngeal swab: Wipe bilateral pharyngeal tonsils and posterior pharyngeal wall with the sampling head, immerse the collected specimen in the sampling solution, break off the excess part and discard it, and tighten the cap of the sampling tube.
c), Mycoplasma Chlamydia, Ureaplasma specimen collection
Male: Insert the sampling head into the urethra about 2cm and rotate, stay for a while and then exit, and immerse the collected specimen in the sampling solution.
Female: Wipe the mucus of the cervical orifice, insert the sampling tip into the cervical canal for 1-2 cm for sampling, immerse the collected specimen in the sampling solution, break off the excess part and discard it, and tighten the cap of the sampling tube.
♣. Precautions
1. After the virus is collected, the disposable sampling swab should be completely inserted into the preservation solution, so that the virus can be retained to the greatest extent possible.
â‘¡ The collected specimens must be sent for inspection in time.
â‘¢. It is forbidden to use products with damaged packaging and expired validity period to prevent pollution.
This single-use Virus Sampling Tube is used for in vitro diagnosis. It cannot be used for human or animal oral or external use. If swallowed, it may cause serious events; it is irritating to eyes and skin. If it is not splashed into the eyes, rinse with water.

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