How to remove field weeds before sowing vegetables?

First, cabbage, rapeseed, radish, cabbage and leek cruciferous. Before sowing, the vegetable field was sprayed with trifluralin (37-80 g/mu) and mixed with soil for sowing. After sowing can be used before the seedlings pure 100-130 g/mu, acetochlor 50-90 g/mu. After emergence in the weed 3-5 leaf stage, application of net catch, stable kill, grass grass grams, cover grass can spray on the stems and leaves, can control grass weeds.

Second, celery, parsley, carrots and other umbelliferous vegetable fields. Controlling the damage of weeds at the seedling stage is the key to chemical weeding in this kind of vegetable field. The main method is to use the trifluralin-purification agent (37-80g/mu) to spray the soil after spraying, and to control the annual grass weeds. Before sowing can be used before herbicide ether pure 200-250 grams / mu spray, or Shi Tianbu 125-150 g / mu pure spray, control broadleaf weeds and grass weeds. Carrot field before sowing can also be used before the seedlings 200-330 grams of pure ether / mu, legume 130-260 grams / mu. After the emergence of vegetables can be used to take net, stable kill, grass weed, gai grass energy.

3. Solanaceae vegetable fields such as peppers, tomatoes, eggplants, and potatoes. General eggplant, tomato, pepper can be used before the colonization of tetraflualine pure 40-60 grams / acre, dimethoamine 50-80 g / acre, Penicillin 50-60 g / acre spray mixed soil after colonization. After the planting, use a net to catch, steady kill, etc. for spraying. The potato can be used 200-300 g/mu of propachlor before transplanting, and it should be planted after soil mixing.

Magnetic Bead Acid Nucleic Extraction Kit

In order to implement the requirements for the prevention and control of the new coronavirus pneumonia epidemic, all parts of the country are actively cooperating in the normalization of epidemic prevention and control. Each city has arranged multiple nucleic acid testing sampling points, and requires a negative nucleic acid test result within a few days. Public places are accessible, and the importance of nucleic acid testing for epidemic prevention and control is self-evident.
As of now, there are 13,000 medical and health institutions in the country that can carry out nucleic acid testing, and 153,000 professional and technical personnel are engaged in nucleic acid testing technology. The nucleic acid testing capacity has reached 57 million tubes per day. In order to help the prevention and control of the new crown epidemic, Yisheng Biology quickly launched the nucleic acid extraction reagent + 96-channel automatic nucleic acid extraction instrument. It only takes about 10 minutes to extract 96 nucleic acid samples at one time, and extract nucleic acid in a faster and more accurate way. Work becomes more efficient.
Magnetic Bead Swab Sample Viral DNA/RNA Extraction Kit can be used to isolate and purify high-quality viral DNA/RNA from various swabs and virus culture supernatants. By using magnetic beads with unique separation function and carefully optimized buffer system to efficiently capture the released nucleic acid, the extracted nucleic acid has high yield and good quality, which is suitable for various downstream application experiments, such as RT-qPCR, qPCR and other experiments.

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