First, choose the best varieties of vegetable farmers can use early varieties of red onion varieties, such as purple star, purple jade, purple research and other series of varieties. General yield of 5000 kilograms per mu, high yield up to 7500 kg.
Second, prepare seedbed nursery bed should choose loose soil fertility, strong water retention, 2 to 3 years did not plant onion, garlic vegetable plots. Each acre of Daejeon requires a seedbed area of ​​about 35 square meters, and a general amount of 0.5 kilograms. Before sowing, fully apply 1,000 kg of farmyard manure, apply 20-30 kg of compound fertilizer, and plow till the soil is finely grounded to make a 1.5-2 meter wide raft, which will be soaked with water.
Third, the appropriate period of sowing early seedling seedling growth period, resulting in seedlings are too large, seedlings easy to convulsions; seeding seedlings is weak, low resistance to cold, easy to die in winter. Therefore, we must master the best sowing time. Use dry seed sowing method, cover fine soil after sowing, it is better not to see seeds. After covering the soil, 33% of weeds can be sprayed with 100 ml per acre seedbed to prevent weed seedlings.
IV. Seedling management After sowing, cover a layer of wheat straw or shading net on the surface of the loquat, which is good for moisturizing, preventing high temperature and rain, and keeping the soil moist before emergence. When about 60% of the seedlings grow on the seedling bed, Can be removed cover, depending on the weather in a timely manner watering, to prevent the seedbed hardened, and can be combined with topdressing 1% of urea, through fertilizer and water regulation and cultivation of age seedlings. It is necessary to prevent the seedlings from growing too large, causing early convulsions, but also to avoid the delicate growth of seedlings, affecting the winter. Generally, the onion seedlings can be planted when they have 4 true leaves, a plant height of 20-25 cm, and a leaf sheath diameter of 6-7 mm.
Fifth, timely colonization and colonization should be transplanted according to the size of onion seedlings, so that its uniform growth, and remove large seedlings with leaf sheath diameter more than 8 mm and 3 mm below the seedlings and seedlings. Colonization is generally completed before the end of October and requires a daily average temperature of 4°C to 5°C. It takes about 30 days for the onion to regenerate from the colonization, so it is necessary to promote the growth of the root system well before the onset of cold, and prevent the freezing of the soil causing the dead seedlings. Planting density is generally about 20,000 planted acres, spacing 20 cm, spacing 15 cm, planting depth to not bury the heart (that is, the farmers commonly known as the "blue fork shares") as well. After the planting, it will be irrigated and the survival of onion seedlings will be promoted. Do not flood the field so as to avoid soil compaction.
-Operation system: windows XP(Best) or windows 7
-D-Maximum Scanning Depth: max. 250mm
-Multi-frequency: 5 segment frequencies
-Zoom: 10 ratio, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0
-Image gray scale: 256 level gray scale
-Cine Loop::max. 1024 frames
-Scann mode: B, 2B, B/M, M, 4B, 9B, ZOOM(Real-time zoom on B mode)
-Image processing: Pre-processing, after-processing, dynamic range, frame rate, line average, edge;
enhancement, Black/White inversion; Gray scale adjustment, contrast, brightness, γ revision.
-Measurement and calculation(human):
B mode: distance, circumstance, area, volume, angle, ratio, stenosis, profile, histogram;
M mode: heart rate, time, distance, slope and stenosis;
Gynecology measurement: Uterus, cervix, endometrium, L/R ovary;
Obstetric: gestation age, fetal weight, AFI;
Cardiology: LV, LV function, LVPW, RVAWT;
Urology: transition zone volume, bladder volume, RUV, prostate, kidney;
Small parts: optic, thyroid, jaw and face.
-Measurement and calculation(veterinary): Cattle: BPD, CRL, TD;
Horse: GA; Dog: GS; Cat: HD, BD; Sheep: BPD, CRL, TD
-Image store: by computer hardisk or USB disk
-Print: by USB laser/inkjet printers with computer
-DICOM3.0, medical digital imaging and communication
-3D image function(function): can get rebuilt 3D image by any probe
Ultrasound Box,BW ultrasound scanner,ultrasound box,black and white ultrasound box,ultrasound scanner
Guangzhou Sonostar Technologies Co., Limited , https://www.sonoeye.com