In recent years, the cultivation ratio of rapeseed and transplanted cotton in Haimen City has been increasing year by year. Due to the delay in the planting period, the proportion of autumn peaches is high, and the yield and quality are lower than that of wheat and bean-covered cotton. In order to ensure early high-yield rapeseed transplanted cotton, the management concept of early-to-late competition should be adhered to, and the following technical measures should be taken actively. Raising seedlings should use early-maturing varieties and early seedlings to ensure that they can be harvested before and after May 25 to facilitate early transplanting of cotton. Cotton should use high-yield, disease-resistant, high-quality middle-early early varieties, sowing date is about 10 days later than wheat set transplanting cotton, usually sunny sunny assault sowing on April 10-15, 2 to 3 days before sowing Species. The focus of seedbed management is to prevent emergence of high-ill seedlings, which can be sprayed with 1.24% flavonoids and methylphenidate before and after the distraction of cotton seedlings, and appropriate cooling and stimulating after the 2 leaf stage of cotton seedlings. 15 days before transplanting, transplant the seedlings before transplanting. Adjust the seedlings before transplanting. Move gently and gently. Move the seedlings on the edge to the middle and transfer the middle seedlings to the edge. Head seedlings and empty. After relocation, it is necessary to make up mud, replenish water, and supplement fertilizer. After applying 1.5 kg of urea per 18 to 20 m2 of seed bed, water it, or pour appropriate amount of thin excrement into human urine, cover the membrane to warm it, and open up the vent. During the rapeseed harvest, sunny day transplanting cotton seedlings was grasped, so that transplanting was done while harvesting. For the fertility characteristics of late-planting, late-maturity and late-maturing of rapeseed-transplanting cotton, the planting density was appropriately increased, and the cotton was planted with 1800-2000 strains per mu. Planting spacing of 1 ~ 1.2 meters, the size of the seedlings were planted separately, after the planting feet poured water to live trees, repairing the trenches in the field to prevent waterlogging. Covering the mulching film to transplant cotton can increase the temperature and protect the earthworms, prevent the growth of young plants, and fight for early-onset effects. Daejeon mainly promoted the growth of the early stage, timely spraying foliar fertilizer, Lei Lei rear view of the situation with methotrexate to promote strong. The growth period of rapeseed and cottonseed transplanted cotton was late, and the occurrence of pests in the middle and later stages was heavy. It was necessary to focus on the control of insect pests such as Bemisia tabaci, Blind stinkbug, Cotton bollworm, Spodoptera litura, Aphids and Red spider.
We may have heard of the Dome Fixed Focus Camera/ Fixed Focus Dome Camera/ Fixed Focus Dome cameras/ Fixed Focus Digital Dome Camera/ Fixed Focus Dome Camera Amazon/ Fixed Focus Dome Camera CCTV, so what is the Dome Fixed Focus Camera? We know that the dome refers to the camera shape, so what about the Fixed Focus? Actually, the Fixed Focus refers to a type of the camera lens. Today let me introduce the camera lens for you.
Last time, I have introduced the camera lens and one classification for you. Today please let me introduce the 2nd classification for you---the classification according to the occasions.
In conclusion, we can choose rake the angle of the view into consideration according to our needs, when we choose a Dome Fixed Focus Camera.
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1. The standard lens
The lens with the angle of view at about 50°(which is also the angle that a person can see without turning his head and eyes), is called the standard lens. The focal length of the 5mm camera's standard lens is mostly 40mm, 50mm or 55mm. The focal length of the 120 camera's standard lens is mostly 80mm or 75mm. The larger the CCD chip is, the longer the focal length of the standard lens will be.
2. The wide-angle lens
The wide-angle lens has the angle of view at above 90 degrees, which is suitable for shooting close and large-scale scenery, and can deliberately exaggerate the foreground to show a sense of perspective. The typical wide-angle lens of the 35mm camera has a focal length at 28mm and an angle of view at 72°. The 50mm, 40mm lens of the 120 camera is equivalent to the 35mm, 28mm lens of the 35mm camera.
3. The long focal length lens
The long focal length lens is suitable for shooting distant subjects. The small depth of field can easily make the background blurred and the subject stand out, but it is bulky and the difficult to focus on the dynamic subjects. The long focal length lenses of the 35mm camera are usually divided into three levels, 135mm or less is called the medium focal length, 135-500mm is called the long focal length, and above 500mm is called the super long focal length. The 150mm lens of the 120 camera is equivalent to the 105mm lens of the 35mm camera. The long focal length lens has the telephoto lens design because it is too bulky, that is, a negative lens is added to the lens behind , and the main plane of the lens is moved forward, then a shorter lens body can be used to obtain the long focal length effect.
4. The reflective telescope lens
The reflective telescope lens is another design of the super telescope lens, which uses a reflecting mirror to form an image. However, due to the design, the aperture can't be installed, and the exposure can be adjusted only through the shutter.
5. The Macro lens
The Macro lens can not only do the close-up macro photography, but also do the telephoto.
