1 basic principles of potato fertilization In the seedling stage, the amount of fertilizers sucked by the potatoes is relatively small, until the hair growth period, the amount of fat absorption will greatly increase, until the initial stage of tuberculosis, the amount of fat absorption will reach the highest peak, since then, the amount of fat absorption will decline rapidly The amount of fertilizer needed in the middle and early stages accounted for more than 70% of the total amount of fertilizer absorbed by potatoes. When fertilizing, it should be based on the application of organic fertilizer, supplemented by chemical fertilizers, base fertilizer-based, top-dressing as an aid to the main elements of large quantities, supplemented by trace elements as the basic principle. In order to achieve the balance and standardization of fertilization, the pre-promotion, the mid-control, and the post-insurance should be implemented, and the N, P is mainly used in the early stage to promote the potato to achieve early-onset and fast-growing, and more branches can be made to achieve high yields. Effect. In the middle stage of potato growth, there is no need to apply fertilizer. The purpose is to control the length and length of potato stems and leaves, and to ensure that the potato tubers can be scientifically formed and gradually expand. In the later stages, the foliar spray should be carried out to prevent premature yellowing of the leaves of the potatoes, thereby accelerating the photosynthesis rate of the leaves, thereby providing sufficient nutrients for the growth of the potatoes. 2 Application of Potato Balanced Fertilization Technology In the new period, when planting potatoes, fertilization technology has attracted much attention. It directly affects the actual nutrients of potatoes and can provide appropriate fertilization services according to the different growth stages of potatoes. In this study, the full use of balanced fertilization techniques, mainly to the traditional blind fertilization gradually shift to the direction of quantitative fertilization, from the previous single fertilizer gradually to the direction of organic fertilizer, but also with the application of some chemical fertilizers, and then To achieve the purpose of increasing crop yield, saving fertilizer, improving quality, increasing income, and balancing soil nutrients. The following detailed analysis of the specific balanced fertilization technology. 2.1 emphasis on the application of base fertilizer In terms of dosage, the basal fertilizer usually accounts for 70% of the total fertilizing amount, and the applied basal fertilization is based on decomposed farmyard manure, and it is also used with certain N, P and K fertilizers. When fertilizing, if the plot produces 667m2 of 2000.0kg potatoes, 3200kg of decomposed organic fertilizer, 45kg of superphosphate, 18kg of urea, and 12kg of potassium sulfate should be applied. If the yield of the plot is higher, the amount of fertilizer should be increased. When fertilizing, the fertilizer should be applied to a position 4.5 cm away from potato seed potatoes to avoid burning. When the basal fertilizer is applied in the early stage, the organic fertilizer should be applied on the surface of the arable land. When applying the chemical fertilizer, the centralized furrow should be developed before planting, and the depth of the furrow is usually about 15.0 cm. 2.2 Scientific application of fertilizer When sowing, a certain amount of seed fertilizer should be applied, and ditch application method should be applied. The application of diammonium phosphate 7kg/667m2, the depth of application of seed fertilizer should be about 5cm deeper than the seed. Seeds and seed fertilizers should be separated and treated in a timely manner. If they cannot be separated, it is forbidden to carry seed fertilizer. 2.3 Early application of fertilizer In the potato seedling stage, the best fertilizer treatment should be timely, and the top N fertilizer application, according to the actual cultivation of cultivator soil, topdressing urea amount of 4kg/667m2; wait until budding stage, topdressing urea 7kg/667m2, potassium sulfate 8kg/667m2. The ditch should be opened at a distance of 4cm from the root of the plant, and the ditch or hole should be used. After fertilization is completed, the soil should be used to cover the area tightly so as to achieve the purpose of promoting early-onset seedling growth. After the potato blossoms, it is not necessary to top-dress in the rhizosphere, in particular, no nitrogen fertilizer can be applied. 2.4 Doing Foliage Topdressing Work During the period of tuber formation and expansion of potatoes, top dressing should be carried out on the leaves. The main use is to spray organic fertilizers to spray wet operation. The spraying frequency is 3 times to achieve the balance of nutrition and prevent the occurrence of late stages. Yellow leaf problem. When applying foliar fertilizer, ensure that each time 667m2 uses 35mL of Penshibao against 50kg of water, continuous spraying is applied with an interval of 8 to 10 days. 3 Conclusion In order to increase the economic level of potato cultivation and increase the output of potato cultivation, it will seek higher economic profits for growers. If we want to meet this goal, we should pay attention to the scientific application of balanced fertilization technology, set a scientific fertilization plan and fertilization program, and strictly control the fertilization parameters, so as to provide the necessary nutrients for potato growth. The application of potato balanced fertilization technology should be done with basal fertilization treatment, emphasizing early application of top dressing and foliar dressing, thereby increasing potato yield and quality, in order to provide more economic benefits for growers. Disclaimer: Some articles in this website have been transferred from the Internet. 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Lamp panel
The lamp panel is divided into ordinary infrared lamps (Dingyuan and Guanglei) and array lamps. The array camera is also divided into 1W, 2W and 3W. Therefore, when choosing infrared lamps, if it is an ordinary infrared lamp, try to choose Dingyuan and 3W array lamps. Since the appearance of infrared lamps is generally invisible, some cottage cameras are filled with Guanglei and 1W array cameras are filled with 3W array cameras. Therefore, try to choose a large brand when choosing cameras.
Maximum Aperture
The real value of the maximum aperture is to improve the light intake under low light conditions, so as to achieve the best exposure combination. In general, the ability to visualize the lens is not required for shooting landscapes. In addition, the lens caliber is not required for shooting landscapes except in particularly dark places. However, when the 70-200mm zoom lens is equipped with a 2-fold zoom lens to make the telephoto section become 400mm and AF is used for automatic focusing, it is better to choose a lens with the largest aperture of F2.8. Large aperture is conducive to accurate focusing in dark conditions. When shooting people with a large aperture lens, even in places where the light is weak, the handset can also use natural light to shoot. In addition, the lens with the largest aperture can bring fast shutter speed, so sports photography also needs a large aperture lens.
Another reason for requiring the lens aperture to be large is to be able to visualize the background freely and ensure the quality of visualization. When the aperture of the lens with the maximum aperture of F1.4 is reduced to F2, both the imaging quality and the blurring quality of the background are better than those of the lens with the maximum aperture of F2. Therefore, it is of great value to reduce the aperture of a large aperture lens by one stop. Any photographer should be good at using the lens.
focal length
The first thing to pay attention to when selecting a lens is the focal length of the lens. In fact, focal length is a matter of perspective. Different focal lengths and perspectives are different. In addition, users should be clear about what is the main purpose of buying lenses? Is it for scenery or people. As we all know, it is better to use a wide-angle lens when shooting landscapes, and a telescopic lens when shooting people. Therefore, you should first decide the focal length of the lens you want to buy according to the purpose of photography.
The best focal sections for shooting scenery are 24 mm wide angle focal section and 200 mm telescopic focal section (both are based on 35 mm specifications, the same below). When the wide-angle focus segment of the standard zoom lens evolves from 28mm to 24mm, the viewing angle becomes larger, and the range of scenery that can be stored is greatly expanded. Generally speaking, the maximum aperture of the lens is not required for shooting landscapes. If you are mainly shooting landscapes, a wide angle focal length of 24mm is basically enough when you select a zoom lens. As for the telephoto section, it must be at least 200mm. If the telephoto section is 300mm or 400mm, it is more ideal, and the degree of freedom will be greatly improved. The telephoto focus segment of traditional zoom lens is 300 mm, which is 450 mm for digital SLR. The focal length has been expanded by 1.5 times, which makes it more enjoyable to use. This is the value of digital SLR. The wide-angle focal section of the digital special ultra wide-angle lens produced is generally 12mm, equivalent to 18mm of 35mm, which is nearly 1.5 times larger than the 28mm focal section of 35mm, thus greatly widening the left and right range of the scenic scene.
The best focal length for shooting people is 85mm. In terms of 35mm standard, 85mm focal length is basically used as the standard for shooting characters. The portrait taken by the 85mm focal section is basically close to the picture effect taken by the medium frame camera. It is not only suitable for the distance, but also the face of the person looks very natural. The distance between the camera and the person being photographed can basically be kept at the normal speaking distance. The 85mm focal length can also effectively blur the background and prominent characters. In order to obtain good visualization effect, the lens with the largest aperture should be selected. The 85mm focal length is about 135mm on the digital SLR. Although the sense of distance of the shot is a little weak, it is basically OK, so the focal length of the person lens should be at least about 85mm.
A 100mm macro lens is enough for traditional SLR to shoot flowers. The 100mm macro lens can be used for equal magnification photography, which can make the flowers very large. However, when taking equal magnification photography or near equal magnification photography, due to the depth of the long focus scene, it is easy to shake, so anti shake measures should be considered when taking photos. From this point of view, 50mm macro lens is easier to use on digital SLR.