The fundamental difference from traditional electric scooters, battery scooters, bicycles and other transportation tools is that electric wheelchairs have intelligent operating controllers. According to the different operation methods, there are rocker-type controllers, and controllers controlled by various switches such as the head or blowing system. The latter is mainly suitable for severely disabled people with upper and lower limbs. Nowadays, electric wheelchairs have become an indispensable means of transportation for the elderly and the disabled. It is suitable for a wide range of objects. As long as the user has a clear consciousness and normal cognitive abilities, the use of electric wheelchairs is a good choice, but it requires a certain amount of space for activities.
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Crop fertilization methods are those
First, basal fertilizer is applied before sowing, also called base fertilizer. There are two main aspects of the application of basal fertilizers. One is to fertilize the soil and improve the soil. The second is to continuously provide nutrients for crop growth. Fertilizers used as base fertilizers are suitable for organic fertilizers and slow-release fertilizers, such as manure, compost, and phosphate rock meal. Phosphorus and potassium fertilizers are generally used as base fertilizers and are applied together with organic fertilizers. The quick-acting nitrogen fertilizer should not be used excessively to avoid the loss of nutrients. At the same time, it will also make the crop grow too prosperous at the beginning and it will be susceptible to pests and diseases. Base fertilizer consumption accounts for most of the total fertilizer consumption. The specific application should also be based on the type of crop, soil conditions, farming methods, the amount of basal fertilizer and fertilizer properties, using different methods of application. 1, spread method. That is, before the crop is sown, the fertilizer is evenly spread on the surface and then ploughed into the soil. The fertilization method is suitable for crops with high planting density, such as wheat and rice. This method has a large amount of fertilizer and is very beneficial to the overall improvement of soil fertility. 2, Shi He points cast. Refers to the combination of site preparation before planting, ditching or opening a hole, and applying the fertilizer into the soil after sowing. Suitable for drilling or hole sowing (fruit tree) crops. This is concentrated fertilization, fertilizer effect is higher. However, it should be noted that the concentration of fertilizer should not be too high, and the organic fertilizer used should be adequately cooked. 3, layered fertilization method. According to the nature of the basal fertilizer used in combination with deep ploughing, the delayed-effect fertilizer is applied to the lower layer and the upper layer is applied to the quick-acting fertilizer. The fertilizers in each layer should be distributed evenly. This fertilization method can meet the needs of the nutrient when the roots of the crop are elongated, and the growth period is long. Deep root crops are more effective. Second, Fertilizer Fertilizer applied in crop sowing, tuber cultivation or transplanting seedlings, the purpose is to provide the necessary nutrients for the cultivation of strong seedlings. Fertilizers generally use fast-acting nitrogen and phosphorus fertilizers or decomposed organic fertilizers because the fertilizers are in close contact with seeds or seedlings. Therefore, in the selection and use of fertilizers, the possible corrosion, burn, and poisoning of seed or seedlings by fertilizers should be prevented. Effects, such as the concentration of fertilizers, acid-base reactions, and the maturity of organic fertilizers. Fertilizer application methods are generally the following: 1, seed dressing method with a small amount of fertilizer and seeds mixed together sowing. The amount of seed dressing fertilizer is less, and when dressing seed, the fertilizer and seed should all be dry, with the accompanying sowing, the effect of increasing production is good. 2, soaking method with some fertilizer made of dilute solution, the seeds soaked for a certain period of time, remove the sowing. The treated seeds are more neat and robust in germination and emergence, and their stress resistance is enhanced, which is conducive to the increase of crop yield. However, it is necessary to strictly control the solution concentration and soaking time so as to avoid adverse effects on the seeds. 3, touch the root method. When the crops were planted and seedlings were planted, they were soiled with a certain amount of fertilizer, and they were planted with the soil with good results. If the sweet potato pods are soaked in wood ash, they can receive effective results. 4, cover fertilizer method. After sowing, cover the seeds with a certain amount of fertilizer and use organic fertilizer. In addition to supplying nutrients to crops, fertilizers also protect lotus roots and heat and promote the early growth of crops. This method can be used when crops are interplanted or sowed. 3. Top dressing In the process of crop growth, fertilization measures are carried out according to the characteristics of the nutrient requirements of the crop at each growth stage. Under normal circumstances, mainly fast-acting inorganic fertilizers, long growth cycle and insufficient basal fertilizer, can make use of slow-effect fertilizers such as cake fat, decomposed quality circle dung, if you need phosphate fertilizer, you should choose water-soluble phosphate fertilizer. There are the following top dressing methods: 1. Spreading method. It is generally applied to crop plants with high density, where the root system is spread over the entire plough layer, and the amount of topdressing fertilizer is large. The uniform application is required and combined with cultivating, weeding, and irrigation and drainage. Salting method is simple and easy, but the utilization rate of fertilizer is not high, and economic efficiency is poor. 2, the method of casting. This method is applicable to seeded crops such as wheat, millet, etc. When topdressing, it can be cultivated and weeded first, then ditched between rows to apply fertilizer to the cover soil. The depth of fertilization should be compatible with the depth of crop roots. 3, point cast method. In the rows of large field crops between the lines of plants or rows of open space to apply fertilizer, such as peanuts, sweet potatoes, tobacco and other crops. This method uses less fertilizer and can reduce losses, but it is time-consuming. 4, ring cast. This method is used when fruit trees are topdressed. That is, an annular groove is opened around the trunk, the fertilizer is applied to the groove and then the soil is covered. The diameter and depth of the annular groove should be adapted to the area where the roots of the fruit tree are distributed. 5, spray method. The fertilizer is formulated into a solution of a certain concentration and sprayed on the leaves of the crop, which is also called extra-root fertilizer. The method has a wide range of applications, with a small amount of fertilizer, quick effect, and high utilization rate. When the crop suffers from symptoms of nutrient deficiency, it can be corrected by extra-root spraying.