The suitable sowing date should be considered comprehensively according to the local climatic conditions, the type of vegetables, the cultivation method, whether the seedlings are divided into seedlings, the appropriate seedling age, the seedbed type and the planting period. First of all, to determine the appropriate planting period, cucumber, zucchini, tomato, eggplant, pepper and other warm vegetables suitable for frost planting in the open field. Like cold cabbage, celery, rape and other vegetables, can be planted in the open field 20-30 days before the final frost . Early-cultivation of protected land, due to cold-proof insulation facilities, can be planted in advance than in open field cultivation. At the same time, it is necessary to consider the suitable seedling age of various vegetables. Under normal conditions of impotence, the tomato seedling age is 60-70 days, eggplant and pepper are 80-90 days, cucumber 30-40 days, and zucchini 20-25 days. Cabbage 70-80 days, celery 50-60 days. Seedlings are grown on an electric hotbed. The seedling age of cucumber is 28-35 days, tomato is 37-55 days, eggplant is 55-70 days, and sweet pepper is 55-70 days. After determining the colonization period, the sowing date is calculated forward with the appropriate number of days of seedling age. When the sowing period is determined, the conditions such as the fertility characteristics of the vegetables, the nursery facilities and the technical level should be considered flexibly, and the seeds should not be blindly planted early.
While determining the appropriate sowing date, determine the amount of seeding. According to the planting plan, the area of â€‹â€‹various vegetable seedbeds and seedbeds, and the number of seeds required are calculated. In order to ensure the number of seedlings, a safety factor of 30%-50% is required .
Source: China Agricultural Promotion Network
When Car Reflective Vest use the aluminum lattice reflective material, not only in a small angle (from the reflective warning vest wearer far away), reflective brightness is high, even at a large angle (from the reflective warning vest wearer closer ), it still has a good reflective brightness, so that the locomotive driver earlier identified roadside vehicle side of the staff, as soon as possible to respond to effectively prevent the occurrence of secondary accidents.
Reflective warning vests are made of high-visibility reflective material It can make the traffic police work smoothly in the night or special weather in order to reduce the rate of the casualties. it plays a special role in security especially in traffic engineering.When the motor vehicle fails, the driver needs to wear a reflective warning vest, and away from the faulty vehicle to prevent the occurrence of secondary accidents. This kind of reflective warning vest is mainly applicable to police, road officials, traffic commanders, road maintenance personnel, motorists, motorcycles and bicycles drivers, dark light workers and so on in one word, the local worker who needs to use light warning. Widely used in traffic engineering, shipbuilding industry, steel industry, machinery industry, oil industry, ambulance, parking lot, airport, traffic police and outdoor work or construction, plays an important role in good security warning .
According to reflective vest`s wearing [far distance discovers, near distance recognise" s character. It balances the big and small angle of optical performance. It has a large reflection angle.
Reflective warning`s reflection part of the vest is the use of lattice micro-rhombus type refraction and high refractive index of glass beads back to the principle of reflection, through the post-processing of advanced processing technology made. It can reflect the distant light back to the light. Both in the day or night have a good retroreflective optical performance. Especially at night, it can play the same high visibility as the day. The use of this high-energy reflective material made of safety clothing, whether the wearer is in the distance, or in the light or scattered light interference, it can be relatively easy to be found by the night driver.
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