Aluminum Spiral High Speed Door
The Spiral door offers high-speed operation for high-traffic situations and rigid aluminum slat construction that eliminates the need for a second security door. Crisp lines give the Spiral door a stylish look that's great for many types of commercial, automotive retail, government, institutional and industrial applications. The Spiral is ideal for automotive dealerships, government, parking and security. Benefits No metal-to-metal contact reduces wear on the door panel and offers fast, quiet operation.
Aluminum spiral High Speed doors are usually used wherever goods traffic occurs and where the doors have to fulfill special requirements. In the food and beverage industry, or Medical industry for example, special climatic conditions have to prevail; short opening and closing times reduce cooling loss, avoid airflow and enable a smooth operating procedure. They can also be designed in larger dimensions for the mining and aircraft industries.
Aluminum Spiral High Speed Door,Simple Hard Fast Door,High Speed Spiral Door,Metal Hard Fast Door Shenzhen Hongfa Automatic Door Co., Ltd. , https://www.selfrepairinghighspeeddoor.com
First, look at the fertilization
It is suitable for the type. Although crops require 16 nutrients, different crops require different amounts of various nutrients. Leafy vegetables mainly supply leaves of vegetative bodies. Therefore, the effect of applying nitrogen fertilizer is obvious, the leaves are green and the color is bright. In addition to nitrogen fertilizers for fruits and vegetables and melons, phosphorus and potassium fertilizers need more. It should be noted that a large amount of organic fertilizer is applied. Legumes can fix nitrogen through root nodules, and should apply less nitrogen fertilizer.
It is suitable for the growth period. The crops need different amounts of various nutrients in different growth stages, and the amount of fertilizer applied should also be different. For example, in fruits and vegetables, reproductive growth has begun at the same time as vegetative growth, and there is a great relationship with fertilization in the period when flower buds begin to differentiate, flowering results, and fruit enlargement. Vegetable farmers should pay special attention to the problem of heavy fertilizer application during fruit expansion. For cabbages and other cabbage-like vegetables, in addition to paying attention to organic fertilizer as the base fertilizer, seedlings should be applied to promote seedlings to strengthen the seedlings. The use of heavy fertilizers to promote the expansion and firming of the ball.
Second, look at the days of fertilization
The main climatic factors affecting fertilization are temperature, rainfall and light. When the temperature is high, the crop grows vigorously, requires a lot of fertilizer, and is beneficial to the decomposition and transformation of the fertilizer. Therefore, the fertilizer can be applied more in the season of suitable temperature, and less or not in the low temperature season. Soil moisture conditions have a great impact on fertilization. When there is suitable water in the soil, it is beneficial to microbial activity and material decomposition; fertilization is not effective under drought conditions. When there is too much rainfall, not only will nutrient leaching, but also denitrification will be reduced to nitrite nitrogen due to poor soil ventilation, resulting in nitrous acid accumulation. Adequate light is conducive to photosynthesis and inorganic salt nutrition, and can also increase temperature and promote plant growth. In this case, more fertilizer is required. Therefore, when the water is suitable and the light is good, the fertilization effect is good.
Third, look at fertilization
There are many types of fertilizers used in vegetable production, each with its own characteristics. Organic fertilizers should be often combined with inorganic fertilizers to use organic fertilizers as base fertilizers or top dressings, while inorganic fertilizers are mostly used as top dressings. For some volatile fertilizers that need to avoid denitrification, such as ammonium sulfate, ammonium nitrate and other nitrogen fertilizers, it is best to apply deep. Phosphorus and potassium fertilizers are slow to move down in the soil, so that they are evenly mixed into the soil layer. For the top dressing of the roots, chemical fertilizers with pure quality and difficult to burn the leaves should be used. Leaf vegetables should avoid spraying nitrogen fertilizer to prevent nitrite accumulation.
4. Fertilize according to different cultivation methods
Due to different cultivation methods, the difference in fertilization amount is very different. For example, if the base fertilizer of the open field is applied with an organic fertilizer of 2,000 kg to 2,500 kg per mu, it is necessary to apply 4000 kg to 5000 kg when the mulch is covered with mulch and covered with plastic film. Summer sowing cucumbers have been fertilized by the former sorghum, applying only 2,500 kg to 3,000 kg of organic fertilizer per mu, and greenhouse cultivation of cucumbers in greenhouses has a maximum of 13,760 kg of high-quality organic fertilizer per mu.
Pollution-free vegetable science fertilization technology
In addition to pesticide residues and heavy metal residues, nitrite residues are also important indicators in the detection of pollution-free vegetables. Nitrite accumulation is mainly caused by poor fertilization habits. How to fertilize scientifically? To sum it up, it is “seeing fertilization, seeing fertilization, fertilizing fertilizer, and fertilizing according to different cultivation methodsâ€.
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