The cultivation of bean crops in greenhouses mainly includes kidney beans, kidney beans, and Dutch beans. The growth of legume vegetables absorbs more nitrogen and potassium and less phosphorus, but when phosphorus is deficient, the growth of plants and rhizobia will be poor, which will lead to less flowering and scarring, less seed grains and lower yield. Legumes are like nitrate nitrogen, ammonium nitrogen is black when the root is black. Rhizobium is reduced, leaves are not flat and will turn green. Beans and vegetables more than potash fertilizer, especially during the flowering and podging period, the amount of potassium absorption increased rapidly, and potassium should be paid attention during this period. The activity of legume rhizobia is related to trace elements such as boron and molybdenum. In the absence of these elements, the normal metabolism of plants will be affected.
The main points of fertilizer application are as follows:
1. Seedlings grown in nursery sheds are often transplanted using seedlings. The nutrient soil used for nursery should be selected from 2 to 3 years of garden soil without legumes. It is made by mixing 4 garden soils with 4 parts of decomposed horse manure and 2 parts of decomposed chicken manure. Infiltration of 2 to 3 kg of superphosphate and 0.5 to 1 kg of potassium sulfate. Soil pH should be neutral or weakly acidic, and soil acidity can inhibit the activity of rhizobia. In acidic soils, lime may be used to neutralize the acidity. When lime is applied, it should be mixed well with the bed soil. The amount should not be too much, the amount is large or the mixing is uneven, which easily leads to volatilization of burned seedlings and ammonia, resulting in gas hazards.
2. Base bean, kidney beans, Dutch beans and other legumes are mid-favorable crops. Although there are nodules, nitrogen fixation is weak. In the undeveloped rhizobia, it is necessary to use the available nutrients in the base fertilizer to promote plant growth and development. Generally, 5000 kg of organic fertilizer is used per mu, 20-35 kg of calcium phosphate, 100 kg of plant ash, and 0.5-1 kg of manganese sulfate. The amount of dwarf bean basal fertilizer can be appropriately reduced. The requirement of soil oxygen for soybean roots is high. Applying uncontaminated chicken manure or other organic fertilizers will increase the reducing gas in the soil, reduce oxygen, cause rotten seeds and premature root ageing, and have a great impact on the yield. Therefore, it is necessary to pay attention to selecting a completely decomposed organic fertilizer, and it is not appropriate to use too much nitrogen fertilizer as a seed fertilizer.
3, 20 to 25 days after sowing after sowing, when the flower buds begin to differentiate in legumes and vegetables, if there is no enough basal fertilization, and the symptoms of fertility deficiency are shown, the top dressing should be promptly applied. After 20 to 30% of diluted manure and urine per acre, about 1500 will be applied. In kilograms, 4 to 5 kg of potassium sulfate can also be added to every 1000 kg of diluted manure. Early application of topdressing increases yield, but applying too much nitrogen fertilizer at the seedling stage will make the beans leggy. Therefore, whether topdressing should be based on plant growth.
Generally dwarf beans are top dressing 2 or 3 times, and beans are top dressing 4 to 5 times. Each topdressing pure nitrogen 3 ~ 5 kg (equivalent to 7 ~ 11 kg of urea), potassium oxide 5 ~ 7 kg (equivalent to 10 ~ 15 kg of potassium sulfate), the last time the amount of nitrogen fertilizer is halved, the amount of potash fertilizer can also be halved or Not apply. When low-temperature geothermal fertilizer is applied, a certain amount of high-quality humic acid should be mixed, or replaced with high-quality water, so as to reduce the damage to the root system caused by the use of chemical fertilizer alone.
4. Apply 0.02-0.05% ammonium molybdate to the foliar dressing during flowering.
Tunnel Indicator Traffic Light
Tunnel indicating traffic lights
1. The red cross and green arrows are outdoor traffic lights:
The tunnel red cross green arrow needs to withstand the baptism of severe cold and heat, sun and rain, so the red cross green arrow shell produced by our Weimeimei is a sheet metal chassis, the sheet metal chassis is made of cold-rolled sheet, and the cold-rolled sheet has surface quality Good, non-reflective, anti-glare, fully enclosed, weather-proof, weather-proof, in line with IP65 protection level; with good stamping performance, excellent processing and other characteristics.
Products supported by cold-rolled plates are sturdy and durable, and have a long service life. The display box adopts the rear door opening method, and the LED display adopts the modular design of the unit, which can be repaired in the front. The structure is not only convenient for maintenance, but also has necessary safety precautions.
2. Electro-optical signs
With the economic development of various provinces and cities, the construction of highways connecting various regions has been gradually improved, and there are more and more long tunnels and extra-long tunnels. Road tunnels are enclosed spaces with limited traffic space and difficult air circulation. They rely solely on the original reflective traffic. Signs in the tunnel will quickly lose the reflective effect due to air, oil, dust and other impurities. In order to better indicate the traffic safety in the tunnel and overcome the impact of air pollution by the single-reflective film, the active light-emitting form is adopted, so There is an electro-optical sign.
Tunnel indicator traffic light,Tunnel red cross green arrow traffic light,Electro-optical traffic signs
Shenzhen Wide Way Optoelectronics Co., Ltd. , https://www.wdmtrafficlight.com