A: Autumn crops mainly refer to winter crops such as winter wheat and winter rape in field crops. In addition, Chinese cabbage and other vegetables harvested from autumn to early winter, winter vegetables and fruit trees harvested in autumn need to be fertilized and integrated in autumn; spring spring wheat, potato and other early spring sowing crops should also be combined with deep harvest after the autumn harvest last year. Straw returning to the field and application of organic fertilizer.
The main features of autumn crop fertilization are: (1) Mainly based on base fertilizer. The base fertilizer before sowing or planting is required to be applied at an appropriate time, and is applied in combination with nitrogen, phosphorus, potassium fertilizer and necessary medium and trace element fertilizers with appropriate dosage and reasonable ratio. (2) Combined with soil preparation. Taking winter wheat as an example, the basic fertilizer for autumn application should be combined with improving the quality of land preparation and sowing, and comprehensive management should be carried out. (3) Prepare fertilizer. Soil preparation requires appropriate lyrics; organic fertilizer decomposing requires a time course; fertilizer requires appropriate dosage, nutrient distribution ratio and credible marketing channels. These require preparation in advance so as not to miss the time. This year, the country has a large area of ​​rain and lasts for a long time, but it is generally beneficial to autumn seeds and fertilization. All localities must take appropriate measures to harm them.
Q: How should winter wheat apply base fertilizer and topdressing in autumn?
A: For the winter wheat with a yield of 400-500 kilograms per mu in the Huang-Huai-Hai Plain, it is recommended to combine 1500-3000 kg of farmland fertilizer with 15-20-10, 15-20-10 and other medium-nitrogen high-phosphorus low-potassium compound fertilizer or 15-15-15. 25-35 kg of general-purpose compound fertilizer, or fertilizers such as urea, diammonium phosphate and potassium chloride, which are equivalent in nutrient dosage and ratio. If the straw is returned to the field, the amount of potassium fertilizer can be appropriately reduced, but 3 to 5 kg of urea should be added per acre. The top dressing is mainly from the beginning to the jointing stage. According to the local soil and seedlings, 15-20 kg of urea is applied once or several times. For the wheat in the arid regions of northwest China, the fertilization should be combined with the drought-resistant and water-saving techniques, and the seedlings should be plucked; the rice in the Yangtze River basin should be combined with the drainage and anti-caries technology of the Qinggou Sangou (boxing, gutter, and fur). Phosphate fertilizer should use calcium superphosphate or calcium magnesium phosphate fertilizer, and increase the proportion of potassium fertilizer.
Q: How should the winter storage of Chinese cabbage be applied to the base fertilizer and topdressing?
A: For the winter storage of Chinese cabbage with a yield of 6,000-8,000 kilograms per mu in the north, it is recommended to combine 3000 to 6000 kilograms of farmyard manure with a total of 40 to 60 kilograms of common ternary compound fertilizer, or 8 to 10 kilograms of urea. Ammonium 14 to 17 kg (or 40 to 55 kg of superphosphate), potassium sulfate or potassium chloride 15 to 20 kg. The topdressing is focused on the early stage of the package. In the rosette period, the pre- and mid-term application of the core, a total of 30-40 kg of urea is applied per acre. Spraying appropriate amount of calcium fertilizer and foliar fertilizer such as boron can prevent and cure the "dry heart" caused by calcium deficiency, and improve the yield and quality of commercial vegetables.
Q: How do you apply base fertilizer and topdressing to the apple tree in autumn? A: For the high-yield orchards in the fruiting period, it is recommended to apply 3,000 to 4,000 kilograms of farmer's fertilizer in the early period from mid-September to mid-October. For convenience, the amount of fertilizer applied can be calculated by plant. In the autumn, on the basis of farmyard manure, apply 20-10-10 per plant or 1 to 1.5 kg of general-purpose compound fertilizer, or combine the nutrient dosage with urea, superphosphate and potassium sulfate. There are two main top dressings: about 1 kg of 20-10-10 high-nitrogen-phosphorus-type compound fertilizer per plant before germination in March, or the application of nitrogen, phosphorus and potassium fertilizers with equivalent nutrients; flower bud differentiation period in mid-June That is, in the long fruit period, each plant applies 10-10-20 high potassium or general-purpose compound fertilizer 1.5 to 2 kg. For late-maturing varieties, high-potassium compound fertilizer or potash fertilizer can be applied as appropriate in early August. Appropriate spraying of calcium, iron, zinc, boron and other trace elements of foliar fertilizer can prevent and cure deficiency, which is conducive to high quality and high yield of apple.
(Senior Consultant of Sinofert, Professor of China Agricultural University Wang Xingren)
Farmers Daily
I System description:
Heat Shrinkable Tape is designed to protect the weld joint of buried or exposed steel pipelines and insulated pipeline. This sleeves are manufactured from high quality cross linked polyethylene material. Hot melt adhesive provides excellent adhesion with the surface of steel pipeline, PE coating. Meanwhile it forms a continuous and firm anti-corrosive system with the surface of the pipeline.
The Polyethylene Heat shrinkable Tape needs no primer nor patch closure and reduces application time and labour costs.
â…¡ Structure
The specification of the tape consists of three layers,
Adhesive: butyl rubber based hot melt adhesive
Film backing: Radiation crosslinked polyethylene
Interleaf:Antiadhesive Film Treated with Silicone
â…¢ Features
After heating, formed corrosion protection seal
Strong backing provides outstanding waterproofing effect
High chemical resistance. resists impact, abrasion and ultraviolet light.
Excellent resistance against cathodic disbondment, dielectric breakdown.
Simple Application
â…£ Physical Properties
· Product Data Sheet Total Thickness:40mil, 50 mil,60 mil ,65 mils.
· Width:50,100,150,300,400,500,800 mm
· Length: 10 m
· Tensile Strength:35 N/cm
· Elongation:400%
· Adhesion Strength to pipe:30 N/cm
· Application temperature: -10 -60 ℃
· Temperature resistance:-50 ℃ - 80℃
· Shelf Life: 12 months
â…¤ Application
No Special skills, equipments, patch closure nor primer are needed. Its superior flexibility provides easy and reliable application for irregular configurations of fittings, bends and elbows and small diameter of straight pipes
Wrap spirally the tape over foreign matters-free and preheated surface, beginning at least 25~50mm (1~2 ) onto pipe coating. Wrap the tape with enough tension to obtain conformability and with minimum 50% of overlapping, while removing the release liner. Warm the end part of the tape and press down firmly. Using a torch, start at the edge of the tape and heat circumferentially around the coated pipe.
Finish off by heating over the entire tape vertically to ensure a uniform adhesion and by using a roller or gloved hands to remove wrinkle and air.
VI. Technical Datas
Heat Shrinkable Tape
Heat Shrinkable Tape, Shrink Wrap Tape, Heat Applied Tape
Jining Xunda Pipe Coating Materials Co.,Ltd , http://www.pipe-wrap.com