Scientific fertilization reference program: 1 base fertilizer. According to the fertilization characteristics of cotton, combined with the current actual situation, the cotton field with a yield of 300-400 kg per mu generally applies 10 kg of urea per mu, 20 kg of diammonium phosphate, and imported potassium chloride (60% pure potassium content, 50% pure saline content in saline-alkali soil) % of imported potassium sulphate) 20 ~ 25 kg, or acre of NPK 15-10-15 compound fertilizer 50 ~ 65 kg, the general output per mu of the application of diammonium phosphate 20 kg, potassium fertilizer 20 kg or compound fertilizer 50 kg It can be combined with the application of zinc, boron and other trace element fertilizers of 1 to 2 kg per mu. It is better to apply more than 2 square meters of farmyard manure per acre. 2 topdressing. Phosphorus and potassium fertilizer is best applied as a base fertilizer at one time. Nitrogen fertilizer can be applied in the “three-seven-open†period in the stage of Shengli and Hualing. The same amount of fertilizer applied, and the application of nitrogen fertilizer in stages can increase the yield by 10% compared with “one-time topdressingâ€. about. 3 spray foliar fertilizer. Foliar fertilization is the most economical and effective fertilization method, which can promote plant stability, enhance disease resistance, insect resistance and anti-premature aging ability, significantly improve yield and quality, and have low cost and good effect. During the growth period of cotton, 0.5% potassium dihydrogen phosphate aqueous solution or a good helper high potassium foliar fertilizer can be sprayed with 0.3% high-enriched solution for 2 to 3 times. The effect is very obvious.
Source: Hebei Science and Technology News Author: Li Chang Bao, Wang Dongmei
Aluminium alloy is a type of metal that is widely used in various industries. This alloy is made by combining aluminium with some other metals, such as copper, magnesium, silicon, and zinc, to enhance its properties. The resulting alloy has improved properties than pure aluminum, such as higher strength, corrosion resistance, and good weldability.
One of the main advantages of aluminium alloy is its lightweight. It is about 1/3 the weight of steel, which makes it an ideal material for transportation applications, such as airplanes, cars, and trains. The alloy's high strength also makes it suitable for structural applications, such as in the construction industry.
The corrosion resistance of aluminium alloy is another benefit. Its protective oxide layer prevents rust and other forms of corrosion, making it an ideal material for outdoor applications, such as building facades, roofing, and window frames. The alloy's good thermal conductivity also makes it suitable for heat exchangers and other heat transfer applications.
Aluminum alloy also has a good aesthetic appeal. It can be easily shaped, welded, and fabricated into various shapes and designs. It can also be anodized or painted to provide a decorative finish.
In conclusion, aluminium alloy is a versatile material with many advantages. Its lightweight, strength, corrosion resistance, thermal conductivity, and aesthetic appeal make it an ideal choice for many applications.
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