According to the characteristics of soil fertilization and the fertilizer requirement of corn, the amount of fertilizer was determined, and the operation of nitrogen was used to control the phosphorus, potassium and medium and trace elements. Spring corn is applied with 2-3 tons of organic fertilizer per mu as base fertilizer. Large ridge double row or protective tillage should increase the level of fertilization.
According to the characteristics of soil fertilization and the fertilizer requirement of corn, the amount of fertilizer was determined, and the operation of nitrogen was used to control the phosphorus, potassium and medium and trace elements.
(1) Base fertilizer. Under normal circumstances, 1/4-1/3 of total nitrogen in the corn and phosphorus and potassium fertilizers are all used as base fertilizer. Spring corn is applied with 2-3 tons of organic fertilizer per mu as base fertilizer. Medium and trace element fertilizers should be supplemented according to soil nutrient conditions.
(2) Seed fertilizer. Do not use too much. Fertilizers should not be in direct contact with the seeds to avoid burning.
(3) Topdressing. For plots with thinner ground forces, the amount of topdressing should be increased, and vice versa. For hi-fertilizer varieties, such as Si Mi 25, Tongji 100, etc., the amount of topdressing should be increased to give full play to the potential for increasing the yield of varieties; for varieties with high tolerance, such as Si Mi 21 and Jidan 180, the amount of topdressing should be appropriately reduced. The amount of early-maturing varieties is less than that of late-maturing varieties. The varieties with high tolerance should increase the amount of topdressing, such as Zhengdan 958 Xianyu 335; large ridge double-row or conservation tillage should increase the level of fertilization. Spring corn topdressing should be applied in three times in the light, medium and heavy, and then supplemented. The first application before and after jointing, accounting for 30%-40% of the total amount of nitrogen topdressing; the second time in the big bell mouth period, accounting for 40%-50% of the total amount of nitrogen topdressing for the third time in the flowering pollination period, It accounts for 10%-20% of the total amount of topdressing. In addition, the sandy soil should be topdressed several times; when it is dry, try to topdress before the rain; it should be topdressed in the field, and the seedlings should be topdressed; Increase the application of phosphorus and potassium fertilizers; in the year of low temperature chilling, early application of nitrogen fertilizer should be applied, and appropriate amount of phosphorus and potassium fertilizer should be applied.
Industrial sectional doors are the most durable and longest lasting doors to ensure circulation at the areas of the factory entrance and exit of goods, loading and unloading areas.
The body of sectional door is forming by 40 mm sandwich panels. These panels provides sound and heat insulation due to the intense doped polyurethane insulation was injected between galvanized steel sheet. (50 kg/m3).
Industrial sectional door systems provide space-saving with opening parallel to the ceiling.Any opening can be used clearly . and produces in accordance with the transition range and the height in the factory buildings or warehouses.
Doors is working sliding by be the most appropriate the gap between the top level of the gate with a ceiling height within the side rasils. The door can be mounted in different ways according to the gap distance (standard, low, highlift and vertical track systems).
Industrial sectional doors can easily be opened automaticly by 230-380 V-AC/50 Hz electric motor or manualy thanks to torsion spring system that balances the weight of the door.The galvanized springs are made to be durable of 25.000 door cycles.Motor with emergency chain All the drive systems have a mechanical back-up system fitted to the reduction gearbox of the electric motor, so that the sectional door can be opened if the power fails. The reduction gearbox can then be powered using the chain.
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