According to local conditions, the pre-emergence herbicide should be selected before the pre-emergence herbicide is selected. The residual effect period of the chlorpyrifos is short, and it is the first choice for the safety of the sputum. Soybean pre-emergence chemical weeding is not optional Kekele, Jinghecao, 2,4-D and so on.
Strict standards, scientific compounding liquid soy soy after sowing pre-emergence chemical weeding formula is: 48% chlorhexidine EC 70 ml + 59% acetochlor EC 100 ml + 70% fensulfuron soluble powder 2 g, water 30 Kilograms can be sprayed on an acre of land. When preparing mixed pesticides, first add the pesticides into the appliance according to the standard, then dilute the powder pesticides into mother liquor with a little water, add the equipment, and finally add the quantitative water. Do not add the water to the appliance before adding the liquid to prevent water. The medicine is not fully dissolved and the spraying is uneven, and the medicine is inferior.
Spray at the right time to ensure that the water is sufficient. Soybean can not be sprayed immediately after spraying to prevent drought. The spring breeze affects the efficacy, but it can't be too late. The correct method is: the lyrical plots are sprayed 3 to 4 days after the sowing, and the plots with poor grievances are sprayed 4 to 5 days before emergence. Therefore, when applying pre-emergence weeding technology, we must pay attention to sufficient water. Take the air-jet sprayer pulled by the agricultural small four-wheel tractor as an example. Its weight is 175~200 kg, equipped with high-pressure nozzle, and the forward speed is in the second gear. So that each tank can be sprayed with 6~7 mu to ensure the application. The amount of water is 30~35 kg. At the same time, depending on the soil moisture and climatic conditions, it is possible to refill the water at any time, 20~30 kg per mu to improve the efficacy.
Lamp accessories are various parts and accessories used to install, secure and connect lighting fixture. They play an important role, not only to ensure the normal operation of the lamp, but also to improve the use effect and aesthetics of the light.
There are many materials for making lamp accessories, generally speaking, there are metal, plastic, glass, ceramics, etc. Metal generally has a long service life, corrosion resistance, and should not be aged, such as iron product lamps, which have a long service life; Plastic lighting product have a short use time, a faster aging speed, and are easy to deform when heated; The service life of glass and ceramic lighting is long as well.
Nowadays, the lighting and lighting accessories industry uses metal materials as the most widely used base, generally used materials are zinc alloy, aluminum alloy, steel, stainless steel, etc. The use of technology is mainly electroplating, painting, oxidation and electrophoretic coating. With the current people to lighting accessories product performance requirements and environmental awareness improved, electrophoretic coating process has gradually become the preferred process for surface treatment of lighting accessories.
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