1. Soil type: including soil composition, acidity and alkalinity. The higher the organic matter content in the soil, the more the drug is adsorbed. Therefore, the amount of the herbicide used in different soils is different. The acidity and alkalinity of the soil have an effect on the stability of the herbicide and the sensitivity of the plant to the agent.
2, soil moisture: it has a greater impact on the efficacy of the drug, such as simazine and other drugs in the relatively humid conditions, easy to play, if the soil is dry and use the cable effect.
3, temperature: temperature affects the penetration and conduction speed of the drug, which affects the efficacy of the drug. Generally, the herbicide is better at temperatures above 20 °C.
4, air humidity: air dry when used, weed pores closed, low efficacy, and vice versa.
5. Soil microorganisms: Long-term use of a single herbicide increases the number of microorganisms that decompose the agent in the soil, thereby shortening the residual period.
The mechanical screw was the first parallel threaded drive screw used in ancient clocks and firearms. In 1900s, it was the king of small, inexpensive, low end Screws and fasteners. Machine screws have changed a lot over the past 100 years; unless the screws are very small or small in number and not optimized, the threads are rolled up and will not be cut. In addition to the miniature screws, the screw head and driver are cold-forged again.
Head and drive type machine screws have a variety of drives and heads to choose from. The most popular heads are Pan and Countersunk, although there are various types of heads to choose from. These include slotted, Phillips, Pozi, hexagon wrench, hexagon wrench, Torx hexagon star, square drive socket head and safety head, easy to assemble but difficult to disassemble.
Mechanical Screws Application Mechanical screws are used to attach parts to machines, mechanical tools, and have many functions in telephones, electrical appliances, electronic equipment, and vehicles.
Mechanical screws low-strength steel, brass, aluminum and stainless steel.
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