Bean medicinal control technology
Dry leaf deformity appeared in the beans near the corn field, which was caused by the spraying of herbicide drift in the corn field. Spraying herbicides in corn fields is mainly affected by wind, and the wind is farther away. Many vegetable farmers regard this medicinal disease as a disease prevention and control, which not only fails to achieve the proper control effect, but also delays the timing of prevention.
The symptoms are as follows: After spraying the herbicide in the corn field, the old leaves of the beans are dry and the stems are still green. With the growth of the beans, the new leaves are deformed and the leaves are shrunk. If the beans are in the pod-forming period, falling flowers appear. Plant growth is poor, which seriously affects yield.
There are several methods of prevention and treatment:
Flushing: The period during which the farmer sprays the herbicide is generally 7 to 10 days. During this period, the bean leaves are often sprayed with water to reduce the residual amount of the herbicide on the bean leaves. Timely topdressing: Topdressing is mainly based on ammonium bicarbonate or urea, and it can also be combined with some phosphorus and potassium fertilizers. The amount of top dressing should be determined according to the severity of the phytotoxicity and the growth of the beans.
Sufficient watering: timely watering after topdressing to promote fertilizer efficiency and reduce the relative concentration of harmful substances in the beans. Foliar application of plant growth regulators and foliar fertilizers: the effect of the mixture of 7500 times of liquid and foliar fertilizer is better. According to the degree of phytotoxicity, spray once every 10 to 15 days, and spray 1 to 3 times.
Guide Ring is a mechanical seal, also known as a guide ring. It is usually made of metal or plastic and used to support and position pistons or rods. Guide Ring has excellent wear resistance and corrosion resistance, which can effectively reduce leakage and friction, thereby extending equipment life. Guide Ring is widely used in the hydraulic, pneumatic, mechanical, and automotive industries as an important mechanical seal.
The classification of Guide Ring can be divided by material, structure, and purpose. According to material classification, Guide Rings are mainly divided into metal Guide Rings and plastic Guide Rings. Metal Guide Rings are usually made of metals such as copper, iron, and stainless steel, which have high strength, wear resistance, and high-temperature resistance; The plastic Guide Ring is usually made of polytetrafluoroethylene (PTFE), nylon, polyimide and other materials, with good corrosion resistance and low friction coefficient.
According to structural classification, Guide Rings are mainly divided into unidirectional Guide Rings and bidirectional Guide Rings. A unidirectional guide ring can only withstand pressure in one direction and is typically used in hydraulic and pneumatic systems; The bidirectional guide ring can withstand bidirectional pressure and is typically used in the mechanical and automotive industries.
According to usage classification, Guide Rings are mainly divided into piston Guide Rings and rod Guide Rings. The piston guide ring is usually used to support and position the piston, preventing friction and leakage between the piston and the cylinder liner; The rod guide ring is used to support and position the rod, preventing friction and leakage between the rod and the seal.
Wearing,Guide Ring,Guide Strip
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