New product of U85 micro laser distance sensors use highly focused class 2 laser to detect objects or measure distances, and can return a measured value via varieties intface( serial, usb, rs232, rs485, bluetooth etc.). The electronic distance sensor is a very small Laser Distance Sensor, but high resolution up to 1mm and long distance measuring sensor - teachable measuring range of up to 30m. Extremely accurate distance sensing sensors, errors down to ± 1mm. And the mini sensors and measurements support continuous measurement function, great for compact solutions(eg: robots) with the smallest Laser Distance Sensor of the world!
Parameters of U85:
Accuracy
±1 mm (0.04 inch)
Measuring Unit
mm
Measuring Range (without Reflection)
0.03-20m/0.03-30m
Measuring Time
0.1~3 seconds
Laser Class
Class II
Laser Type
620nm-690nm, <1mW
Size
41*17*7mm (±1 mm)
Weight
About 4g
Voltage
DC2.0~3.3V
Electrical Level
TTL/CMOS
Certifications
CE, FCC, RoHS, FDA
Operating Temperature
0-40 ℃ (32-104 ℉ )
Storage Temperature
-25~60 ℃ (-13~140 ℉)
Mini Laser Distance Sensor,Optical Laser Distance Sensor,Smallest Laser Range Sonsor,Laser Measuring Sensor Chengdu JRT Meter Technology Co., Ltd , https://www.cdlaserrangfinder.com
After harvesting Xifeifeichun tea, the tree nutrients are consumed in large quantities, the new shoots stop growing, and the root growth is strengthened. Therefore, it is necessary to fertilize the tree nutrients in time. According to experiments, 100 kg of dry tea is generally harvested from the tea garden and 10 kg of pure nitrogen should be compensated to maintain the original fertility level of the soil. If it is expected to produce 150 kilograms of dry tea per mu, 15 kilograms of pure nitrogen should be applied, of which 5 kilograms is used as base fertilizer and 10 kilograms is topdressing. Organic manure such as cakes, compost, manure, green manure, etc., or basal fertilizer every year or every other year, can be used for interlaced application, combined with phosphorus and potash fertilizers. In the fertilization of tea gardens, the frequency of topdressing may be more appropriate, so that the seasonal distribution of available nitrogen content in the soil is relatively balanced, and more nutrients can be absorbed at each peak of growth to facilitate the increase of annual production. Apply twice a year: 60% before Spring Tea and 40% before Summer Tea. 3 times per year: before spring tea, summer tea, and autumn tea, apply 40%, 30%, 30%, or 50%, 25%, and 25%, and the ratio of nitrogen, phosphorus, and potassium is 2 to 4 1:1. Usually, 15 kg of urea is used in summer fertilizers, 11.5 kg of common calcium or calcium magnesium phosphate fertilizer, and 7.5 kg of potassium chloride. In combination with tea plantation loose soil, we dig a deep 12 to 15 cm deep at the outer edge of the tea tree canopy drip line. The small ditch, immediately after the deep application cover the soil, it is best to finish the summer tea in early June fat.
Prevention and control of pests Summer tea gardens focus on prevention of tea cake disease and tea bud blight. The focus of insect pests is on tea caterpillars and tea worms. Tea cake disease is mainly harmful to new shoots and young leaves. The lesions are recessed on the front of the leaves. The back of the tea cake has bun-like protrusions and produces pale white powdery spores. Control can be used 0.2% ~ 0.5% copper sulfate solution spray, spray once every 7 days, and even spray 2 to 3 times. The leaf blight caused by tea bud blight is distorted and irregularly shaped. It is charred, and the lesion is black or dark brown. It usually occurs on the young leaves of summer tea. 70% thiophanate-methyl 75% to 100 grams can be used per mu and 50 kg of water can be sprayed. Spray once every 7 days. The larvae of tea caterpillars and tea-footworms can eat fresh leaves and shoots when their shoots are severe. They can use all 90% of wettable dipterex to spray per acre.
After tea trees are continuously picked, a large amount of nutrients are consumed in the body. During summer, the soil is hot, the soil is compacted and weeds are piled up, and the soil strength is reduced, causing more pests and affecting normal growth. Therefore, the main purpose of fertilizer application in summer tea gardens is to restore the vitality of tea trees, create a good ecological environment, and achieve high quality and high yields of summer and autumn tea.