During the expansion of lettuce, sufficient nitrogen and potassium fertilizers are needed to rapidly inflate. Specific methods are as follows:
In the early, middle and late stages of lettuce elongation, nitrogen and potassium fertilizers are applied at a time, and 15-20 kg of urea, 8-10 kg of potassium sulfate, or 20-25 kg of potassium nitrate are applied per mu, which is against fresh water or biogas slurry. After 150 to 200 times of decomposed human or animal manure water is poured, it is evenly applied to the soil around the root of the lettuce plant. It is better to completely infiltrate into the soil without overflow. In addition, during the elongation and expansion of lettuce, the leaves should be sprayed with 0.3% urea, 600 times amino acid potassium mixture or 0.5% potassium nitrate solution once every 7 to 10 days, and sprayed continuously for 2 to 3 times. Spray all the leaves evenly to start dropping drops of water, supplementing nitrogen and potassium fertilizers from the leaves.
Short range distance sensors from JRT combine highly precise measurement results with quick and reliable response. Short distance sensor module use single-transmit and single-receive measurement technology and can be used to measure a distance or monitor the slow moving objects. For the laser pointer distance measure, also called optical range sensor, can measure legth, width, depth. Laser rangefinder transducer with rxtx has been widely used to industries.
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Chengdu JRT Meter Technology Co., Ltd , https://www.irdistancesensor.com