After the watermelon is planted, it is necessary to close the greenhouse after the planting of the watermelon to reach the vine. Generally, the greenhouse is not released, and the small film is roasted on the sunny day to warm the temperature. The temperature is maintained at 30°C during the day and the temperature is not lower than 7°C during the night. Application of urea 5 kg, potassium dihydrogen phosphate 3 kg. This period attention to cold and frost, can be used in the greenhouse two corn stalks outside the barrier. Extension of vines to the temperature management as the center, the greenhouse temperature during the day 30-32 °C, no less than 12 °C at night, no drought, no watering to facilitate seedlings hair roots and lateral vine growth. During the expansion period, the temperature is increased by 32-35°C during the day and 13-14°C during the night. Generally, 4 vines per plant are left, pollination is conducted in mid-March, and only the 2nd and 3rd melons are given. When the melon grows to the size of the egg, it starts to top up with water, 6 kg of urea is applied to urea, 3 kg of potassium dihydrogen phosphate is added, and melon grows. When it is more than 10 kilograms, it enters the peak of growth, and it is poured into water every 3-5 days, and 10 kg of urea and 8 kg of potassium dihydrogen phosphate are applied. Wait for maturity to pick up the market in a timely manner.
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.accuracysensor.com