First, to do a good job of grafting, grafting is an effective way to prevent and treat some stubborn diseases. In the selection of watermelon planting and grafting rootstocks, strong affinity species should be selected. In addition, when grafting, attention should be paid to the control of humidity in the booth, frequent ventilation, and the temperature should be well controlled. When the temperature is low, stoves should be used for warming or other methods. When grafting, the grafted personnel should pay attention to personal hygiene so as not to cause infection or even healing of grafted seedlings, thereby affecting the survival rate of watermelon seedlings. Rootstock selection generally choose solid, green straw squash rootstock, watermelon seed to choose the matching stock with the rootstock, with these to ensure that grafted seedlings are good and strong.
Second, prevent watermelon seedling damping-off disease. This disease occurs during the seedling stage, especially before the three-leaf stage. The disease is severe when the temperature is low and the soil moisture is high. At the early stage of disease, yellow spotted seedlings were found near the seedlings, and then became yellow-brown and dry. The disease developed rapidly. The cotyledons did not wither and the seedlings immediately collapsed. When the humidity was high, the diseased part and its surrounding soil could be A layer of white flocculent mycelia is present, which is a fungus that can survive in the soil and is susceptible to disease at 1016°C. Control methods: Use 50% carbendazim to mix soil or make seedbed soil.
Third, to control the watermelon blight: This disease occurs more in the seedling stage, born dark green water immersed circular irregular lesions, and quickly expanded. When the humidity is high, it rots, and then it is light brown. It is easily broken. The seedling stems and leaves, and the base of the seedlings are flooded with water. A dark green depression spot appears, enveloping the stem and rot, and the stems are all dead below. The hospital is a fungus. Disease-resistant varieties should be selected, seeds should be disinfected prior to planting, and disinfected with anti-drug technetium or diethylphosphorus aluminum.
Fourth, prevent watermelon root disease: The disease is also easy to occur in the seedling stage, seedling growth is slow, leaf shrinkage, wilting, the root initially yellow rust, and no new roots, sticky rot, to the upper part of the seedlings wilting death . The disease is mainly caused by excessive soil moisture and low soil temperature. Under conditions of low temperature and high humidity in the soil, the development of roots is hindered, and the regenerative ability, absorption function, and respiration of the roots are severely suppressed, and a large number of root hairs are dying, causing the ground parts to wilt. When growing nursery, try to use nursery bowls or nursery to raise seedlings. The main humidity is not large.
1000Hz High Frequency LiDAR System
JRT High Frequency Range LiDAR Sensor is 2021 new product, that's a low-cost tof sensor but High frequency (up to 1000Hz). With 5cm high accuracy, the LiDAR Module can measure 80m.
Why the 1000Hz High Frequency LiDAR System:
* Widely used in many industrial automation system, like, UAV, delivery van, anti-lock break system, construction automation,intelligent toy robots etc.
* Small size: 43*35*21mm, can be easily integrated
* Invisible laser design: the laser type is 905nm,Class I
* High Frequency: 1000hz/1khz
* Low power design
Chengdu JRT Main Ranging Modules: Industrial Laser Distance Sensor, Laser Distance Meter Module, Tof LiDAR Sensor.
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Chengdu JRT Meter Technology Co., Ltd , https://www.infrareddistancesensor.com