Vegetable farmers often say that tomatoes have hollow fruits, also called hollow fruits, which are mainly manifested as not full flesh, fruit with ribs on the outside, light weight, and poor quality, which is a type of deformed fruit. The production of hollow fruits is closely related to the weather and improper cultivation management. The management measures are as follows: Strengthen the temperature management. From the planting of the tomato to the first inflorescence, it is necessary to manage the temperature to ensure the normal flower bud differentiation. It is recommended that vegetable farmers control the temperature at 23-28 ° C during the day and the temperature at 13-16 ° C at night. Pay attention to root system maintenance. Tomato root system is weak in winter. Watering should be selected in the morning as much as possible in the winter. The ground temperature should be maintained at about 15 ℃ and the temperature difference between the water temperature and the ground temperature should be as small as possible. Water to about 15 degrees Celsius. Combined with watering, functional fertilizers such as chitin, alginic acid, and microbial inoculants should be applied. Root maintenance is a systematic "engineering" and needs to run through the tomato growing season. After a reasonable supply of fertilizer and tomato enters the flowering and fruiting stage, the amount of nitrogen fertilizer should be appropriately controlled and the amount of potassium fertilizer should be increased. At the same time, the fertilizer should be used according to the growth of the plant, and the balanced fertilizer and high potassium fertilizer should be used alternately. Don't be greedy for the retained fruit. Remove the stagnant but stunted fruit in time to promote normal fruit expansion. And pay attention to reasonable leaf picking, especially in the later stage, it is advisable to keep 1 or 2 under the ears to avoid excessive leaf picking and exacerbate the occurrence of hollow fruits. Disclaimer: Some articles on this website are transferred from the Internet. If third party legal rights are involved, please inform this website to deal with them. phone Industrial Laser Distance Sensor
Industrial
Laser Distance Sensor, we also call it secondary development laser distance
module, which support TTL level and CMOS. The laser range sensor can be widely
used in professional surveying, mapping, construction, robots, hunting arrows,
industrial monitoring and automated measurement applications in electricity,
transportation, etc. Our laser distance module supports data communication with
RS232, USB with a simple adapter. The results of laser distance sensor can be
evaluated with Arduino. We are always looking ahead, hoping we can make every
measurement simple in life!
Parameters
of M703A:
Accuracy
±1
mm (0.04 inch)
Measuring
Unit
mm
Measuring
Range (without Reflection)
0.03-60m(150m can customize)
Measuring
Time
0.125~3
seconds
Laser
Class
Class
II
Laser
Type
620-690nm,
<1mW
Size
45*25*12mm (±1 mm)
Weight
About 10g
Voltage
DC2.0~3.3V
Electrical
Level
TTL/CMOS
Frequency
8Hz(20Hz can customize)
Operating
Temperature
0-40 ℃ (32-104 ℉ )
Storage
Temperature
-25~60 ℃ (-13~140 ℉)
Laser Distance RS232,Arduino Distance Module,Laser Module RS232 Chengdu JRT Meter Technology Co., Ltd , http://www.rangesensors.com
What can I do if tomatoes grow in the greenhouse?>
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