Lettuce twitch how to do
Inquiries: I am a farmer in Ganzhou District, Zhangye City. Lettuce has small leaves, few leaves, fine stems, thin leaves, tender stems, and convulsions. What is the reason? Answer: I. Causes of lettuce twitching. 1. Improper selection of varieties. There are many varieties of lettuce, their adaptability and their sensitivity to sunlight and temperature are also different. Generally, early-maturing varieties are more resistant to low temperature than mid- and late-maturing varieties and have a lower temperature resistance, which means that they are more sensitive to high temperatures and long days. Therefore, suitable varieties should be selected according to the cultivation season and cornices. For lettuces harvested in spring and summer or in autumn, due to their growth under conditions of high temperature and long days, mid- and late-maturing varieties that are resistant to high temperatures and unresponsive to long days of sunshine should be used. If you use early-maturing varieties it is easy to get high convulsions. 2. Poor cultivation and management. Overcultivation is too dense and the density of colonization is too large; too much rainfall, excessive soil moisture; insufficient fertility or partial application of nitrogen fertilizer, but also easily cause plant heightening and long planting. Second, preventive measures. 1. According to the local natural ecological conditions to select the appropriate species, the appropriate sowing date, seedling and transplanting planting period. 2. Rational water and fertilizer management in the field, especially the regular application of chlormequat is an effective measure to control the early bolting of lettuce in the high temperature season. The spraying of chlormequat is generally started at the beginning of the rosette period, once every 7 to 10 days, for 2 to 3 consecutive times, and the application concentration is 350 mg/L. 3. Harvest in time. The harvest of lettuce is suitable for the period when the heart leaves and outer leaves are “flat mouthâ€, and if they are not harvested in time, the tender stems will quickly lick high twitches. If you delay the harvest, you can pick up the growth point or bud at the top of the lettuce during the “flat mouth†period. After the top of the plant can inhibit the growth of the top, increase the backflow of nutrients in stems, prevent hollow stems, promote stems hypertrophy, generally can be postponed for 5 to 7 days.
What is Battery Mini Camera
Micro camera is a product of modern high-tech, also known as micro monitor. It has the characteristics of small size, powerful function and good concealment.
Some cameras also use video transmission lines for synchronous power supply without external power lines.
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Wireless
Wireless equipment is used stably in domestic wireless environment. The micro wireless surveillance camera has the characteristics of high stability, high speed, long distance and multi-point testing. It can play a huge role in the fields of environment, energy, construction, transportation, medical treatment, industrial machine condition monitoring, etc., especially when the cabling is complex, the cabling cost is high, the long-distance and large-scale transmission of data and the mobility demand is high.
The main structures and components of the camera can be listed from the working principle of the camera:
1. LENS
Lens structure, consisting of several lenses, including plastic lens or glass lens
2. Image sensor
It can be divided into two categories:
CCD (charge couple device): charge coupled device
CMOS (complementary metal oxide semiconductor): complementary metal oxide semiconductor
3. Digital signal processing chip (DSP)
There are many DSP manufacturers, such as VIMICRO 301P/L, SONIX 102/120/128, ST (Logitech LOGITECH's DSP provider), SUNPLUS (SUN+focuses on the development of CIF and VGA for single chip, but the image quality is average), PIXART (original phase), PAC207, SQ930C, etc.
4. Power supply
Two working voltages are required inside the camera: 3.3V and 2.5V. The latest process chip can use 1.8V.