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The necessity of plant light supplement

2021-08-05

Light is closely related to the growth of crops. It is directly related to the benefit of agricultural production to capture light energy to the maximum extent and give full play to the potential of plant photosynthesis. In recent years, due to the promotion of market demand, greenhouses are widely used to produce anti season flowers, fruits, vegetables, etc. due to the short sunshine time in winter and spring, the slow growth of crops and low yield, it is urgent to supplement light. Most of northern China is located in the east of Asia, which belongs to the temperate monsoon climate. In winter and spring, influenced by the cold air of Siberia, sometimes rain and snow are formed due to the convergence of cold and warm air. There were 1-3 days of low temperature and 7-8 days of continuous overcast. According to the statistics of data in Beijing in the past 50 years, the probability of this kind of weather with long-term continuous overcast and low illumination is about 20%, 40% in the past 10 years, twice in the past 3 years, more than 60%. That is to say, the winter and spring disasters in Beijing are becoming more and more serious, which has become a major disastrous weather for the production of winter and spring protected areas. The direct threat to the production of protected areas represented by solar greenhouses is as follows:
 
 
(1) when the light intensity is lower than the compensation point, the consumption of organic matter is more than the accumulation, and the dry quality of the plant declines, even dies. Even under the condition of weak light, the growth of plants is weak and appears the phenomenon of excessive growth. According to the intensity requirements of medium-sized vegetables such as peas, beans, celery, radish, onion and so on. The light intensity of lettuce, spinach, chrysanthemum, ginger and other vegetables with weak light intensity is lower. Even in sunny days, the light intensity of Solanaceous fruit vegetables can not reach the light saturation point due to the reduction of plastic curtain, but it can reach the light compensation point or above (which is also the reason why the taste of Solanaceous fruit vegetables is light). If it is cloudy and cloudy, the light is insufficient, the light intensity is not enough, the light time is short, and the compensation point cannot be reached. As a result, there is a sharp decline in photosynthetic efficiency, a rapid decrease in dry matter accumulation, and a rapid increase in disease.
 
 
 
(3) according to the summary of research and production practice, we generally divide the disaster into three levels. 1. Light grade: no sunshine for 3 days in a row; or no sunshine for 3 days in 4 days in a row. At this time, cucumber, tomato, pepper and other diseases and downy mildew begin to appear. 2. Intermediate level: there is no sunshine for 4-7 days in a row; or the hours of sunshine are less than 3 hours for more than 7 days in a row; or there are two times of light grade and few sunshine in a month. At this time, cucumber, tomato, pepper and other diseases generally occur, but they can be controlled through chemical control and other measures. 3. Heavy grade continuous overcast days ≥ 8 days; or sunshine hours < 3 hours for more than 10 consecutive days; or 2 times of intermediate low light in January, at this time, 10% - 20% of the diseases are difficult to control, most of them have reduced production, and continue to develop.

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The necessity of plant light supplement

Light is closely related to the growth of crops. It is directly related to the benefit of agricultural production to capture light energy to the maximum extent and give full play to the potential of plant photosynthesis. In recent years, due to the promotion of market demand, greenhouses are widely used to produce anti season flowers, fruits, vegetables, etc. due to the short sunshine time in winter and spring, the slow growth of crops and low yield, it is urgent to supplement light. Most of northern China is located in the east of Asia, which belongs to the temperate monsoon climate. In winter and spring, influenced by the cold air of Siberia, sometimes rain and snow are formed due to the convergence of cold and warm air. There were 1-3 days of low temperature and 7-8 days of continuous overcast. According to the statistics of data in Beijing in the past 50 years, the probability of this kind of weather with long-term continuous overcast and low illumination is about 20%, 40% in the past 10 years, twice in the past 3 years, more than 60%. That is to say, the winter and spring disasters in Beijing are becoming more and more serious, which has become a major disastrous weather for the production of winter and spring protected areas. The direct threat to the production of protected areas represented by solar greenhouses is as follows:
 
 
(1) when the light intensity is lower than the compensation point, the consumption of organic matter is more than the accumulation, and the dry quality of the plant declines, even dies. Even under the condition of weak light, the growth of plants is weak and appears the phenomenon of excessive growth. According to the intensity requirements of medium-sized vegetables such as peas, beans, celery, radish, onion and so on. The light intensity of lettuce, spinach, chrysanthemum, ginger and other vegetables with weak light intensity is lower. Even in sunny days, the light intensity of Solanaceous fruit vegetables can not reach the light saturation point due to the reduction of plastic curtain, but it can reach the light compensation point or above (which is also the reason why the taste of Solanaceous fruit vegetables is light). If it is cloudy and cloudy, the light is insufficient, the light intensity is not enough, the light time is short, and the compensation point cannot be reached. As a result, there is a sharp decline in photosynthetic efficiency, a rapid decrease in dry matter accumulation, and a rapid increase in disease.
 
 
 
(3) according to the summary of research and production practice, we generally divide the disaster into three levels. 1. Light grade: no sunshine for 3 days in a row; or no sunshine for 3 days in 4 days in a row. At this time, cucumber, tomato, pepper and other diseases and downy mildew begin to appear. 2. Intermediate level: there is no sunshine for 4-7 days in a row; or the hours of sunshine are less than 3 hours for more than 7 days in a row; or there are two times of light grade and few sunshine in a month. At this time, cucumber, tomato, pepper and other diseases generally occur, but they can be controlled through chemical control and other measures. 3. Heavy grade continuous overcast days ≥ 8 days; or sunshine hours < 3 hours for more than 10 consecutive days; or 2 times of intermediate low light in January, at this time, 10% - 20% of the diseases are difficult to control, most of them have reduced production, and continue to develop.

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