How light time affects plant growth

How light time affects plant growth

Illumination time varies with the seasons. In the northern hemisphere and in summer, the light duration is the longest. After September, the sun rotates towards the southern hemisphere and its daylight hours are shortened. Therefore, the illumination time is very large. The regularity, at the same time, also has uncontrollability. The effect of light time on plants is mainly due to its effect on the photosynthesis of plants. Photosynthesis is one of the plant's most important physiological activities. It is a process in which plants accumulate organic matter and provide growth. Therefore, photosynthesis is strong and weak. It is directly related to the growth of the crop.

Different plants have different lighting time requirements. For example, some plants are required to be shorter in the day and night in the longer seasons, such as early spring primroses and autumn blooming chrysanthemums; some plants are required to bloom in the shorter days of the day, such as the summer-flowering irises. The effect of this alternate length of day and night on plant flowering and fruiting is called the photoperiod phenomenon of plants. This is determined by the nature of the plant, but with the development of science and technology, people have developed an instrument-light incubator that can control the light time and light intensity. The light incubator is an instrument that can independently provide light-related parameters. Human control is very beneficial to the growth of plants. In addition, plants grow in the natural environment, there are other environmental factors, such as temperature and humidity, wind speed, dew point and other parameters, at this time, a hand-held weather station is an essential instrument. There are many different types of this instrument, which can measure up to 12 parameters. The practice has proved that this instrument has great practicality, and it also provides a lot of help for the modernization of agriculture.

According to the different photoperiodic responses of plants, plants can be divided into long-day plants, short-day plants and intermediate plants. Long daylight plants: It takes a period of time for the plant to grow and develop. Flowering buds can be formed when the daily light hours exceed a certain limit (14 to 17 hours). The longer the light time, the earlier the flowering. Most of the plants growing in areas with latitudes over 60° are long daylight plants. Short-day plants: In the process of plant growth and development, there is a need to have a short time during the day (less than 12 hours, but no less than 8 hours, with the light control box is the fastest), long night conditions. Within a certain range, the longer the dark period, the shorter the flowering. Many of the plants that bloom in tropical, subtropical and temperate spring and autumn seasons fall into this category. Intermediate plants: There are no strict requirements on the length of light during the growth and development of plants. As long as other ecological conditions are suitable, they can bloom under different lengths of sunshine. Such as tomatoes, cucumbers, green beans and so on.