Light is an important environmental factor that affects plant morphology and physiological function. Insufficient light can cause disturbances in nutrient supply in the plant and may lead to leaf yellowing or early death. Excess light energy may cause the photochemical efficiency of the plant to decrease and photoinhibition of photosynthesis occurs. The adaptation of plants to light intensity also varies depending on the differences in plant ecological habits. The results showed that the photosynthetic rate of Hibiscus species was higher under strong sunlight, and the growth was more robust and the root system was more developed. However, shade-tolerant tree species had higher chlorophyll content under moderate sunspot, faster plant growth, larger leaves, and higher photosynthetic rate.
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The growth of seedlings is the result of the combined effects of the natural environmental conditions outside the plant. Studies have shown that different light intensities have a greater impact on the growth of seedlings. Under the condition of consistent water and fertilizer conditions, the annual growth of full irradiance conditions is 1.69 times of annual growth under 40% light conditions and 2.47 times of annual growth under 15% light conditions. In terms of ground diameter growth, the annual growth of tartary buckwheat under full light conditions is 1.62 times the annual growth under 40% light and 2.92 times the annual growth under 15% light. Analysis of variance showed that seedling height and ground diameter growth of seedlings under 40% and 15% light intensity were significantly different from those under full light (P<0.05). This shows that low light will affect the growth of seedlings, resulting in low seedlings and reduced quality.
It can be seen that the light conditions have a great influence on the growth of seedlings. For different climatic conditions for the growth of seedlings, we need to use relevant instruments for monitoring, such as small weather stations. The small weather station is connected with different sensors to measure environmental factors and can measure up to 12 parameters at the same time. It is also called a small-scale automatic weather station and is often used in agricultural weather. In addition, if the relative soil moisture alone is measured, we often use the agricultural environmental monitoring station for monitoring. 
Effects of Light on the Growth of Seedlings