The leaf area detector is an instrument for measuring the area of ​​the leaf. The area of ​​the leaf is related to the photosynthesis of the plant, it is related to the growth of the crop and even the yield of the crop. Therefore, in agriculture, it is often required to determine the leaf area of ​​the leaf. In addition, a very important concept is the leaf area index, which is also calculated by determining the size of the leaf area. The leaf area index reflects a better dynamic indicator of the size of the crop population. Within a certain range, the crop yield increases with the leaf area index. From this we can see that the determination of the leaf area is very necessary. It is these requirements that allow the leaf area detector to show its talents and become one of the essential instruments for plant physiological testing. This article mainly analyzes from rice, leaf area detector how to help determine the maximum period of rice leaf area index.
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By using the leaf area detector to track the leaf area index at different stages of rice, the maximum period for understanding the leaf area index of rice was performed at a time. It was found that when the heading of rice was at the heading stage, if the leaf area index was 7.1, the flat leaf was under the top of the canopy. Ninety-seven percent of solar leaves are captured at 30 cm, while only 50% of upright leaves. Therefore, theoretically speaking, the net photosynthesis of standing leaf rice population is larger than that of the horizontal leaf population. However, when the leaf area index was relatively small, horizontal leaf rice populations showed higher photosynthesis. In addition, when exposed to direct sunlight, only one side of the leaves of the rice population receives strong light; when sunlight is scattered, the lower leaves of the group receive more light than direct light. When the leaf area index of the population is greater than 3, the reflected radiation is about 20% of the solar radiation. The solar radiation absorbed by the population is the highest in the booting stage and gradually decreases after the panicle start. Most of the energy is consumed by conduction and transpiration. The net photosynthetic intensity of rice does not exceed 5% to 6% of the total energy absorbed, of which the net energy conversion rate at booting stage is about 5% and the highest at heading stage is 7%, then it rapidly declines. Rice is a short-day crop, and different types of species respond differently to the length of light. In Guangzhou, 41 species were used to control the length of light. It can be seen that early rice and mid-season rice have no critical spike length, and they can produce normal spikes under short-day or long-day conditions, which is a type of short-day insensitivity. Late-day rice varieties generally promote short-day emergence of spikes and long-day delay of emergence. There is a strict threshold light length, which is a short-day sensitive type.