Changes in Leaf Area and Chlorophyll of Rice The main factors affecting the synthesis of organic matter in rice during photosynthesis of rice include leaf area (LAI), chlorophyll content (CH.D), sunlight, and carbon dioxide concentration. During the photosynthetic reaction, leaves Excessive area does not necessarily contribute to the synthesis of organic matter in plants, but the leaf area and chlorophyll content of rice have a certain degree of regularity. The leaf area of ​​rice is measured by using a portable leaf area meter, followed by the use of chlorophyll. To calculate the chlorophyll content, the following figure shows:
Figure 1 Figure 2
Figure 1 shows the LAI curve of the early-seeded rice, LAI showed a parabolic curve, and the LAI curve of the late-seeded rice was similar. From the transplanting to the ear-starting stage, as the number of rice tillers increased, the area of ​​single leaf continued to increase, prompting LAI to increase continuously. The rate of increase of LAI from fast to slow to the late stage of heading, ineffective childbirth, while the area of ​​single leaf still increased, LAI reached the maximum value. After the grain-filling period, because the leaves are no longer able to perform strong photosynthesis, the leaves constantly transfer nutrients to the panicles, the leaves gradually age, and the leaves in the lower part of the plants gradually dry up and dry up, and the LAI rapidly decreases. Chlorophyll is the substrate for dry matter production in crops. The green body and chlorophyll content per unit area will affect the economic output. Usually, the product of the leaf chlorophyll content and the fresh weight of the total green leaf area per unit area is defined as the chlorophyll density (CH.D). Figure 2 shows that the CH.D of the population before and after anthesis is the highest, although the chlorophyll content of the leaf is continuously stable until the late growth stage. However, the decline in leaf area index at the end of flowering resulted in a decrease in chlorophyll content per unit area of ​​land, that is, a decrease in CH.D, and a similar pattern of variation in late-seeding rice CH.D. From the seasonal change trend, the CH.D and the leaf area index of the population are similar, because the CH.D of the population contains the information of the LAI and the chlorophyll content of the single leaf, which is a comprehensive manifestation of the two.
The above summary of leaf area and changes in chlorophyll content during rice growth also allows us to understand the main timeframes for rice organic matter synthesis.
Figure 1 Figure 2
Figure 1 shows the LAI curve of the early-seeded rice, LAI showed a parabolic curve, and the LAI curve of the late-seeded rice was similar. From the transplanting to the ear-starting stage, as the number of rice tillers increased, the area of ​​single leaf continued to increase, prompting LAI to increase continuously. The rate of increase of LAI from fast to slow to the late stage of heading, ineffective childbirth, while the area of ​​single leaf still increased, LAI reached the maximum value. After the grain-filling period, because the leaves are no longer able to perform strong photosynthesis, the leaves constantly transfer nutrients to the panicles, the leaves gradually age, and the leaves in the lower part of the plants gradually dry up and dry up, and the LAI rapidly decreases. Chlorophyll is the substrate for dry matter production in crops. The green body and chlorophyll content per unit area will affect the economic output. Usually, the product of the leaf chlorophyll content and the fresh weight of the total green leaf area per unit area is defined as the chlorophyll density (CH.D). Figure 2 shows that the CH.D of the population before and after anthesis is the highest, although the chlorophyll content of the leaf is continuously stable until the late growth stage. However, the decline in leaf area index at the end of flowering resulted in a decrease in chlorophyll content per unit area of ​​land, that is, a decrease in CH.D, and a similar pattern of variation in late-seeding rice CH.D. From the seasonal change trend, the CH.D and the leaf area index of the population are similar, because the CH.D of the population contains the information of the LAI and the chlorophyll content of the single leaf, which is a comprehensive manifestation of the two.
The above summary of leaf area and changes in chlorophyll content during rice growth also allows us to understand the main timeframes for rice organic matter synthesis.
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