Chlorophyll in plant leaves plays an important role in photosynthesis, and its content is an important indicator for evaluating plant physiological status. By measuring the concentration of chlorophyll, it is possible to accurately determine the growth of plants. To measure chlorophyll using traditional spectrophotometry, the sample is extracted with acetone and the sample is measured using a spectrophotometer. Although the traditional spectroscopic method has high measurement accuracy, this method of damage damages plant leaves, takes a long time, is not convenient for continuous measurement, and cannot meet the requirements of rapid and non-destructive testing in the field. Therefore, in view of the current lack of high-precision, low-cost field chlorophyll rapid detection equipment for field crops in China, a portable chlorophyll detection device based on single-chip microcomputer is researched and developed. The chlorophyll meter was developed in such a state.
The chlorophyll meter in the growth period has a significant correlation with the average chlorophyll spad value and crop yield. Preliminary analysis shows that under different farmland nitrogen supply levels, the chlorophyll and leaf area index measurements at a certain stage of growth can be used to guide the later stage. Farmland water management and production forecasting. The physiological efficiency of crop water has a tendency to increase with the chlorophyll content, and the two are basically linear.
At the same time, the measured value of the chlorophyll meter can also be seen that the difference between the chlorophyll content (nitrogen content) of the leaves of the three different developmental times is not very obvious, and the difference in the water use efficiency of the crop is large. The physiological requirements of crops are determined. The nitrogen content of leaves affects the efficiency of water physiological utilization by affecting the carbon dioxide assimilation rate of crops and the effective utilization rate of radiant energy.
The increase of leaf chlorophyll (nitrogen content) has a significant effect on the improvement of water use efficiency. In the physiological growth stage, the crop mainly absorbs nitrogen from the outside. After the fruit is developed, the crop absorbs nitrogen from the outside. On the other hand, the nitrogen in the roots, stems and leaves flows to the fruit organs to compensate for the deficiency of nitrogen uptake. The impact. Therefore, the yield can be predicted based on the nitrogen content of the leaves during physiological development.
Crop growth and soil nitrogen uptake are closely related to soil moisture and nitrogen status, which is the final result of water and fertilizer coupling under certain conditions, and leaf nitrogen is one of the most active factors reflecting crop nitrogen uptake. . The chlorophyll analyzer provides a convenient means for determining leaf chlorophyll in the field, and conducts research on the relationship between chlorophyll status and crop water physiological efficiency. It is important to explore the possibility of chlorophyll tracking and observation of chlorophyll in guiding field water and fertilizer management significance
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