The growth of crops is the result of the combined effects of soil moisture and nitrogen status, and the nitrogen content of leaves is closely related to photosynthesis. The spad value reflecting the chlorophyll content (nitrogen content) of leaves is to some extent soil moisture. A comprehensive reflection of nitrogen use efficiency, the comparison of the observation process of chlorophyll analyzer under different water and nitrogen conditions shows that there is a most reasonable supply of nitrogen fertilizer under certain soil moisture conditions, and the increase of fertilizer application can not improve the physiological efficiency of the crop.
The growth chlorophyll analyzer 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. 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 very convenient means for determining leaf chlorophyll in the field. The research on the relationship between chlorophyll status and crop water physiological efficiency is carried out in depth, and it is of great practical significance to guide the tracking and observation of chlorophyll by chlorophyll analyzer to guide field water and fertilizer management.
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