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There is a clear correlation between the average chlorophyll spad value measured by growth chlorophyll analyzer and the crop yield. Preliminary analysis shows that under different levels of farmland nitrogen supply, the chlorophyll and leaf area index measurements at a previous stage of fertility can be used to guide the later stage. Farmland water management and production forecasting. The physiologic 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 crop leaves at three different development times is not very obvious, and the difference in the water use efficiency of the crop is large. According to crop physiological requirements, the nitrogen content of leaf affects the water physiological utilization efficiency by affecting the carbon dioxide assimilation rate of crops and the effective utilization rate of radiation 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 roots, stems and leaves flows to the fruit organ to make up for the deficiency of nitrogen uptake. The impact. Therefore, the yield can be predicted based on the nitrogen content of leaf during physiological development.
The growth of crops and the absorption of soil nitrogen are closely related to soil moisture and nitrogen status. It is the final result of the coupling of water and fertilizers under certain conditions, and leaf nitrogen is one of the most active factors that reflect the nitrogen uptake of crops. . The chlorophyll meter provides a convenient method for determining leaf chlorophyll in the field. It deeply studies the relationship between chlorophyll status and crop water physiological efficiency, and discusses the possibility of chlorophyll observation and chlorophyll tracking to guide the management of water and fertilizer in the field. Practical significance.
The growth of crops is the result of comprehensive effects of soil moisture and nitrogen status, and the nitrogen content of leaves is closely related to photosynthesis. The spad value reflecting the leaf chlorophyll content (nitrogen content) is to a certain extent soil moisture, A comprehensive reflection of nitrogen use efficiency shows that the comparison of the observation process of chlorophyll meter under different conditions of moisture and nitrogen shows that under a certain soil moisture condition, there is a most reasonable demand for nitrogen fertilizer supply, and the increase in the amount of fertilizer does not increase. The physiological efficiency of the crop.