The physiological characteristics of strawberry are very obvious, mainly because of its shallow root system, which results in successive results. This has a great demand for topdressing in the field. Application of nitrogen fertilizer is one of the most important measures for increasing yield in strawberry production. With the increase of nitrogen fertilizer application in strawberry production, strawberry production increased significantly. However, nitrogen fertilizers continued to be used in large quantities, resulting in a decrease in the yield increase effect of nitrogen fertilizers. The average nitrogen fertilizer utilization rate was only 35%, resulting in a decline in the economic benefits of fertilization. At the same time, it also caused a series of environmental problems such as deterioration of field ecological conditions and groundwater pollution. Therefore, strawberry diagnostic top dressing has a strong practicality and feasibility. SPAD502 chlorophyll meter is very effective in determining chlorophyll content of plants.
Recent studies have shown that it is possible to monitor the nitrogen content of plants by measuring the chlorophyll content and to understand the nitrogen status of crops. Portable chlorophyll meter is widely used in nitrogen diagnosis and nitrogen fertilizer recommendation due to its simple, rapid and non-destructive characteristics. Mainly in rice, wheat, cotton and vegetables and other field crops. The SPAD502 chlorophyll meter was used to determine the SPAD value of strawberry leaves under different nitrogen supply levels. The relationship between the SPAD value and strawberry nitrogen nutrition index provided the theoretical basis for strawberry nitrogen diagnosis and nitrogen fertilizer recommendation.
There was a significant linear correlation between the SPAD values ​​measured by the SPAD502 chlorophyll meter and soil inorganic nitrogen, plant total nitrogen and leaf nitrate content. It was shown that, to a certain extent, SPAD values ​​can reflect the soil inorganic nitrogen, plant total nitrogen and relative nitrate content of the leaves. The chlorophyll meter reading is the external performance of the nitrogen status of the strawberry and can be used as a diagnosis of nitrogen nutrition. index.
The SPAD502 chlorophyll meter readings of strawberry leaves increased with the increase of soil inorganic nitrogen, plant total nitrogen and leaf nitrate content, that is, there was a significant linear correlation between SPAD values ​​and the above indicators. Therefore, the plant's nitrogen nutrition levels can be diagnosed by SPAD values.
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