SPAD-502 Chlorophyll Meter

SPAD-502 Plus is an instrument that can help users understand the nutritional status of crops by measuring the chlorophyll content in the leaves of the crops. The content of chlorophyll is related to the growth conditions of crops, so it can be used to judge whether the corresponding fertilizer needs to be added.

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SPAD-502 PLUS chlorophyll meter


SPAD-502 Plus chlorophyll meter is an instrument that can help users understand the nutritional status of crops by measuring the chlorophyll content in the leaves of the crops. The content of chlorophyll is related to the growth conditions of crops, so it can be used to judge whether the corresponding fertilizer needs to be added. Only by optimizing nutritional conditions can healthy crops be grown and a high-quality harvest can be obtained.

Test principle:

It evaluates the relative content of chlorophyll in the current leaves by measuring the absorption rate of the leaves in the two wavelength bands. The figure below shows the absorption rate of chlorophyll in the two leaf samples.

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It can be seen from the figure that chlorophyll absorption peaks in the blue region (400-500nm) and red region (600-700nm), but it does not absorb in the near infrared region.

Using this absorption characteristic of chlorophyll, SPAD-502Plus measures the absorption rate of leaves in the red and near infrared regions. Through the absorption rate of these two areas, a SPAD value is calculated, which uses numbers to represent the current parameters corresponding to the chlorophyll content in the leaves.

Testing the nutritional conditions of crops

The chlorophyll content in the leaves is related to the current nutritional status of the crop. As you can see from the figure below, the chlorophyll content (expressed by SPAD values) increases in proportion to the nitrogen content in the leaves (an important nutrient). For a specific crop variety, the higher the SAPD index, the healthier the crop.

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Characteristics of SPAD502 chlorophyll meter:

Trend graph display: The measured trends of multiple sets of data will be displayed in the graph, and those data with large differences can be found at a glance, so that they are valued and analyzed.

Lightweight and easy to carry: SPAD-502Plus has a compact body with a weight of only 200g, which can be conveniently put into a pocket and brought to the scene for measurement.

Quick and easy measurement: only need to insert the leaf and close the measuring probe during the measurement, without cutting the leaf, so that the specific leaf can be monitored throughout the growth process of the crop, so as to obtain more scientific analysis results .

Waterproof function: SPAD-502Plus has a waterproof function (IPX-4), even in rainy days, it can be measured outdoors.

* Do not immerse the instrument in water or wash the instrument directly with water.

Low battery consumption: SPAD-502Plus uses LED lighting, so it can greatly reduce battery consumption. A set of 2 AA batteries can be measured about 20,000 times.

Small measuring area: the actual measuring area is only 2 x 3mm, even small blades can be measured. In addition, the depth adjustment device can accurately measure even small blades.

High precision: High precision (± 1.0 SPAD) measurement, even crops with similar growing environment can be measured and analyzed and classified.

Data storage: SPAD-502Plus chlorophyll meter can store up to 30 sets of measurement data in the memory, and can delete or restore the latest measurement data. In addition, the instrument can automatically calculate the average value of all data for reference.

Reading test: The reading test allows the customer to check whether the SPAD-502Plus is in normal operation to ensure accurate measurement data.

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