SPAD 502 PLUS Portable chlorophyll meter (SPAD Meter)

Instrument Model: 

Nitrogen (N) Element Control Management

Nitrogen (N) plays a very important role in the growth of crops.

For growers, knowing the crop's nitrogen needs can control the supply of nitrogen fertilizer in the right amount.

Some experiments have shown that the SPAD series can help reduce the amount of nitrogen fertilizer by 10% on the premise of ensuring that the crop yield does not decrease.

Controlling the amount of nitrogen fertilizer to the best in the farmland can reduce the crop disease and environmental pollution that may be caused by excessive use of nitrogen fertilizer.

More and more people have begun to realize the pollution of lake water and groundwater caused by excessive use of nitrogen fertilizers and began to realize the importance of using nitrogen fertilizers appropriately.

In the present and future of the continuous development of nitrogen fertilizer application technology, SPAD series products are playing an increasingly important role.

Chlorophyll Meter Specifications

Spad Index: A display index specific to the KONICA MINOLTA chlorophyll meter. Specifications relating to chlorophyll concentration are subject to change without notice.

Chlorophyll meter principle

The SPAD-502Plus measures the relative amount of chlorophyll in the current leaf by measuring the absorption of leaves in two wavelength bands. The figure below shows the absorbance of the spectrum of chlorophyll in the two leaf samples.

It can be seen from the figure that chlorophyll has a peak absorption in the blue (400-500 nm) and red (600-700 nm) regions, but no absorption in the near-infrared region.

Using this absorption characteristic of chlorophyll, the SPAD-502Plus measures the absorption of leaves in the red and near-infrared regions. A SPAD value is calculated from the absorptivity of these two regions, which is a numerical representation of the 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 can be seen from the figure below, the chlorophyll content (indicated by the SPAD value) increases in proportion to the nitrogen content in the leaves (an important nutrient component). For a particular crop variety, the higher the SAPD index, the healthier this crop represents.

Chlorophyll meter characteristics

The trend graph shows that the measured data trends will be shown in the figure, and those data with large differences can be discovered at a glance, and they are valued and analyzed.

Lightweight, easy to carry: The SPAD-502Plus has a compact body, only 200g weight, can be easily pocketed and brought to the scene for measurement.

The measurement is quick and easy: when measuring, it is only necessary to insert the blade and close the measuring probe, without cutting the blade, so that the specific blade can be monitored throughout the growth process of the crop, so that more scientific analysis results can be obtained. .

Waterproof function: SPAD-502Plus has a waterproof function (IPX-4), and it can be measured outdoors even when it is raining.

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

Low battery consumption: It uses an LED lighting source, which greatly reduces the battery consumption. A set of 2 AA batteries can measure about 20,000 times.

Small measuring area: The actual measuring area is only 2 x 3mm, and even small blades can be measured. In addition, the depth adjustment device allows precise positioning of very small blades for measurement.

High-accuracy: High-precision (± 1.0 SPAD) measurement enables crops of similar growth conditions to be measured and analyzed.

Data Storage: Can store up to 30 sets of measurement data in memory, and can delete or restore the most recent measurement data. In addition, the instrument can automatically calculate the average value of all data for reference.

Reading Test: Reading test allows customers to check if it is working properly to ensure that accurate measurement data is always available.