principle

SPAD-502 Plus evaluates the relative content of chlorophyll in the current leaves by measuring the absorption rate of leaves in two wavelength segments.

The figure below shows the absorption rate of chlorophyll on the spectrum in both leaf samples.It can be seen from the figure that chlorophyll has peaked absorption in the blue region (400-500 nm) and red region (600-700 nm), but it has no absorption in the near-infrared region.

Using this absorption characteristic of chlorophyll, the SPAD-502 Plus measures the absorption rate of leaves in the red and near-infrared regions.A SPAD value is calculated based on the absorption rate of these two parts of the region, which is a parameter corresponding to the chlorophyll content in the leaves using numbers.

Test the nutritional conditions of crops

The chlorin content in the leaves is also related to the current nutritional status of the crop.As can be seen from the figure below, the chlorophyll content (denoted by SPAD values) increases proportionally to the nitrogen content of the leaves.For a particular crop variety, the higher the SPAD index means the healthier the crop.

Nitrogen (N) element control management

Nitrogen (N) elements play a very important role in the growth process of crops.

For growers, knowing the nitrogen demand for crops can control the supply of nitrogen fertilizer in the right amount.

Some experiments have shown that the SPAD series can help reduce nitrogen fertilizer use by 10% while ensuring that crop yields do not decrease.

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

More and more people have begun to realize the pollution caused by excessive use of nitrogen fertilizer to lake water and groundwater and have begun to realize the importance of using nitrogen fertilizer in moderation.

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

Features

Quick and easy measurement

When measuring, you only need to insert the blades and close the measurement probe, without cutting the blades off. This way, you can monitor specific blades throughout the growth process of the crop, thereby obtaining more scientific analysis results.

Trend chart display

The measured sets of data trends will be displayed in the figure, and those data with large differences can be found at a glance, so as to be taken seriously and analyzed.

Waterproof function

The SPAD-502 Plus has waterproof function (IPX-4) and can be used outdoor measurements even on rainy days.

Note: Do not immerse the instrument in water, or clean the instrument directly with water.

Lightweight, easy to carry

The SPAD-502 Plus has a compact body with a weight of only 200 g, making it easy to pocket and take to the site for measurement.

Low battery consumption

The SPAD-502 Plus uses LED lighting sources, which greatly reduces battery consumption. A set of 2 AA batteries can be measured about 20,000 times.

Small measurement area

The SPAD-502 Plus has a measuring area of ​​only 2×3 mm, which can measure small leaves and the sample can be as thick as 1.2 mm.The depth adjustment device is used to set the maximum depth at which the sample can be inserted into the sample slot to keep the measurement point constant.

Measurement parameters

Chlorophyll relative content SPAD value

Application areas

Chlorophyll content is an important indicator of plant health. This instrument can be widely used in botany, agronomy, forestry, horticulture, ecology and other fields.

Main technical parameters