What is a chlorophyll meter?
A chlorophyll meter is a handheld device used to measure the chlorophyll content or chlorophyll concentration in the leaves of plants. It is used to assess the health, nutrient status, and photosynthetic activity of plants.
The chlorophyll meter works based on the principle that chlorophyll absorbs light in the red (650-680 nanometers) and near-infrared (880-940 nanometers) regions of the electromagnetic spectrum. The meter emits light at specific wavelengths in these regions and measures the amount of light that is absorbed by the chlorophyll in the plant's leaves. The more chlorophyll present in the leaves, the greater the light absorption, and this is used to calculate a chlorophyll index.
In the absence of nutrient and water limitations the chlorophyll content in plant leaves is a crucial indicator of the plant's photosynthetic capacity and overall health. SPAD can be used to judge nitrogen fertilizer decisions.
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