Monitoring Potassium Levels in Hydroponic Spinach Using Electrical Impedance Spectrum

Potassium is an essential element for plant growth. Most potassium concentration monitoring methods are based on measurements of optical properties of leaves or stems. However, sensitivity to environmental interference makes this method less convenient. In this work, we will evaluate potassium concentration levels based on electrical impedance measurement, using a low-cost measurement prototype.

One of the most important nutrients for plant growth is potassium. During the growth and development of plants, a potassium deficiency generally arises, generating a decrease in the quality and yield of the crop [1]. On the contrary, an excess of potassium in fertilizers causes environmental pollution and increases the cost of production. Therefore, accurate monitoring and diagnosis of nutrients, especially potassium, during crop growth is important.
We will use the electrical impedance spectrum measurement method to assess the nutritional levels of potassium in spinach leaves. Spinach is a plant that has been previously studied by the research group in order to measure its water stress.

Advantages:
- The use of own equipment already tested by the research group.
- The impedance measurement is non-invasive and does not harm the plant.
-Measurements are less sensitive to environmental variations.