The soil nutrient analyzer can measure the relative chlorophyll content or "greenness" of plants in real time. The chlorophyll content in plant leaves indicates the condition of the plant itself. The leaves of plants with good growth will contain more chlorophyll, and the chlorophyll content is closely related to the nitrogen content in the leaves. Therefore, chlorophyll measurement values can also indicate the true nitrate demand of plants. With this portable chlorophyll analyzer, it can guide the reasonable application of nitrogen fertilizer, improve nitrogen utilization efficiency, and protect the environment (prevent excessive nitrogen fertilizer from polluting the environment, especially water sources).

Experts suggest that nitrogen has a significant impact on crop growth, development, yield, and quality. When nitrogen is deficient, crop root production is significantly inhibited, and the formation and development of reproductive organs are also limited. Plants mature prematurely, and fruits are small and not full. However, excessive application of nitrogen fertilizer can reduce the efficiency of nitrogen fertilizer utilization. Excess nitrogen fertilizer mostly enters groundwater and surface water, causing the continuous accumulation of nitrate nitrogen in groundwater and surface water, leading to eutrophication of water bodies and a series of environmental problems. Therefore, how to apply nitrogen fertilizer in moderation and minimize its use to reduce costs and environmental pollution without causing yield reduction is an important aspect of precision agriculture technology research.

The soil nutrient analyzer is an instrument that displays the degree of plant greenness by measuring the SPAD value. It determines the SPAD value to guide the application of nitrogen fertilizer and understand the growth status of plants. The chlorophyll analyzer can immediately measure the relative content of chlorophyll in plant leaves and display the measurement number on the instrument's LCD screen.

Due to its fast measurement time, direct display of chlorophyll values on LCD, compact and portable size, and the ability to be carried to the field for measurement, the soil nutrient analyzer is increasingly favored by professionals for measuring samples through various plant leaves.