The soil nutrient rapid tester is one of the earliest devices developed based on colorimetric analysis using a color box. It was first introduced in the 1970s by Henan Agricultural University. The L&Vngte Speed Tester uses a powder reagent instead of liquid, significantly extending its shelf life. This type of qualitative analysis is commonly used in flower cultivation, fruit trees, gardens, and greenhouses.
However, the sensitive electrode in traditional soil nutrient testers is highly unstable. Improper storage can easily lead to performance degradation. In contrast, the FET-based sensor used in the rapid soil nutrient speedometer offers stable performance and a longer shelf life. Although this technology is still under development, it shows great potential for future applications.
The most accurate method for determining soil nutrients remains chemical analysis using a photoelectric colorimeter. However, the key challenge lies in making these tests more portable and suitable for field use, rather than being confined to laboratory settings. This is our primary focus, as we aim to bring advanced testing solutions directly to rural areas.
From Changlang's perspective, as testing technologies evolve, physical testing methods are expected to gradually replace traditional chemical analysis. For example, the chlorophyll nitrogen analyzer developed by Spectruril has promising prospects. When integrated with GPS systems, its application potential becomes even broader.
In our view, the soil nutrient rapid tester is different from conventional testing instruments. The speed of soil testing isn't just about the instrument’s speed, but also the efficiency of pre-treatment processes. Similarly, the cost isn’t only about the price of the device, but also the time required to complete the entire testing cycle. Therefore, we see the speedometer not only as a specialized photoelectric colorimeter, but also as a platform for low-cost, fast measurement technology and a complete set of rapid soil testing solutions.
Only through such comprehensive design can the developed speedometer truly serve rural communities effectively.
To fully understand the development of related technologies both domestically and internationally, we have created a soil nutrient speed measuring instrument based on the photoelectric colorimetric principle. Our goal is to address several key challenges: low cost, monochromatic light generation, light source selection, power supply design, colorimetric cell construction, protection from external light, moisture measurement, portability, and the integration of fertilization recommendations and support systems.
The soil nutrient rapid tester utilizes microprocessor technology, particularly a single-chip computer equipped with ashEPROM that includes A/D conversion. This ensures excellent performance at a low cost and allows for easy interface between the display and keyboard. The system primarily detects slow-changing photoelectric signals, which do not require high sampling rates. Therefore, an A/D 7135 converter is suitable for this purpose. A 128×64 LCD (33) display is used, capable of showing four lines of eight characters each, totaling 32 characters per screen. Additionally, the number of keyboard keys can be adjusted according to design needs. Basic microprocessor circuits, including address decoding, clock, and reset functions, are also incorporated into the system.
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