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The Soil Composition Analyzer System software includes a small expert system that guides fertilization based on soil type, soil fertility, crop type and expected yield. The results of measurement or analysis can be printed out on a standard printer or mini-printer through the printer interface. The measurement data can also be sent to the host computer through the serial communication interface of the microcomputer so that the agricultural management department can establish a database for the soil management of the region.
The measurement of soil composition is in principle based on the Rum-Beer law. The substance absorbs light, and its light-absorbing ability is expressed by the absorbance A. Absorbance A is defined as A bg.
In the formula: A is absorbance, work. For the incident light intensity, the intensity of transmitted light. The physical meaning of Rum-Beer's law is that when a bundle of parallel monochromatic light passes through a uniform colored solution, the absorbance of the solution is proportional to the product of the concentration of the light-absorbing material and the thickness of the liquid layer. The mathematical expression is A bg ( / Worker) Abco
In the formula: a is the proportionality constant, is called the light absorption coefficient, b is the liquid layer thickness, c is the concentration of the colored material solution.
When using a soil composition analyzer to measure the soil composition, in order to improve the measurement accuracy, the most important thing is that under the same measurement conditions, the photoelectric sensor should have a stable output. If this method is analyzed theoretically, the light intensity of the light bulb can be kept constant as long as the current through the incandescent bulb can be controlled constantly, or the voltage across the lamp is constant, and the output voltage of the photoelectric sensor should also be very stable. However, in actual operation, it is found that when the current through the bulb is constant, the output of the photoelectric sensor is not stable around a certain value, but it drifts in a very small range, and often continues to rise. And then continue to decline, again and again, which shows that the light intensity is essentially fluctuating.
Through the details of the operation of the soil composition analyzer, it is only to improve the clarity of the test, so as to apply reasonable fertilization for the tested soil, so as to achieve the maximum benefit of formula fertilization, promote the development of modern agriculture, and promote the rural economy. The development and construction.
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