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Open AccessArticle

Multi-Channel Optoelectronic Measurement System for Soil Nutrients Analysis

1
Department of Electrical Engineering, Henan Agricultural University, Zhengzhou 450002, China
2
State Key Laboratory of Wheat and Maize Crop Science, Zhengzhou 450002, China
3
Department of Physics, University of Nairobi, 30197 Nairobi, Kenya
*
Author to whom correspondence should be addressed.
Electronics 2019, 8(4), 451; https://doi.org/10.3390/electronics8040451
Received: 18 March 2019 / Revised: 17 April 2019 / Accepted: 18 April 2019 / Published: 20 April 2019
(This article belongs to the Special Issue Recent Advances in Biometrics and its Applications)
To solve the problems that occur when farmers overuse chemical fertilizers, it is necessary to develop rapid and efficient portable measurement systems for the detection and quantification of nitrogen (N), phosphorus (P), and potassium (K) in soil. Challenges arise from the use of currently available portable instruments which only have a few channels, namely measurement and the reference channels. We report on a home-built, multichannel, optoelectronic measurement system with automatically switching light sources for the detection of N, P, K content in soil samples. This optoelectronic measurement system consists of joint LED light sources with peak emission wavelengths of 405 nm, 660 nm, and 515 nm, a photodiode array, a circuit board with a microcontroller unit (MCU), and a liquid-crystal display (LCD) touch screen. The straightforward principle for rapid detection of the extractable nutrients (N, P, K) was well-established, and characterization of the designed measurement system was done. Using this multi-channel measurement system, available nutrients extracted from six soil samples could be measured simultaneously. The absorbance compensation, concentration calibration, and nutrition measurements were performed automatically to achieve high consistency across six channels. The experimental results showed that the cumulative relative standard deviations of 1.22%, 1.27%, and 1.00% were obtained from six channels with known concentrations of standard solutions, respectively. The coefficients of correlation for the detection of extracted nutrients of N, P, K content in soil samples using both the proposed method and conventional lab-based method were 0.9010, 0.9471, and 0.8923, respectively. Experimental results show that this optoelectronic measurement system can perform the measurement of N, P, K contents of six soil samples simultaneously and may be used as an actual tool in determining nutrients in soil samples with an improvement in detection efficiency. View Full-Text
Keywords: microcontroller; multichannel; optoelectronics; soil nutrients; extracted nutrient microcontroller; multichannel; optoelectronics; soil nutrients; extracted nutrient
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MDPI and ACS Style

Ma, L.; Li, Z.; Birech, Z.; Li, S.; Yang, Y.; Zhang, W.; Hu, J. Multi-Channel Optoelectronic Measurement System for Soil Nutrients Analysis. Electronics 2019, 8, 451.

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