Abstract
The acquisition of nutrient data on a precise scale has played a vital role in nutrient management processes for soils. However, the lack of rapid precise and multi-index detection techniques for soil macronutrient contents hinders both rational fertilization and cost reduction. In this paper, a rapid detection method and device were devised, combining capillary electrophoresis (CE) and capacitively coupled contactless conductivity detection (C4D), and presented to detect macronutrient contents of soil. The device consisted of a capillary channel, C4D detector, high-voltage system, etc. It separated macronutrient ions using capillary electrophoresis and then measured the ion concentration based on the C4D principle. Lime concretion black soil samples from a complete field were collected and detected. NO3−, NH4+, H2PO4− and K+ in sample solutions could be detected in 5 min with relative standard deviations (RSDs) from 1.0 to 7.51%. The injection voltage was set to 10 kV for 5 s, and the separation voltage was set to 14 kV. This demonstrated the excellent performance of the C4D device on the detection of soil macronutrients, which could help to guide fertilization operations more effectively.
Highlights
Soil macronutrient (N, P and K) management has generally been tailored, to the extent possible, on a scale of tens of hectares [1]
As a result, aiming at achieving the growth in crop yield and reducing polluting emissions, it has become urgent to monitor the fertility of soils on a more precise scale in time and space
The availability of soil macronutrients N, P and K in the ionic form of NO3 −, NH4 +, H2 PO4 − and K+ was deemed to be of special interest [2], as these ions are directly available for plant roots
Summary
Soil macronutrient (N, P and K) management has generally been tailored, to the extent possible, on a scale of tens of hectares [1]. As a result, aiming at achieving the growth in crop yield and reducing polluting emissions, it has become urgent to monitor the fertility of soils on a more precise scale in time and space. Through thorough understanding of soil fertility on a more precise scale could a reasonable local fertilization strategy be formulated, leading to the reduction of pollution and the improvement of agricultural efficiency. Traditional soil detection methods have mainly relied on laboratory testing, which requires complicated and long-term pretreatment processes and large, expensive soil sample testing instruments. It was essential to simultaneously adopt several large soil testing instruments, e.g., atomic absorption spectrometers, Chemosensors 2022, 10, 84.
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