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Evaluation of a multi-sensor for measuring solution electrical conductivity in coir
Soil Science Society of America Journal ( IF 2.9 ) Pub Date : 2020-12-04 , DOI: 10.1002/saj2.20208
Teruhito Miyamoto 1 , Yukiyoshi Iwata 1 , Satoshi Inaba 2 , Koji Kameyama 1 , Miles Dyck 3
Affiliation  

The simultaneous measurements of both volumetric water content (θ) and electrical conductivity of pore solutions (ECw) are essential for nutrient solution management within soilless culture systems. The present study was carried out in order to evaluate a capacitance sensor (METER 5TE) for the measurement θ and ECw within coir. Following the evaluation of the spatial sensitivity of the 5TE sensor, a calibration experiment was executed with six levels of θ (0.30, 0.35, 0.40, 0.45, 0.50, and 0.55 m3 m−3) and four levels of KCl solutions (1.0, 3.0, 5.0, and 7.0 dS m−1). The measured relationship between θ and dielectric permittivity (εa) for coir significantly deviated from Topp's equation for organic soil, but was similar to the calibration equation for growing media from the sensor manufacturer and for peat soils. The Hilhorst (2000) model recommended by the manufacturer overestimated ECw within coir. On the other hand, accounting for EC dependency on the real part of the complex dielectric permittivity of the solution within the Hilhorst model will greatly improve ECw prediction. In contrast, the Rhoades (1976) model was more capable of describing the dependence of the apparent soil electrical conductivity (ECa) on θ and ECw for the coir samples for ECa < 2.9 dS m−1. Hence, when ECw−ECa−θ relations are known, the capacitance sensor is a powerful tool for horticultural practices because a single measurement can yield both θ and ECw.

中文翻译:

评估用于测量椰壳纤维中溶液电导率的多传感器

同时测量体积含水量 (θ) 和孔隙溶液的电导率 (EC w ) 对于无土栽培系统中的营养液管理至关重要。本研究旨在评估用于测量椰壳纤维内θ 和 EC w的电容传感器 (METER 5TE) 。在评估 5TE 传感器的空间灵敏度之后,使用六个水平的 θ(0.30、0.35、0.40、0.45、0.50 和 0.55 m 3 m -3)和四个水平的 KCl 溶液(1.0、 3.0、5.0 和 7.0 dS m -1 )。θ 与介电常数 (ε a) 椰壳纤维显着偏离有机土壤的 Topp 方程,但与传感器制造商的生长介质和泥炭土壤的校准方程相似。制造商推荐的 Hilhorst (2000) 模型高估了椰壳纤维中的 EC w。另一方面,考虑到 EC 依赖于 Hilhorst 模型中解的复介电常数的实部,将大大提高 EC w预测。相比之下,Rhoades (1976) 模型更能描述表观土壤电导率 (EC a ) 对EC a  < 2.9 dS m -1的椰壳纤维样品的θ 和 EC w的依赖性。因此,当 EC w −ECa -θ 关系是已知的,电容传感器是园艺实践的强大工具,因为单次测量可以产生 θ 和 EC w
更新日期:2020-12-04
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