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Article

Use of a Portable Rapid Analysis System to Measure Nitrate Concentration of Nutrient and Soil Solution, and Plant Sap in Greenhouse Vegetable Production

1
Department of Agronomy, University of Almeria, Ctra. Sacramento s/n, La Cañada de San Urbano, 04120 Almeria, Spain
2
CIAIMBITAL Research Centre for Mediterranean Intensive Agrosystems and Agrifood Biotechnology, University of Almeria, La Cañada de San Urbano, 04120 Almeria, Spain
3
University of Costa Rica, Sede Regional de Guanacaste, Liberia 50101, Costa Rica
*
Author to whom correspondence should be addressed.
Academic Editor: Karsten Schmidt
Agronomy 2021, 11(5), 819; https://doi.org/10.3390/agronomy11050819
Received: 11 March 2021 / Revised: 18 April 2021 / Accepted: 19 April 2021 / Published: 22 April 2021
(This article belongs to the Special Issue Management of Crops Fertigation)
A rapid analysis ion-selective electrode (ISE) system for measurement of [NO3] in nutrient solution (NS), soil solution (SS) and petiole sap (PS) was evaluated. For each material, there were 797–2010 samples from 5 to 6 different crops, and from 2 to 4 different species. Accuracy was evaluated by linear regression (LR) with laboratory analysis (automated colorimetry, Cd reduction), and by relative error (RE), the average percentage deviation from laboratory analysis. For NS, the LR was y = 0.982x + 0.76, R² = 0.962 (n = 2010), for combined data from 5 crops (3 pepper, 2 cucumber). For SS, the LR was y = 0.975x + 1.13, R² = 0.965 (n = 797), for combined data from 5 crops (3 pepper, 2 cucumber). For undiluted PS, the LR relationship was y = 0.742x + 168.02, R² = 0.892 (n = 1425), for combined data from 6 crops (3 pepper, 2 cucumber, 1 melon). The underestimation was most pronounced at [NO3] of >1500 mg NO3–N L−1. For diluted petiole sap (dilution by 10 for pepper and melon, 5 for other species), the LR relationship was y = 1.010x + 99.26, R² = 0.927 (n = 1182), for combined data from 6 crops (2 pepper, 2 cucumber, 1 melon, 1 tomato). RE values for all measurements in composite datasets were 14%, 22%, 24% and 25% for NS, SS, undiluted PS and diluted PS respectively, and they were lower in concentrations most likely to be measured in practical on-farm work. The ISE system measured [NO3] in NS, SS and diluted PS with sufficient accuracy to effectively guide on-farm decision making. View Full-Text
Keywords: ion-selective electrode; petiole sap analysis; N fertilizer management; quick test; on-farm; greenhouse ion-selective electrode; petiole sap analysis; N fertilizer management; quick test; on-farm; greenhouse
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MDPI and ACS Style

Peña-Fleitas, M.T.; Gallardo, M.; Padilla, F.M.; Rodríguez, A.; Thompson, R.B. Use of a Portable Rapid Analysis System to Measure Nitrate Concentration of Nutrient and Soil Solution, and Plant Sap in Greenhouse Vegetable Production. Agronomy 2021, 11, 819. https://doi.org/10.3390/agronomy11050819

AMA Style

Peña-Fleitas MT, Gallardo M, Padilla FM, Rodríguez A, Thompson RB. Use of a Portable Rapid Analysis System to Measure Nitrate Concentration of Nutrient and Soil Solution, and Plant Sap in Greenhouse Vegetable Production. Agronomy. 2021; 11(5):819. https://doi.org/10.3390/agronomy11050819

Chicago/Turabian Style

Peña-Fleitas, M. T., Marisa Gallardo, Francisco M. Padilla, Alejandra Rodríguez, and Rodney B. Thompson 2021. "Use of a Portable Rapid Analysis System to Measure Nitrate Concentration of Nutrient and Soil Solution, and Plant Sap in Greenhouse Vegetable Production" Agronomy 11, no. 5: 819. https://doi.org/10.3390/agronomy11050819

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