Approach to Petiole Sap Nutritional Diagnosis Method by Empirical Model Based on Climatic and Growth Parameters

Alfonso Llanderal; Pedro García-Caparrós; José Pérez-Alonso; Juana  Isabel Contreras; María  Luz Segura; Juan Reca; María  Teresa Lao

doi:10.3390/agronomy10020188

Agronomy (Jan 2020)

Approach to Petiole Sap Nutritional Diagnosis Method by Empirical Model Based on Climatic and Growth Parameters

Alfonso Llanderal,
Pedro García-Caparrós,
José Pérez-Alonso,
Juana Isabel Contreras,
María Luz Segura,
Juan Reca,
María Teresa Lao

Affiliations

Alfonso Llanderal: Faculty of Technical Education for Development, Catholic University of Santiago of Guayaquil, Av. C. J. Arosemena Km. 1.5, 09014671 Guayaquil, Ecuador
Pedro García-Caparrós: Agronomy Department of Superior School Engineering, University of Almeria, CIAIMBITAL, Agrifood Campus of International Excellence, ceiA3. Ctra. Sacramento s/n, La Cañada de San Urbano, 04120 Almería, Spain
José Pérez-Alonso: Engineering Department of Higher Engineering School, University of Almeria, Ctra. Sacramento s/n, La Cañada de San Urbano, 04120 Almería, Spain
Juana Isabel Contreras: Institute of Research and Training in Agriculture and Fishery (IFAPA), Junta of Andalusia, La Mojonera, 04745 Almería, Spain
María Luz Segura: Institute of Research and Training in Agriculture and Fishery (IFAPA), Junta of Andalusia, La Mojonera, 04745 Almería, Spain
Juan Reca: Engineering Department of Higher Engineering School, University of Almeria, Ctra. Sacramento s/n, La Cañada de San Urbano, 04120 Almería, Spain
María Teresa Lao: Agronomy Department of Superior School Engineering, University of Almeria, CIAIMBITAL, Agrifood Campus of International Excellence, ceiA3. Ctra. Sacramento s/n, La Cañada de San Urbano, 04120 Almería, Spain

DOI: https://doi.org/10.3390/agronomy10020188
Journal volume & issue: Vol. 10, no. 2
p. 188

Abstract

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The aim of this work is to evaluate the relationship between the nutrient concentration in petiole sap and different agronomic and climatic variables for a tomato crop grown in a greenhouse in Mediterranean conditions. In addition, the persistence of the nutrient concentration in petiole sap was investigated with the aim of determining the sampling period that implies the best trade-off nutritional information. The experiment consisted of the selection of 20 sampling points inside the greenhouse. The samples of petiole, fully expanded leaf, and soil solution samples were collected weekly from 86 to 163 days after transplanting. Chloride, NO3−-N, H2PO4−-P, Na+, K+, Ca2+, and Mg2+ concentrations were determined in petiole sap and soil solution obtained by suction cups. Nitrogen, P, K, Cl, and Na concentrations were also determined in leaf. Finally, the petiole sap nutritional diagnosis method is the highest sensitive nutritional diagnosis method which compares soil solution and nutrient leaf content related to yield, and the statistical analysis performed in this research demonstrates that crop evapotranspiration (ETc), vapor pressure deficit (DPV), and leaf area index (LAI) are considered the most significant variables that allow the development of these empirical prediction models regarding nutrient concentration in petiole sap.

Published in Agronomy

ISSN: 2073-4395 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Agriculture
Website: http://www.mdpi.com/journal/agronomy

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