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Article

The Use of Chlorophyll Meters to Assess Crop N Status and Derivation of Sufficiency Values for Sweet Pepper

1
Department of Agronomy, University of Almeria, Carretera de Sacramento s/n, 04120 La Cañada de San Urbano, Almería, Spain
2
CIAIMBITAL Research Centre for Mediterranean Intensive Agrosystems and Agrifood Biotechnology, University of Almeria, 04120 La Cañada de San Urbano, Almería, Spain
3
Estación Experimental INIA Salto Grande, Instituto Nacional de Investigación Agropecuaria (INIA), Camino al Terrible s/n, 50000 Salto, Uruguay
*
Author to whom correspondence should be addressed.
Sensors 2019, 19(13), 2949; https://doi.org/10.3390/s19132949
Received: 15 May 2019 / Revised: 19 June 2019 / Accepted: 1 July 2019 / Published: 4 July 2019
(This article belongs to the Special Issue Proximal Sensing for Nitrogen Management)
Chlorophyll meters are promising tools for improving the nitrogen (N) management of vegetable crops. To facilitate on-farm use of these meters, sufficiency values that identify deficient and sufficient crop N status are required. This work evaluated the ability of three chlorophyll meters (SPAD-502, atLEAF+, and MC-100) to assess crop N status in sweet pepper. It also determined sufficiency values for optimal N nutrition for each meter for pepper. The experimental work was conducted in a greenhouse, in Almería, Spain, very similar to those used for commercial production, in three different crops grown with fertigation. In each crop, there were five treatments of different N concentration in the nutrient solution, applied in each irrigation, ranging from a very deficient to very excessive N supply. In general, chlorophyll meter measurements were strongly related to crop N status in all phenological stages of the three crops, indicating that these measurements are good indicators of the crop N status of pepper. Sufficiency values determined for each meter for the four major phenological stages were consistent between the three crops. This demonstrated the potential for using these meters with sufficiency values to improve the N management of commercial sweet pepper crops. View Full-Text
Keywords: atLEAF; CCI; greenhouse; horticulture; nitrogen nutrition index; proximal optical sensors; SPAD; vegetable crops atLEAF; CCI; greenhouse; horticulture; nitrogen nutrition index; proximal optical sensors; SPAD; vegetable crops
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MDPI and ACS Style

de Souza, R.; Peña-Fleitas, M.T.; Thompson, R.B.; Gallardo, M.; Grasso, R.; Padilla, F.M. The Use of Chlorophyll Meters to Assess Crop N Status and Derivation of Sufficiency Values for Sweet Pepper. Sensors 2019, 19, 2949. https://doi.org/10.3390/s19132949

AMA Style

de Souza R, Peña-Fleitas MT, Thompson RB, Gallardo M, Grasso R, Padilla FM. The Use of Chlorophyll Meters to Assess Crop N Status and Derivation of Sufficiency Values for Sweet Pepper. Sensors. 2019; 19(13):2949. https://doi.org/10.3390/s19132949

Chicago/Turabian Style

de Souza, Romina, M. T. Peña-Fleitas, Rodney B. Thompson, Marisa Gallardo, Rafael Grasso, and Francisco M. Padilla 2019. "The Use of Chlorophyll Meters to Assess Crop N Status and Derivation of Sufficiency Values for Sweet Pepper" Sensors 19, no. 13: 2949. https://doi.org/10.3390/s19132949

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