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Effect of Cultivar on Chlorophyll Meter and Canopy Reflectance Measurements in Cucumber.

Published on Jan 16, 2020in Sensors3.031
· DOI :10.3390/S20020509
Romina de Souza4
Estimated H-index: 4
(UAL: University of Almería),
Rafael Grasso2
Estimated H-index: 2
+ 3 AuthorsFrancisco M. Padilla24
Estimated H-index: 24
(UAL: University of Almería)
Abstract
Optical sensors can be used to assess crop N status to assist with N fertilizer management. Differences between cultivars may affect optical sensor measurement. Cultivar effects on measurements made with the SPAD-502 (Soil Plant Analysis Development) meter and the MC-100 (Chlorophyll Concentration Meter), and of several vegetation indices measured with the Crop Circle ACS470 canopy reflectance sensor, were assessed. A cucumber (Cucumis sativus L.) crop was grown in a greenhouse, with three cultivars. Each cultivar received three N treatments, of increasing N concentration, being deficient (N1), sufficient (N2) and excessive (N3). There were significant differences between cultivars in the measurements made with both chlorophyll meters, particularly when N supply was sufficient and excessive (N2 and N3 treatments, respectively). There were no consistent differences between cultivars in vegetation indices. Optical sensor measurements were strongly linearly related to leaf N content in each of the three cultivars. The lack of a consistent effect of cultivar on the relationship with leaf N content suggests that a unique equation to estimate leaf N content from vegetation indices can be applied to all three cultivars. Results of chlorophyll meter measurements suggest that care should be taken when using sufficiency values, determined for a particular cultivar
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References49
Newest
#1Francisco M. Padilla (UAL: University of Almería)H-Index: 24
#2Marisa Gallardo (UAL: University of Almería)H-Index: 23
Last. Richard B. ThompsonH-Index: 25
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: Optimal nitrogen (N) management is essential for profitable vegetable crop production and to minimize N losses to the environment that are a consequence of an excessive N supply. Proximal optical sensors placed in contact with or close to the crop can provide a rapid assessment of a crop N status. Three types of proximal optical sensors (chlorophyll meters, canopy reflectance sensors, and fluorescence-based flavonols meters) for monitoring the crop N status of vegetable crops are reviewed, add...
34 CitationsSource
#1Xiaojun Liu (NAU: Nanjing Agricultural University)H-Index: 15
#2Richard B. Ferguson (NU: University of Nebraska–Lincoln)H-Index: 27
Last. Yan Zhu (NAU: Nanjing Agricultural University)H-Index: 62
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The successful development of an optimal canopy vegetation index dynamic model for obtaining higher yield can offer a technical approach for real-time and nondestructive diagnosis of rice (Oryza sativa L) growth and nitrogen (N) nutrition status. In this study, multiple rice cultivars and N treatments of experimental plots were carried out to obtain: normalized difference vegetation index (NDVI), leaf area index (LAI), above-ground dry matter (DM), and grain yield (GY) data. The quantitative rel...
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#1Francisco M. Padilla (UAL: University of Almería)H-Index: 24
#2M. Teresa Peña-Fleitas (UAL: University of Almería)H-Index: 9
Last. Richard B. Thompson (UAL: University of Almería)H-Index: 25
view all 4 authors...
Abstract Large nitrogen (N) fertilizer applications are a feature of intensive vegetable production systems, and optimal N management is required to maximize N use efficiency and minimize N losses. Vegetation indices (VIs) of canopy reflectance, measured with proximal sensors, are generally strongly related to crop N status. For practical application, sufficiency values that distinguish between N deficiency and sufficiency are required. In this work, sufficiency values of VIs for maximum crop gr...
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#2Rodney B. ThompsonH-Index: 27
Last. Marisa GallardoH-Index: 23
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#1Yasuyuki Wakiyama (National Agriculture and Food Research Organization)H-Index: 5
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#1István Monostori (MTA: Hungarian Academy of Sciences)H-Index: 5
#2Tamás Árendás (MTA: Hungarian Academy of Sciences)H-Index: 9
Last. Attila Vágújfalvi (MTA: Hungarian Academy of Sciences)H-Index: 13
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SPAD-502 (Minolta Ltd, Osaka Japan), a hand-held chlorophyll meter is widely used in the synchronization of N supply with actual crop demand, however it is also known, that genotype and environment may effect SPAD value. Consequently, the aim of this study was to evaluate the genetic and environmental variation in SPAD value and to determine the relationship between SPAD value at heading (GS 59) and grain yield. Field experiments were conducted in three consecutive cropping seasons between 2012 ...
19 CitationsSource
#1Francisco M. Padilla (UAL: University of Almería)H-Index: 24
#2M. Teresa Peña-Fleitas (UAL: University of Almería)H-Index: 9
Last. Richard B. Thompson (UAL: University of Almería)H-Index: 25
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Abstract Sustainable N management of intensive vegetable crops requires accurate and timely on-farm assessment of crop N status. Proximal fluorescence-based sensors are promising tools for monitoring crop N status, by providing non-destructive optical measurements of N-sensitive indicator compounds such as chlorophyll and flavonols. The ability of the Multiplex ® fluorescence sensor to determine crop N status was evaluated in two indeterminate cucumber crops grown in contrasting seasons (autumn ...
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#1Zhao-Feng Yuan (NAU: Nanjing Agricultural University)H-Index: 7
#2Syed Tahir Ata-Ul-Karim (NAU: Nanjing Agricultural University)H-Index: 20
Last. Xiaojun Liu (NAU: Nanjing Agricultural University)H-Index: 15
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Abstract Various indices established on a portable SPAD-502 meter can serve as indicators of the nitrogen status of a plant. We compared di-positional SPAD readings and indices with several reliable nitrogen indicators during vegetative growth stage of rice ( Oryza sativa L.) and developed a prediction model for diagnosing nitrogen status. Three field experiments were conducted in Jiangsu province of east China during 2013 and 2014. Different nitrogen application rates were used to generate cont...
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#1Ben ZhaoH-Index: 7
#2Zhandong LiuH-Index: 7
Last. Aiwang DuanH-Index: 15
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Abstract Rapid, accurate and dynamic diagnosis of nitrogen (N) status is essential for evaluating plant vigor, predicting crop production and optimizing N management in winter barley ( Hordeum vulgare L.). The objectives of this study were to determine the correlations between N nutrition index (NNI), leaf N gradient and chlorophyll meter (CM) readings gradient for different leaf positions and to compare the stability of the relationships between NNI and CM readings as well as between NNI and po...
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#1Althea A. ArchMiller (AU: Auburn University)H-Index: 4
#2Lisa J. Samuelson (AU: Auburn University)H-Index: 27
Abstract Soil respiration ( R S ) is one of the largest fluxes of net ecosystem exchange and is related to both soil climate and vegetatively driven substrate supply at various spatial and temporal scales. Relationships between the intra-annual variation in R S and abiotic and biotic variables were examined across diverse longleaf pine (Pinus palustris Mill.) forests to better understand factors related to R S in these low density, spatially heterogeneous forests. Soil respiration, soil temperat...
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#1Francisco M. Padilla (UAL: University of Almería)H-Index: 24
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Abstract Optimal crop nitrogen (N) management is required to minimize N losses to the environment in vegetable crop production. There are several approaches based on soil and plant monitoring that can assist to improve N management. These include soil monitoring, destructive (tissue N analysis, petiole sap nitrate (NO3−) analysis) and non-destructive (optical sensors) crop-based methods, and portable rapid analysis systems. The most promising optical sensors for guiding N management in vegetable...
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