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Article

Agronomic and Economic Potential of Vegetation Indices for Rice N Recommendations under Organic and Mineral Fertilization in Mediterranean Regions

1
Unidad de Suelos y Riegos (asociada a EEAD-CSIC), Centro de Investigación y Tecnología Agroalimentaria de Aragón, Avda Montañana 930, 50059 Zaragoza, Spain
2
231 ENGR Hall, Biological &Agricultural Engineering, Univ. of Arkansas, Fayetteville, AR 72701, USA
*
Author to whom correspondence should be addressed.
Remote Sens. 2018, 10(12), 1908; https://doi.org/10.3390/rs10121908
Received: 18 October 2018 / Revised: 27 November 2018 / Accepted: 27 November 2018 / Published: 29 November 2018
(This article belongs to the Special Issue Remote Sensing for Precision Nitrogen Management)
Rice (Oryza sativa L.) farmers in Mediterranean regions usually apply organic or mineral fertilizers before seeding that are supplemented with mineral nitrogen (N) later in the season. In general, the midseason N is applied without consideration of the actual crop N status, which may lead to over-fertilization and associated environmental problems. Thus, the purpose of this study was to design and evaluate a N recommendation approach using aerial images for Mediterranean paddy rice systems. A two-year rice field experiment was established in northeastern Spain, with different rates of pig slurry (PS) and mineral N fertilizer. Multispectral aerial images were taken at the rice booting stage, and several vegetation indices (VIs) were calculated. The VIs showed strong relationships with yield and the relations significantly differed between the PS and mineral fertilization treatments. The strongest relations with yield were obtained with gMCARINIR, proposed in this study, (R2 = 0.67), GNDVI (R2 = 0.64) and MCARINIR (R2 = 0.64), indicating the importance of including the green band information. The N recommendation approach generated using the VIs information showed a high success (87.5%) in the preliminary evaluation. The economic and environmental analysis showed that this approach provides a useful tool when compared to the usual farmer practices. View Full-Text
Keywords: flooded rice; pig slurry; aerial remote sensing; vegetation indices; N recommendation approach; Mediterranean conditions flooded rice; pig slurry; aerial remote sensing; vegetation indices; N recommendation approach; Mediterranean conditions
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MDPI and ACS Style

Moreno-García, B.; Casterad, M.A.; Guillén, M.; Quílez, D. Agronomic and Economic Potential of Vegetation Indices for Rice N Recommendations under Organic and Mineral Fertilization in Mediterranean Regions. Remote Sens. 2018, 10, 1908. https://doi.org/10.3390/rs10121908

AMA Style

Moreno-García B, Casterad MA, Guillén M, Quílez D. Agronomic and Economic Potential of Vegetation Indices for Rice N Recommendations under Organic and Mineral Fertilization in Mediterranean Regions. Remote Sensing. 2018; 10(12):1908. https://doi.org/10.3390/rs10121908

Chicago/Turabian Style

Moreno-García, Beatriz; Casterad, Mª A.; Guillén, Mónica; Quílez, Dolores. 2018. "Agronomic and Economic Potential of Vegetation Indices for Rice N Recommendations under Organic and Mineral Fertilization in Mediterranean Regions" Remote Sens. 10, no. 12: 1908. https://doi.org/10.3390/rs10121908

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