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Agronomic and economic potential of vegetation indices for rice N recommendations under organic and mineral fertilization in mediterranean regions

AuthorsMoreno-García, Beatriz ; Casterad Seral, María Auxiliadora ; Guillén, Mónica ; Quílez Sáez de Viteri, Dolores
Keywordsflooded rice
pig slurry
aerial remote sensing
vegetation indices
N recommendation approach
Mediterranean conditions
Issue DateNov-2018
PublisherMolecular Diversity Preservation International
CitationMoreno-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 210 (12): 1908 (2018)
AbstractRice (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.
Description21 Pags.- 5 Figs.- 5 Tabls. © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Publisher version (URL)https://doi.org/10.3390/rs10121908
Appears in Collections:(EEAD) Artículos
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