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Title: A novel remote sensing approach for prediction of maize yield under different conditions of nitrogen fertilization
Author: Vergara Díaz, Omar
Zaman Allah, Mainassara
Masuka, Benhildah
Hornero, Alberto
Zarco Tejada, Pablo
Prasanna, Boddupalli M.
Cairns, Jill E.
Araus Ortega, José Luis
Keywords: Blat de moro
Compostos de nitrogen
Fertilitat del sòl
Nitrogen compounds
Soil fertility
Issue Date: 18-May-2016
Publisher: Frontiers Media
Abstract: Maize crop production is constrained worldwide by nitrogen (N) availability and particularly in poor tropical and subtropical soils. The development of affordable high-throughput crop monitoring and phenotyping techniques is key to improving maize cultivation under low-N fertilization. In this study several vegetation indices (VIs) derived from Red-Green-Blue (RGB) digital images at the leaf and canopy levels are proposed as low-cost tools for plant breeding and fertilization management. They were compared with the performance of the normalized difference vegetation index (NDVI) measured at ground level and from an aerial platform, as well as with leaf chlorophyll content (LCC) and other leaf composition and structural parameters at flowering stage. A set of 10 hybrids grown under five different nitrogen regimes and adequate water conditions were tested at the CIMMYT station of Harare (Zimbabwe). Grain yield and leaf N concentration across N fertilization levels were strongly predicted by most of these RGB indices (with R2~ 0.7), outperforming the prediction power of the NDVI and LCC. RGB indices also outperformed the NDVI when assessing genotypic differences in grain yield and leaf N concentration within a given level of N fertilization. The best predictor of leaf N concentration across the five N regimes was LCC but its performance within N treatments was inefficient. The leaf traits evaluated also seemed inefficient as phenotyping parameters. It is concluded that the adoption of RGB-based phenotyping techniques may significantly contribute to the progress of plant breeding and the appropriate management of fertilization.
Note: Reproducció del document publicat a:
It is part of: Frontiers in Plant Science, 2016, vol. 7, p. 666
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ISSN: 1664-462X
Appears in Collections:Articles publicats en revistes (Biologia Evolutiva, Ecologia i Ciències Ambientals)

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