Non-invasive spectral detection of the beneficial effects of Bradyrhizobium spp. and plant growth-promoting rhizobacteria under different levels of nitrogen application on the biomass, nitrogen status, and yield of peanut cultivars
High-throughput phenotyping using spectral reflectance measurements offers the potential to provide more information for making better-informed management decisions at the crop canopy level in real time. The aim of this study was to investigate the suitability of hyperspectral reflectance measurements of the crop canopy for the assessment of biomass, nitrogen concentration, nitrogen uptake, relative chlorophyll contents, and yield in 2 peanut cultivars, Giza 5 and Giza 6. Peanuts were grown under field conditions and subjected to 3 doses of nitrogen fertilizer with or without the application of 2 bio-fertilizers, Bradyrhizobium spp. or plant growth-promoting rhizobacteria. Simple linear regression of normalized difference spectral indices and partial least square regression (PLSR) were employed to develop predictive models to estimate the measured parameters. The tested spectral Non-invasive spectral detection of the beneficial effects of Bradyrhizobium spp. and plant growth-promoting rhizobacteria under different levels of nitrogen application on the biomass, nitrogen status, and yield of peanut cultivars Salah Elsayed1*, Mohamed Elhoweity1, Salah El-Hendawy2,4, Urs Schmidhalter3 1. University of Sadat City - Environmental Studies and Research Institute - Department of Evaluation and Natural Resources - Sadat, Egypt. 2. King Saud University - College of Food and Agriculture Sciences - Department of Plant Production - Riyadh, Saudi Arabia. 3. Technische Universität München - Department of Plant Sciences - Freising, Germany. 4. Suez Canal University - Faculty of Agriculture - Department of Agronomy - Ismailia, Egypt. *Corresponding author:
yahoo.com Received: Mar. 11, 2016 – Accepted: May 12, 2016 reflectance indices were significantly related to all measured parameters with R2 of up to 0.89. The spectral reflectance index values differed at the same level of nitrogen fertilizer, as well as among the 3 levels of nitrogen fertilizer application for inoculation with Bradyrhizobium and co-inoculation with Bradyrhizobium and plant growth-promoting rhizobacteria. The calibration models of PLSR data analysis further improved the results, with R2 values reaching 0.95. The overall results of this study indicate that hyperspectral reflectance measurements monitoring peanut plants enable rapid and non-destructive assessment of biomass, nitrogen status, and yield parameters of peanut cultivars subjected to various agronomic treatments.
، العدد .
biofertilizer, phenomics, phenotyping, precision agriculture, spectral reflectance
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