The Detection of Nitrogen Saturation for Real-Time Fertilization Management within a Grassland Ecosystem Article Swipe
Rowan Naicker
,
Onisimo Mutanga
,
Kabir Peerbhay
,
Naeem Agjee
·
YOU?
·
· 2023
· Open Access
·
· DOI: https://doi.org/10.3390/app13074252
YOU?
·
· 2023
· Open Access
·
· DOI: https://doi.org/10.3390/app13074252
Unfettered agricultural activities have severely degraded vast areas of grasslands over the last decade. To rehabilitate and restore the productivity in affected grasslands, rangeland management practices still institute vast nitrogen-based fertilization regimes. However, excessive fertilization can often have damaging environmental effects. Over-fertilization can lead to nitrogen saturation. Although early indicators of nitrogen saturation have been documented, research detailing the near-real-time nitrogen saturation status of grasslands is required to better facilitate management protocols and optimize biomass production within degraded grasslands. Hence, the aim of this study was to discriminate nitrogen-saturated tropical grasses grown under a diverse fertilization treatment trial, using Worldview-3 satellite imagery and decision tree techniques. To accomplish this, nitrogen-saturated plots were first identified through specific physiological-based criteria. Thereafter, Worldview-3 satellite imagery (400–1040 nm) and decision tree techniques were applied to discriminate between nitrogen-saturated and -unsaturated grassland plots. The results showed net nitrate (NO3−-N) concentrations and net pH levels to be significantly different (α = 0.05) between saturated and non-saturated plots. Moreover, the random forest model (overall accuracy of 91%) demonstrated a greater ability to classify saturated plots as opposed to the classification and regression tree method (overall accuracy of 79%). The most important variables for classifying saturated plots were identified as: the Red-Edge (705–745 nm), Coastal (400–450 nm), Near-Infrared 3 (838–950 nm), Soil-Adjusted Vegetation Index (SAVI) and the Normalized Difference Vegetation Index 3 (NDVI3). These results provide a framework to assist rangeland managers in identifying grasslands within the initial stages of nitrogen saturation. This will enable fertilization treatments to be adjusted in near-real-time according to ecosystem demand and thereby maintain the health and longevity of Southern African grasslands.
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Metadata
- Type
- article
- Language
- en
- Landing Page
- https://doi.org/10.3390/app13074252
- https://www.mdpi.com/2076-3417/13/7/4252/pdf?version=1679970623
- OA Status
- gold
- Cited By
- 7
- References
- 95
- Related Works
- 10
- OpenAlex ID
- https://openalex.org/W4361213290
All OpenAlex metadata
Raw OpenAlex JSON
- OpenAlex ID
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https://openalex.org/W4361213290Canonical identifier for this work in OpenAlex
- DOI
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https://doi.org/10.3390/app13074252Digital Object Identifier
- Title
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The Detection of Nitrogen Saturation for Real-Time Fertilization Management within a Grassland EcosystemWork title
- Type
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articleOpenAlex work type
- Language
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enPrimary language
- Publication year
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2023Year of publication
- Publication date
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2023-03-27Full publication date if available
- Authors
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Rowan Naicker, Onisimo Mutanga, Kabir Peerbhay, Naeem AgjeeList of authors in order
- Landing page
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https://doi.org/10.3390/app13074252Publisher landing page
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https://www.mdpi.com/2076-3417/13/7/4252/pdf?version=1679970623Direct link to full text PDF
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YesWhether a free full text is available
- OA status
-
goldOpen access status per OpenAlex
- OA URL
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https://www.mdpi.com/2076-3417/13/7/4252/pdf?version=1679970623Direct OA link when available
- Concepts
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Rangeland, Environmental science, Grassland, Ecosystem, Saturation (graph theory), Nitrogen, Vegetation (pathology), Agronomy, Agroforestry, Ecology, Mathematics, Biology, Chemistry, Organic chemistry, Medicine, Combinatorics, PathologyTop concepts (fields/topics) attached by OpenAlex
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7Total citation count in OpenAlex
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2025: 3, 2024: 3, 2023: 1Per-year citation counts (last 5 years)
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10Other works algorithmically related by OpenAlex
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