10.57647/ijrowa-2026-17438

Vegetative indices for evaluation of the agronomic performance of black oats irrigated with slaughterhouse effluent

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  • Felipe Oliva de Godoy1,
  • Ana Paula Pereira Carvalho2,
  • Lucas Renato Trevisan1,
  • Lisiane Brichi1,
  • Fabrício Rossi2,
  • Tamara Maria Gomes*2,
  1. Department of Biosystems Engineering, Luiz de Queiroz College of Agriculture, University of São Paulo, Brazil
  2. Department of Biosystems Engineering, Faculty of Animal Science and Food Engineering, University of São Paulo, Brazil
Vegetative indices for evaluation of the agronomic performance of black oats irrigated with slaughterhouse effluent

Received: 2024-10-30

Revised: 2024-11-13

Accepted: 2025-08-16

Published in Issue 2025-08-31

Copyright (c) -1 Felipe Oliva de Godoy, Ana Paula Pereira Carvalho, Lucas Renato Trevisan, Lisiane Brichi, Fabrício Rossi, Tamara Maria Gomes (Author)

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This work is licensed under a Creative Commons Attribution 4.0 International License.

How to Cite

Oliva de Godoy, F., Pereira Carvalho, A. P., Trevisan, L. R., Brichi, L., Rossi, F., & Gomes, T. M. (2025). Vegetative indices for evaluation of the agronomic performance of black oats irrigated with slaughterhouse effluent. International Journal of Recycling of Organic Waste in Agriculture. https://doi.org/10.57647/ijrowa-2026-17438
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Abstract

Purpose: The expansion of the global population has resulted in an increased demand for food production. This, coupled with the scarcity of natural resources aggravated by the climate crisis, makes technology a necessary tool to ensure productivity for crops. This research aimed to evaluate the agronomic performance of black oat irrigated with varying doses of Treated Slaughterhouse Effluent (TSE), through the determination and analysis of vegetation indices.

Method: The experiment was conducted in the field using a five-treatment, four-replication randomized block design with repeated measures over time. Fresh mass (FMAP) and aerial dry mass (DMAP) of the aerial part, leaf area index (LAI) and leaf nutritional status were used as indicators of agronomic performance, as well as the relative chlorophyll index (CRF), which were correlated with indices (NDVI: Normalized Difference Vegetation Index, IRVI: Inverse Ratio Vegetation Index, and RVI: Ratio Vegetation Index).

Results: There were strong correlations between the indices studied with the biometric parameters of the crop, mainly, the NDVI x DMAP (R² = 0.92) and the RVI x FMAP (R² = 0.89). The indices were also able to differentiate the stages of crop development and could be used as a management tool for agricultural practices.

Conclusion: There were no changes in the biometric parameters, nutritional status and indices of the irrigated crop with different concentrations of TSE; therefore, the dose of 25% is recommended, for having presented a saving of 100% of the synthetic nitrogen, replacing 25% of a fresh water source, without an excess of N, thus avoiding the leaching risks.

Highlihgts

·       There are strong correlations between vegetation indices and biometric parameters 

·       The indices were able to differentiate the phenological stages of the crop

·       Treated slaughterhouse effluent showed potential for use in crop irrigation

Keywords

  • Avena strigosa Schreb,
  • NDVI,
  • Nitrogen,
  • Remote sensing,
  • Water reuse
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