Igor de Oliveira Paiva

@uenf.br

Núcleo de desenvolvimento de insumos biológicos para agricultura - NUDIBA/LSOL
Universidade Estadual do Norte Fluminense

Igor de Oliveira Paiva


                  Download Compact PDF  
https://researchid.co/igoroliveira4000

RESEARCH, TEACHING, or OTHER INTERESTS

Agronomy and Crop Science, Agricultural and Biological Sciences
4

Scopus Publications

113

Scholar Citations

4

Scholar h-index

3

Scholar i10-index

Scopus Publications

  • Biochar and Ammonium Nitrate Synergies: Enhancing Nitrogen Availability and Maize Growth in Oxisols
    Igor de Oliveira Paiva, Everton Geraldo de Morais, Carlos Alberto Silva
    Agronomy, 2025
    Effective nitrogen (N) management and the development of novel N fertilizers are essential for enhancing maize growth in tropical soils. One strategy to increase N use efficiency is the use of organic matrices as a source of N or their combination with the application of mineral N sources. Among these organic matrices, biochar emerges as a highly promising option for optimizing N use efficiency. Thus, the aim of this study was to evaluate the effects of different feedstocks, their respective biochars, and their combination with N on the dynamics and uptake of N by maize plants in two contrasting Oxisols. A 30-day greenhouse experiment was conducted using maize grown under treatments with four feedstocks (bamboo, sunflower cake, chicken manure, and shrimp carcass) and their respective biochars. The biochars were applied with or without ammonium nitrate (AN), alongside negative (no N) and positive (AN-only) controls. Ammonium and nitrate levels were analyzed in the soil solution at 1 and 15 days and in the whole soil before and after cultivation. Maize biomass production and shoot N accumulation were also evaluated at the end of the experiment. Among the main results, it was observed that soil type played a key role in available N, maize nutrition, and growth. In the medium-textured Oxisol studied, native soil organic matter partially met maize N requirements due to high content of available N observed. Biochars influenced N availability by increasing nitrate-N prevalence in the soil solution. Although whole-soil N levels were sufficient for robust maize growth, post-cultivation residual N remained low (<75 mg kg−1), indicating the need for supplemental N fertilization for plants grown in pots. In the medium-textured Oxisol, bamboo or sunflower cake biochar combined with AN increased biomass production by ~12% compared with AN alone. Similarly, in the clayey Oxisol, maize fertilized with sunflower cake or shrimp carcass biochar—regardless of AN addition—outperformed AN-fertilized plants by 19–30%. Thus, this study highlights the potential of integrating biochar with N fertilization to improve soil and solution N availability and increase N use efficiency by maize plants.
  • Biochar N Content, Pools and Aromaticity as Affected by Feedstock and Pyrolysis Temperature
    Igor de Oliveira Paiva, Everton Geraldo de Morais, Keiji Jindo, Carlos Alberto Silva
    Waste and Biomass Valorization, 2024
    Forms and availability of nitrogen (N) in biochars are influenced by both feedstock and pyrolysis temperature. We conducted an assessment to examine how feedstock composition and pyrolysis temperature impact crucial properties and nitrogen (N) content and distributions within biochars. We subjected feedstocks with 0.2% to 8.9% N to pyrolysis at 300 °C and 750 °C. Biochars derived from different feedstock types (n = 11) were assessed for pH, electrical conductivity (EC), total C, water-soluble C (WSC) content, yield, total and available N content, as well as for C and N retention. We examined the aromaticity of the biochars by analyzing the ratio of specific FTIR spectra bands. As the pyrolysis temperature increased, we observed a decrease in yield, total N content, and N in the forms of N-NH4+ and N-NO3−. Concurrently, with the intensification of the charring process, the WSC content experienced a sharp reduction. Most biochars experienced an increase in carbon (C) content along with a notable decrease in total nitrogen (N) content as the pyrolysis process intensified. As charring conditions intensified, available N forms, such as N-NH4+ and N-NO3−, were lost. Biochars obtained from pine bark, eucalyptus sawdust, sugarcane bagasse, and bamboo exhibited high C content, low N content, and C:N ratios exceeding 100:1. The losses of C and N were independent of each other, with N chemical species demonstrating higher volatility compared to C compounds. At a temperature of 300 °C, the extent of N loss during pyrolysis depended on the feedstock, and the N content in the resulting biochar could be predicted based on the N content in the original feedstock. Pyrolysis at 300 °C retained a substantial amount of N in biochars derived from chicken manure, castor oil cake, chitosan, and shrimp carcass. This preserved nitrogen can serve as a valuable nitrogen source for crop applications. Graphical Abstract
  • How Do NPK-Organomineral Fertilizers Affect the Soil Availability and Uptake of Iron, Manganese, Copper, and Zinc by Maize Cultivated in Red and Yellow Oxisols?
    Everton Geraldo de Morais, Carlos Alberto Silva, Henrique José Guimarães Moreira Maluf, Igor de Oliveira Paiva, Leonardo Henrique Duarte de Paula
    Journal of Soil Science and Plant Nutrition, 2023
  • Effects of Compost-Based Organomineral Fertilizers on the Kinetics of NPK Release and Maize Growth in Contrasting Oxisols
    Everton Geraldo de Morais, Carlos Alberto Silva, Henrique José Guimarães Moreira Maluf, Igor de Oliveira Paiva, Leonardo Henrique Duarte de Paula
    Waste and Biomass Valorization, 2023

RECENT SCHOLAR PUBLICATIONS

  • Biochar and Ammonium Nitrate Synergies: Enhancing Nitrogen Availability and Maize Growth in Oxisols
    IO Paiva, EG Morais, CA Silva
    Agronomy 15 (3), 633 , 2025
    2025
    Citations: 4
  • Biochar N content, pools and aromaticity as affected by feedstock and pyrolysis temperature
    I de Oliveira Paiva, EG de Morais, K Jindo, CA Silva
    Waste and Biomass Valorization 15 (6), 3599-3619 , 2024
    2024
    Citations: 75
  • How Do NPK-Organomineral Fertilizers Affect the Soil Availability and Uptake of Iron, Manganese, Copper, and Zinc by Maize Cultivated in Red and Yellow Oxisols?
    EG de Morais, CA Silva, HJGM Maluf, I de Oliveira Paiva, LHD de Paula
    Journal of Soil Science and Plant Nutrition 23 (4), 6284-6298 , 2023
    2023
    Citations: 11
  • Effects of compost-based organomineral fertilizers on the kinetics of NPK release and maize growth in contrasting oxisols
    EG de Morais, CA Silva, HJGM Maluf, IO Paiva, LHD de Paula
    Waste and Biomass Valorization 14 (7), 2299-2321 , 2023
    2023
    Citations: 23

MOST CITED SCHOLAR PUBLICATIONS

  • Biochar N content, pools and aromaticity as affected by feedstock and pyrolysis temperature
    I de Oliveira Paiva, EG de Morais, K Jindo, CA Silva
    Waste and Biomass Valorization 15 (6), 3599-3619 , 2024
    2024
    Citations: 75
  • Effects of compost-based organomineral fertilizers on the kinetics of NPK release and maize growth in contrasting oxisols
    EG de Morais, CA Silva, HJGM Maluf, IO Paiva, LHD de Paula
    Waste and Biomass Valorization 14 (7), 2299-2321 , 2023
    2023
    Citations: 23
  • How Do NPK-Organomineral Fertilizers Affect the Soil Availability and Uptake of Iron, Manganese, Copper, and Zinc by Maize Cultivated in Red and Yellow Oxisols?
    EG de Morais, CA Silva, HJGM Maluf, I de Oliveira Paiva, LHD de Paula
    Journal of Soil Science and Plant Nutrition 23 (4), 6284-6298 , 2023
    2023
    Citations: 11
  • Biochar and Ammonium Nitrate Synergies: Enhancing Nitrogen Availability and Maize Growth in Oxisols
    IO Paiva, EG Morais, CA Silva
    Agronomy 15 (3), 633 , 2025
    2025
    Citations: 4