Open-access Carbon storage in irrigated and rainfed sugarcane production systems with vinasse application

ABSTRACT

Improper soil management for the development of important crops worldwide can jeopardize carbon (C) storage and soil organic matter (SOM) health. It was postulated that the application of vinasse to sugarcane soil under the control of agricultural machinery could increase C stocks and improve aggregate stability index, soil porosity and density, thus ensuring better root penetration. Therefore, in this study, the management system of sugarcane based on rainfed with vinasse application (RV), irrigated (I) and irrigated with vinasse application (IV) was studied in a tropical environment to determine the C stocks and the physical and chemical properties of the soil. The experimental design was randomized blocks with five replicates, and the organic C contents and stocks, soil density, total porosity, soil resistance to root penetration, and aggregate stability index (ASI) of sugarcane within rows and between rows were analyzed at 0–10- and 10–20- cm depth. The RV and IV treatments promoted the same potassium concentrations in the row and between the rows of sugarcane cultivation. The IV exhibited the highest soil ASI (74% at 0–10- and 77% at 10–20-cm depth) and stored approximately 70% more carbon than the I management. The use of sugarcane vinasse preserved the physical conditions of the soil, particularly in the inter-row area, by reducing surface layer compaction and increasing soil moisture and porosity, thereby representing a more sustainable long-term management system.

Key words
soil compaction; soil organic matter; fertigation; crop machinery

INTRODUCTION

Agricultural production systems are responsible for the emission of greenhouse gas and soil carbon depletion (Severiano et al. 2021), exacerbating climate change and resulting in global biodiversity loss (Price 2024). Conservation agricultural management based on no-till, minimum tillage, or organic and fertilized farming, when properly used, can preserve the physical structure of aggregates, store carbon (C), and reduce carbon dioxide (CO2) without damaging the crop yield (Lal 2018, Silva et al. 2018).

Carbon depletion has a negative effect on the economic and environmental balance (Lal 2018). Tillage practices make soils more susceptible to degradation processes that disrupt aggregates and expose their labile organic C content to microbial decomposition, thereby increasing CO2 emissions and reducing nutrient cycling and organic matter (OM) quality (Loke et al. 2019). Furthermore, the use of agricultural machinery in crop production promotes soil compaction, which reduces porosity and negatively affects water infiltration (Loke et al. 2019). All these conditions lead to soil erosion and considerable loss of agricultural potential.

To minimize negative impacts on the climate and soil health and to comply with the 2030 agenda based on sustainable development goals (Lal et al. 2021), farmers have promoted management systems by using organic fertilizers of residual origin, such as vinasse, in crops with high economic potential, such as sugarcane (Júnnyor et al. 2019, Shukla et al. 2020). However, the impact on soil C dynamics under controlled traffic, with agricultural machinery moving only between rows throughout the crop cycle, needs to be evaluated in the irrigated or rainfed management system (Esteban et al. 2020).

Sugarcane is the second most economically important crop in Brazil, accounting for more than 40% of total world production (CONAB 2024). The northeastern region is the third largest producer in the country. The sugarcane production chain generates waste, such as vinasse, and it is estimated that approximately 15 L are generated to produce 1L of ethanol (Del Gobbo et al. 2019). The use of this residue as a fertilizer and soil conditioner provides plants with high levels of potassium, calcium, and magnesium (De Melo et al. 2018). However, its use must be controlled according to the technical recommendations for crop fertilization, as excessive applications can lead to an increased risk of salinization, changes in soil pH, and leaching of nutrients and/or contaminants into water bodies (Da Silva et al. 2021, Stephen et al. 2024).

It was postulated that the application of vinasse to sugarcane soils under the control of agricultural machinery could increase C stocks and improve the aggregate stability index (ASI), soil porosity (TP), and soil density (SD), thus ensuring better root penetration. The objectives of this study were to quantify the C stocks and investigate the relationship between these stocks and the physical and chemical characteristics of sugarcane soils cultivated under irrigated and rainfed conditions, and the application of vinasse under controlled machine traffic. The results will provide access to the possibilities of sustainable sugarcane management in a region of northeastern Brazil with full sugar and alcohol potential.

MATERIALS AND METHODS

The study was conducted in a sugarcane farm of Miriri Bioenergia e Alimentos S/A, situated in the municipality of Santa Rita, state of Paraíba, in the northeastern region of Brazil (Fig. 1). The region is dominated by a humid tropical forest under the Atlantic Forest biome (Jacomine et al. 1972). The climate is As-tropical humid with a dry period in summer according to Köppen-Geiger (Alvares et al. 2013). The average annual rainfall is 1,600 mm, and the average temperature is 26°C (Souza et al. 2007). The management was selected in as soil class (Yellow Argisol), according to the Brazilian Soil Classification System (Santos et al. 2018), and Ultisol (IUSS Working Group WRB 2015), with a sandy texture, under similar conditions of controlled traffic of agricultural machinery, mechanized harvesting, and in the phenological phase of the crop (fourth leaf) (Table 1).

Figure 1
Geographic location of the study site in the northeastern region of Brazil.
Table 1
Sugarcane management in the northeastern Region of Brazil.

Soil sampling was done in the planting within rows and between rows at 0–10- and 10–20-cm depths for each management system, with five replications. The distance between each sampling point was 5 m, with all samples in the same sugarcane row and the adjacent row. Samples were collected with a Dutch-type auger and stored in plastic bags. They were then transported to the laboratory for chemical and physical analysis. For soil density, undisturbed bulk soil was collected with an Uhland-type auger and volumetric rings (height = 50 mm; diameter 50 mm).

The soil samples were air-dried, crushed, and sieved at 2 mm. Particle size fractions were determined using the densimeter method (Gee and Or 2002), modified and described by Almeida (2012). Soil bulk density (BD) and total porosity (TP) were determined based on Teixeira et al. (2017). Soil penetration resistance was determined using a bench electronic penetrometer (MA – 933) in samples with soil moisture equivalent to 60 hPa matrix suction. The percentage of ASI was estimated based on mean weight-diameter (MWD) wet (w) and dry (d) (Teixeira et al. 2017) (Table 2).

Table 2
Granulometric characterization of the soil of sugarcane crops in the northeastern region of Brazil*.

The pH was measured in water (1:2.5). The exchangeable cations Ca2+, Mg2+, and Al3+ were extracted by KCl 1 mol·L-1 and measured by atomic absorption spectrophotometry (Ca2+ and Mg2+) and titration (Al3+). Na+ and K+ cations were extracted with Mehlich-1 solution and quantified by flame photometry (Teixeira et al. 2017). The extraction of H + Al was performed with Ca acetate buffered at pH 7 and quantified by volumetric analysis with a NaOH solution in the presence of phenolphthalein as an indicator. Organic carbon was determined by oxidation with K dichromate (Teixeira et al. 2017) (Table 3). Soil C stocks were calculated and adjusted according to the equivalent soil layer (Sisti et al. 2004) and presented as Eq. 1:

 Soil C stock   ton  ha 1 = TOC g kg 1 × BD g cm 3 ×  Depth  ( cm ) (1)

where: TOC: total organic carbon; BD: bulk density.

Table 3
Chemical characterization of the soil of sugarcane crops in the northeastern region of Brazil.

The Shapiro-Wilk’s test (p ≤ 0.05) was performed to test the normality of the data. Comparisons in and between administrations were performed using analysis of variance (ANOVA). When ANOVA showed significance (p ≤ 0.05), means were compared using the Scott-Knott’s test (p ≤ 0.05). Comparisons between treatments were carried out independently, comparing all rows and between rows separately for each layer analyzed. The data were analyzed using version 5.6 of Sisvar (Ferreira 2019).

RESULTS AND DISCUSSION

Treatments RV and IV exhibited the highest K concentrations in the row and between rows of sugarcane at both depths evaluated in comparison to treatment I. Potassium is the main chemical component of vinasse and is essential to increase sugarcane productivity in various environments (Elgharbawy 2021). Potassium helps maintain cellular osmotic pressure, which allows for efficient uptake of water and nutrients. It also acts as a cofactor in numerous enzymes involved in photosynthesis and cellular respiration, increasing the efficiency of glucose production and sucrose accumulation (Jaiswal et al. 2021). Adequate fertilization of vinasse in irrigated systems contributes to K availability at depth, triggering resistance and more robust root development that maximizes soil exploration (Bhatt et al. 2024).

The soil sodium concentration showed a significant difference between treatments with and without vinasse application, regardless the irrigation use, with the highest Na+ concentrations of 70 and 67 cmolc·kg-1 found in treatments RV and IV, respectively (Stephen et al. 2024). The elements K+, Ca2+, Mg2+, and Na+ generally show positive correlations with vinasse application, consequently providing an increase in the soil fertility levels (high base saturation) (Fuess et al. 2021). However, the excessive use of vinasse may cause an increased risk of soil salinization and/or sodification, mainly depending on the chemical composition of the applied residue (Fuess et al. 2017). The highest values of TOC were found in the RV and IV treatments, while the lowest values were found at 0–10-cm depth (9.1 g·kg-1) in treatment I. Between the rows of sugarcane soils, treatment IV presented 15.3 g·Kg-1 of TOC at 10-cm depth. Conversely, treatment I presented the lowest values (9.4 g·Kg-1). In the 20-cm layer, there was a decrease in the C content of ± 0.5 g·kg-1 (Table 4).

Table 4
Average total organic carbon content (TOC) and predictive attributes of the soil of sugarcane crops in the northeastern region of Brazil*.

The controlled traffic of agricultural machinery preserved the planting lines during all cultural treatments and harvesting because the entire load exerted by the weight of the harvesting machine was applied to the rows between the treatments (Da Luz et al. 2023). This may increase the rate of aggregate decomposition in the upper soil layer due to reduced root distribution. It is known that sugarcane has 70% of the root dry mass to a depth of 0.40 m, in which there is a greater impact of compaction from agricultural machinery traffic (Lovera et al. 2021).

Anthropogenic activities are the main causes of the significant increase in soil density, as they compromise entire aggregate sizes due to the breakdown of the physical structure, thus leading to carbon decomposition and consequent high COsions (Six et al. 2002). It is imperative to avoid the use of agricultural implements such as harrows, plows, scarifiers, and subsoilers in conventional soil management systems to ensure the physical occlusion in which particulate organic C is stored associated with minerals, therefore enhancing C storage at depth (Six et al. 2004, Song et al. 2019).

Several studies reported the ability of vinasse fertigation plots to present higher soil organic carbon (SOC) contents, since an increase in OM content was found due to the P, Ca, and N present in the vinasse composition, which favors the mineralizing activities of soil microorganisms (Nunes et al. 2023). This condition can be observed in sugarcane management under irrigation or rainfed. Therefore, it can be stated that the application of vinasse according to the fertilization recommendations (Carpanez et al. 2022) promotes an increase in the availability of nutrients in the soil due to the improvement in the stabilization of soil aggregates (Da Silva et al. 2021, Del Pino et al. 2022).

Recent studies have shown that the presence and development of sugarcane roots contribute significantly to soil structure by promoting the formation of more stable aggregates (Lovera et al. 2021, Lopes Sobrinho et al. 2024). This stability is essential for improving water infiltration and soil C storage, aspects that are critical in sustainable agricultural practices. When irrigation management is optimized, as in the case of the irrigation treatments studied here, sugarcane roots help create a microenvironment that favors microbial activity, which promotes the mineralization of OM and, consequently, increases soil C storage (Ramalakshmi et al. 2023). Thus, adequate irrigation not only supports healthy root growth but also ensures that soil moisture remains at levels that maximize soil aggregation, allowing for better root development.

The RV and IV treatments showed similar C stocks (21.7 Mg·ha-1 at 0–10-cm and 20.09 Mg·ha-1 at 10–20-cm depth). The lowest values were found in irrigated management (I treatment) without vinasse application (14.1 Mg·ha-1 and 11.4 M·ha-1 at 0–10- and 10–20-cm depth, respectively) (p ≤ 0.05). Between rows, only treatment IV showed higher C stocks at 0–10 cm compared to the sugarcane row (25.8 Mg·ha-1) (p ≤ 0.05) (Fig. 2).

Figure 2
Average carbon stocks in sugarcane management in the northeastern region of Brazil.

These C stocks are according to the global average annual range proposed for tropical environments of 0.41 ± 0.03 Mg·ha-1·year-1 in the 0–20-cm soil depth layer (Chien and Krumins 2022). Tropical agricultural systems featuring sugarcane cultivation, especially those employing irrigation methods combined with vinasse application, controlled traffic of agricultural machinery, and maintenance of OM through straw, have demonstrated significant potential to enhance C stocks (Pinheiro Junior et al. 2024). This C storage capacity is not only important for soil fertility but also for reducing C emissions to the atmosphere. Furthermore, increases in soil C stocks are closely linked to improvements in soil structure, which enhances water infiltration and resistance to erosion, thereby facilitating nutrient cycling between soil and plant (Button et al. 2022).

The results indicated that, even with controlled traffic, there was no significant reduction in C stocks between cultivated areas. However, when comparing the rows between each management separately, a significant difference was found between the areas with vinasse application and those without. It is therefore considered that the application of vinasse ensures the preservation of the physical attributes of the soil between the rows through less compaction and greater moisture retention and porosity, thus confirming that this management system has provided greater protection in the surface layer of the soil.

The application of vinasse promoted high correlations (r > 0.8) between the variable TOC and the evaluated physical attributes (Fig. 3a). However, this correlation (r < 0.8) was not observed without the application of vinasse (Fig. 3b). Regarding the application of vinasse, a negative correlation occurred between total organic carbon, soil density, and soil penetration resistance. Additionally, TOC was positively correlated with TP (0.85) and ASI (0.88). SD was negatively correlated with the quantified physical attributes, except for soil penetration resistance (0.75), as well as porosity with ASI (0.75).

Figure 3
Pearson correlation matrix of the soil physical attributes in a sugarcane plantation under different management systems: (a) with the application of vinasse and (b) without vinasse.

Considering the application of vinasse, TOC demonstrated potential as an indicator of soil quality compared to other physical attributes. TOC is often associated with soil quality parameters, such as structure, water conservation, and water movement in the soil (Page et al. 2020, Voltr et al. 2021). Increases in organic carbon concentrations can also benefit the soil, such as greater water storage capacity and lower soil resistance to root penetration, directly reflecting on crop productivity (Castioni et al. 2019, Jimenez et al. 2021).

CONCLUSION

The C storage capacity of the irrigated and vinasse management systems is characterized by the following descending order: RV > IV > I. It is imperative to obtain long-term assessments to certify the C storage potential in soils under sugarcane planting systems in a tropical environment.

In addition, vinasse application increases soil moisture retention by enhancing the water-holding capacity of the soil. The OM in vinasse contributes to the aggregate stability in soils, which not only improves porosity but also enhances water infiltration. Increased soil porosity allows for better drainage and aeration, reducing the risk of waterlogging and promoting a healthier root environment.

In general, vinasse improves the physical-chemical conditions of the soil and reduces costs for farmers, especially in regions where sugar cane cultivation is emerging.

ACKNOWLEDGMENTS

The authors are grateful to Miriri Alimentos e Bioenergia S/A, for providing the collection areas and for all support during the collection period. We are also grateful to Dr. Pedro Henrique Neves de Souza (agronomist engineer from the Miriri Alimentos e Bioenergia S/A) and Prof. Emidio Cantídio de Oliveira, for providing helpful suggestion about the management systems.

  • How to cite: Nunes, J. A., Fracetto, F. J. C., Leal, L. Y. C., Nunes, C. C. C. G., Paulino, M. K. S. S. and Souza, E. R. (2025). Carbon storage in irrigated and rainfed sugarcane production systems with vinasse application. Bragantia, 84, e20240249. https://doi.org/10.1590/1678-4499.20240249
  • FUNDING
    Conselho Nacional de Desenvolvimento Científico e Tecnológico
    Grant No.: 305136/2021-6
    Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
    Finance code 001
    Fundação Agrisus
    Grant No.: 3107/21
    Fundação de Amparo à Ciência e Tecnologia do Estado de Pernambuco
    Grant No: IBPG-1984-5.01/21

DATA AVAILABILITY STATEMENT

The datasets generated during and/or analyzed are available from the corresponding author upon reasonable request.

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Edited by

Publication Dates

  • Publication in this collection
    03 Mar 2025
  • Date of issue
    2025

History

  • Received
    13 June 2024
  • Accepted
    27 Jan 2025
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