Green Sugarcane Research Articles

Simple fabrication of green nanocellulose-reinforced sugarcane (S. officinarum) bagasse film with improved water barrier properties

This study reports a simple fabrication of green sugarcane (Saccharum officinarum) bagasse nanocomposite-based films with improved water barrier properties. In this work, cellulose nanofibers derived from sugarcane bagasse (SB-CNF) were employed as reinforcing agents. The reinforcing effects of varying SB-CNF concentrations, ranging from 10 to 40 wt%, on the characteristics and functionalities of nanocomposite films were measured. Our results demonstrated that the film incorporating 30 % SB-CNF into the SB matrix exhibited optimal characteristics and was chosen for further evaluation of its water barrier properties. To enhance the water barrier properties of the resulting films, different concentrations of lysozyme (0, 3.5, 7, 10.5, and 14 wt%) were incorporated into the film matrix. With the addition of 3.5 % LZ, the film exhibited enhanced water barrier properties, yielding a water contact angle of 97.60 ± 0.79°, a water solubility of 18.64 ± 0.79 %, and a water vapour permeability of 0.65 ± 0.04 g mm/m2 d kPa. The film also showcased its ability to retain water over the course of 120 minutes, with a swelling ratio of 430 %. An increase in mechanical strength (67.28 ± 0.58 MPa) and transparency (88.70 ± 0.39 %) of the film was also noted. The observed findings were attributed to the good dispersion and excellent intermolecular interactions between the lysozyme and the SB/30 %SB-CNF. These results offer a promising prospect for utilization in food packaging applications, with an emphasis on food preservation.

Coupling Coordination of Green Sugarcane Production and Comprehensive Social Development in Chinese Sugar Industry

Coupling Coordination of Green Sugarcane Production and Comprehensive Social Development in Chinese Sugar Industry

Evaluation of the nutritive value of sugar cane tops and its silage at Wondogenet, Sidama, Ethiopia

The study was conducted at Wondogenet Agricultural Research Center to investigate the effect of urea and urea plus molasses treatment on nutritive value of sugarcane tops and its silage. The green sugarcane top that was purchased from the surrounding farmers during the harvesting time was chopped to the favorable size for silage and ensiled with or without 1% molasses, 4% urea and 4% urea + 1% molasses in plastic silos for 21 days. Results revealed that dry matter content of the silage varied between 30.13 % and 41.86%, protein content between 5.33% and 12.49%, ash content between 2.3% and 9.03%, NDF content between 64.84% and 73.1%, ADF content between 39.09% and 41.79%, pH between 4.15 and 4.47, Fleig score between 86.46 and 111.52, digestibility of dry matter between 56.3% and 58.4%, dry matter intake between 1.6% and 1.9%, relative feed value between 74.1 and 83.4, depending on the urea and urea plus molasses treated additives. Sugarcane top ensiled with urea-based additives showed better CP content than the treatments without additive and treated with molasses. Sugarcane top silage of the current study was of bad and/or unacceptable quality in terms of the NDF ratio and good and/or medium in terms of the ADF ratio according to the roughage quality standard for farm animals. In terms of the Fleig score, it was determined that the quality of the sugarcane top silage could be classified as “very good” (Fleig score >85) and the pH value of ≤ 4.53, was within the acceptable range in quality silage. Generally, adding urea and urea plus molasses additives improved nutritional value and utilization of sugarcane top silage.

Study of the Mechanical Properties of Sugar Cane Fiber for Packaging Paper Based on Polyacrylamide and Natural Fibers

Natural fibers have been extensively studied as a reinforcement filler in obtaining composites, replacing partially synthetic fibers. The vast majority of these materials originate from agro-industrial waste with a high content of lignin and cellulose making it a very interesting material with low cost and good mechanical properties. The purpose of the study was to obtain a composite based on alkyl ketene dimer resin, for the manufacture of sustainable packaging, made of paper by adding a 10% (w/w) con-tent of green coconut fiber and sugarcane bagasse fiber, and evaluated the impact of the filler on the mechanical behavior of the systems. The studied material was characterized from mechanical tests, such as Ring Crush Test (RCT) and Concora Medium Test (CMT) evaluating the maximum resistance supported by centimeter in the pre-pared composites, by the specimens. Through the RCT tests, with 10% w/w fibers, it was possible to verify that the fiber from sugarcane bagasse reached an increase of about 1% in the reinforcement effect compared to pure paper, and a difference of up to 2% in strength mechanics in relation to coir fiber, and CMT tests shows the reinforcement effect of the presence of sugarcane bagasse fiber, with an increase of about 3% compared to pure paper, and with a mechanical strength higher by 1% compared to coconut fiber. Therefore, the study was funneled with sugar cane fiber, varying the content by 20 and 30 % (w/w), evaluating the impact on the dispersion of this filler in the polymeric matrix and, consequently, the mechanical response of the composite with these compositions. The conclusion of the study was that the system prepared with 20% (w/w) was the one that achieved the greatest optimization of the mechanical properties, evaluated by the tests. This type of material can be applied to obtain cardboard boxes with resistance to high loads, due to the achievement of good mechanical properties.

Social Life Cycle Assessment of Green and Burnt Manual Sugarcane Harvesting in the Northeastern Thailand

Despite green sugarcane harvesting being promoted in Thailand, with some limitations on the use of harvesting machines, green sugarcane harvesting is practiced manually in many sugarcane fields. Although the environmental benefit seems clear, this harvesting practice’s social implications are yet unknown. This study assessed social performances of green and burnt manual sugarcane harvesting in North-Eastern Thailand, the region hosting the largest sugarcane plantation area, using the Social Life Cycle Assessment technique. Data collection was undertaken by surveys. The performance reference points method was applied to assess the different stakeholder’s social performances. Key stakeholder groups examined were workers, local community, and farm owners. The main social issues included in this study are fair wages, working conditions, health and safety, local employment, economic development, social responsibility, and satisfaction of occupation. The results showed that the social performances of green and burnt sugarcane harvesting were generally similar except for the local community group. This is mainly due to the health impact of sugarcane burning on the local community. Different issues cause the farmers to harvest the burnt sugarcane; for example, labor shortage in the harvesting season and the difficult working conditions for green harvesting, causing the farm owners to bear higher costs. For these reasons, mechanized harvesting is suggested to help promote green harvesting to reduce local air pollution. However, technology development is in urgent need to make the harvesting machines more affordable and applicable to all geographical conditions.

Kadar kemanisan tebu (saccharum officinarum L.) di kampung Wariori Indah distrik Masni kabupaten Manokwari

This study aimed to determine the level of sweetness of sugarcane growing in the village of Wariori Indah. This research was conducted in Wariori Indah village, Masni district, Manokwari regency in August 2020. The method used in this study was a descriptive method with field observation techniques. There were 5 types of sugarcane grown by the people of Wariori Indah Village, namely Red Sugar Cane (Meresa Ekeni), Yellow Green Sugar Cane (Meresa Ofrha), Yellow Sugar Cane (Meresa Oruk), White Striped Red Cane (Meresa Epsi), and Green Stripes Red Cane (Meresa Ofrha). The results of the study found that there were differences in the level of sweetness in the sugarcane plants observed. Yellow green sugarcane has a high level of sweetness (15.2), followed by yellow sugar cane (14.0), and red sugar cane (13.3), while white stripes red cane and green stripes red cane stripes having the same level of sweetness, namely 12.3.

Growth Performance, Nitrogen Balance and Blood Biochemical Parameters on Feeding TMR Diet Containing Sugarcane Tops Silage Supplemented with Lactic Acid Bacteria Inoculants and Exogenous Fibrolytic Enzymes in Crossbred Calves

Background: Preservation of green sugarcane tops (SCT) as silage is still challenging due to its low fermentation coefficient. Present study was undertaken to assess the effect of different combination of additives on nutrient utilisation and growth performance in crossbred (Karan fries) heifers fed SCT silage based total mixed diet.Methods: Sugarcane tops (300 g DM/kg fresh matter) ensiled for 30 days in plastic jumbo silo bags (500 kg capacity) in three different treatments viz. SCTB1, SCTB2 and SCTB3 silages. Total mixed ration (TMR) TMRB1, TMRB2 and TMRB3 were prepared, containing 40 part concentrate and 60 part sugarcane tops SCTB1, SCTB2 and SCTB3 silages, respectively. Eighteen crossbred calves of similar body weights (115 kg) and age (11 months) were divided in three group and offered dietary treatments: TMRB1, TMRB2 and TMRB3 for sixty days. Feed intake (daily) and body weight (weekly) was recorded. Blood samples were collected (monthly) for glucose, creatinine, BUN, plasma calcium, ALT and AST levels estimates. Result: On 30th day SCT silage samples were analysed, pH and NDF content was found lower (p less than 0.05) whereas lactic acid content was higher (p less than 0.05) in SCTB2 and SCTB3 than SCTB1 silage. Feed intake, growth performance, nitrogen balance and blood biochemical parameters were remained similar among the groups. Total tract digestibility of NDF and ADF was found higher (p less than 0.05) in groups TMRB2 and TMRB3 than TMRB1. It may be concluded that LAB and EFE supplementation on SCT silage improved fibre digestibility (NDF and ADF) of TMR diet however, feed intake, growth performance and blood parameters were not affected in crossbred calves.

Urea- Versus Ammonium Nitrate–Based Fertilizers for Green Sugarcane Cultivation

This study tested the hypothesis that enhanced-efficiency fertilizers, such as urea treated with NBPT, are a feasible substitute for ammonium nitrate–based fertilizers for green sugarcane cultivation. The experimental design included six N sources applied over sugarcane straw at two sites in Central-South Brazil. Treatments included ammonium nitrate, urea, and four urea-based fertilizers treated with different rates of the urease inhibitor N-(n-butyl)thiophosphoric triamide (NBPT) at two rates of N (50 and 100 kg ha−1), plus an additional control. Nitrogen status in the plant, the activity of glutamine synthetase (GS) and nitrate reductase (NR) in the leaves, and sugarcane stalk yield and quality were evaluated. At site 1, N rates increased the SPAD index, stalk yield, N uptake, and sugar yield. At site 2, N rates increased GS activity, N content, the SPAD index, and N uptake, but stalk and sugar yield were not increased due to large variability in these parameters. All N sources resulted in similar yields at both sites. These results were compared with those in the literature. Among 27 studies surveyed, the average sugarcane yield was 97.8 or 97.4 Mg ha−1 under ammonium nitrate or urea fertilization, respectively, and these averages did not differ by the Kruskal-Wallis test. The results of this study demonstrate that enhanced-efficiency fertilizers have the potential to reduce NH3 emissions from urea-based fertilizers in green sugarcane fields without affecting sugarcane yield.

Planning migrant labor for green sugarcane harvest: A stochastic logistics model with dynamic yield prediction

The sugarcane harvest often requires migrant workers when there is insufficient supply of domestic workers or harvest machines. The recruitment of migrant workers is a long process, and the decision maker (DM) needs to determine the number of workers before the yield uncertainty is revealed. The prior distribution can be estimated from historical yields. During the sugarcane growing season, the DM can dynamically update the initial estimate of yield distribution. For this purpose, a stochastic logistics model with dynamic yield prediction is formulated. The model determines the flow of migrant workers from sources to sugarcane fronts in order to maximize the total expected contribution, subject to the worker availability constraint at each source. With respected to yield distribution, the expected contribution is defined as the expected revenue from green and burnt cane, minus the cost of labor, the cost of transporting workers from a source to a sugarcane front, and the cost of updating yield distribution. Under certain conditions, the optimization problem becomes convex programming, and a closed-form optimal solution can be obtained. In a general case, three heuristic solutions are proposed, and their performances are evaluated in a numerical example: The optimality gap is less than 0.07 percent in a small example. The proposed method is applied to a case study of sugarcane harvest in 46 provinces in Thailand. The monetary value of the dynamic yield prediction is found to be 1.9 million THB, which can be used to justify the investment in yield prediction and precision agriculture technology to reduce the variability of the agricultural yield.

Multisite response of sugarcane to nitrogen rates and split application under Brazilian field conditions

AbstractBrazil is the world's largest sugarcane (Saccharum spp.) producer, with 8.5 million ha and 643 million t of stalks produced annually. Sugarcane production has a significant impact in the Brazilian economy due to the large production of sugar, ethanol, and energy. The low N use efficiency is a challenge for sugarcane production and may be due to a lack of synchrony between fertilizer application and maximum N demand. This study tested the hypothesis that split N application can improve sugarcane yield by matching fertilizer application and crop demand. We conducted 25 green sugarcane field trials in south‐central Brazil (15 in the first ratoon stage [Year 1] and 10 in the second ratoon stage [Year 2]) divided into three harvest periods: autumn, winter, and spring. We adopted a factorial design at the autumn and winter sites, evaluating N rates and methods of application (total or split), and a complete block design in spring, evaluating N rates. Measurements included stalk yield, total recoverable sugars, and sugar yield. Nitrogen responsiveness was higher in sugarcane harvested in autumn compared with winter or spring. Split N application (i.e., applying half of the N soon after harvest and half at the beginning of the rainy season) showed the potential to increase yields by 3–7 Mg ha−1 in autumn but not in winter. Among the seven responsive sites, the yield gain was 9–10.5 Mg ha−1, and the average yield at 0.8 kg N Mg−1 was statistically similar to those at 1.0, 1.2, and 1.4 kg N Mg−1.

Biofouling in sugarcane juice refining by nanofiltration membrane: Fouling mechanism and cleaning

An integrated membrane process for green sugarcane juice purification is promising but its application is limited by serious membrane fouling, especially biofouling. For the first time, this work investigated the effect of pH, temperature and sugar concentration on the growth of L. mesenteroides subsp. dextranicum, which is a main bacterium consisting in cane juice leading to serious biofouling during decoloration of cane juice by nanofiltration (NF). It was found that acidic pH, lower temperature and sucrose concentration increased bacterial growth, and more dextran was produced at faster bacterial growth, resulting in severer fouling during membrane filtration. Biofouling behavior and enzymatic/chemical cleaning efficiency were compared in dead-end and cross-flow filtrations of synthetic solution or cane juice (in virtue of membrane fouling resistance, permeate flux decline, permeability recovery, surface morphology and chemistry characterizations), showing that dextran was not only the main foulant but also the adhesive among the other foulants as well as between foulants and membrane. Moreover, a compact dextran layer would cover or enwrap other foulants such as protein, pigments, cell debris and bacteria, protecting them from chemical cleaning. Therefore, the dextranase degradation followed by an alkaline cleaning with surfactant was the most effective strategy to remove the biofouling layer and recover the membrane permeability. This work not only elucidated the fouling mechanisms during decoloration of cane juice by NF, but also offered an effective cleaning strategy for biofouling control in the practical application.

Feed and Fodder Availability and Utilization Pattern in Urban-Peri-Urban Dairy Farms in and Around Navsari City of South Gujarat

This investigation was carried out to study the fodder resource management practices followed by selected 40 commercial dairy farmers in and around Navsari city of South Gujarat. The required information was collected through personal interview. Data analyzed revealed that buffalo consisted more than two third of total strength. Population of younger animals like calves and heifers were 33 and 9 % of total herd strength, respectively. The annual green and dry fodder availability calendar showed that 95 % farmers used sugarcane top during November to March. During April to July 100 % respondents fed whole sugarcane, whereas during August to October 34, 15 and 4 farms were using green grass, green sorghum and green maize, respectively. Among dry fodder, paddy straw was popular and used by 37 farms, whereas 10 farms were using sorghum straw. The quantity of fodder used by each farm revealed that sugarcane tops fulfilled average 39.27 % of ration requirement in 38 farms. Similarly, green sugarcane fulfilled average 23 % of ration requirement in all 40 farms. Green cut and carry grass fulfilled 13.15 % of ration in 34 farms. As far as dry fodder was concerned, paddy straw and sorghum straw were used to fulfill 41.49 and 31.70 % of their ration requirement in farms, where it was used. Among concentrates cotton seed cake, wheat bran and compound concentrate (Sumul Dan) were used by 38, 20 and 16 farms, respectively. They were using cotton seed cake at proportion of 33% in their ration. Analysis of demand and supply of feed and fodder resources revealed that all farms studied together required annually 10124, 2248 and 2248 tons of green fodder, dry fodder and concentrate as per thumb rule feeding of dry matter at 3 % of body weight. However, all feed resources were in shortfall by 21-51 %. Annual shortage of dry fodder was the highest, i.e., 51.33 % and shortage of concentrate was the lowest (14.64 %).

Development of sugarcane and trash identification system in sugar production using hyperspectral imaging

Classification and differentiation of clean sugarcane from trash (green sugarcane leaf, dry sugarcane leaf, stone, and soil) are important for the sugar payment system at a sugar mill. Currently, the methods used to do this are manual and subjective. Therefore, this study is aimed at accurately differentiating clean sugarcane from trash by using hyperspectral imaging with multivariate analyses. Samples containing sugarcane billets and trash mixed in a ratio of 18:38 were analyzed in this study. The reflectance data of the samples were analyzed in the wavelength range of 400–1000 nm via principal component analysis (PCA). The PCA model was capable of identifying all of the clean sugarcane and trash samples. The spectral loadings of the PCA model show that the sugarcane and trash samples are easily identifiable based on the color (visible light) of each class, water absorption (approximately 970 nm), and chlorophyll absorption (approximately 680 nm). Based on the characteristic wavelengths of the PCA loading peaks, over 90% of the sugarcane and trash samples were differentiated using a multiple linear regression model. Sugarcane and trash are classified by using partial least-squares discriminant analysis and support vector machine models. For all wavelengths, the classification rate is 92.9% and 98.2%, respectively. This shows that sugarcane and trash can be accurately classified and differentiated by using hyperspectral imaging and multivariate analyses.

Thermal Behavior of Polyester Composites Reinforced with Green Sugarcane Bagasse Fiber

Natural fibers such as those from sugarcane bagasse may be obtained as industrial waste products. These fibers have recently been investigated as low-cost reinforcements in composites for engineering applications, some of which may require exposure to temperatures above ambient. In the present work, fibers extracted from sugarcane bagasse were used at up to 30 vol.% as reinforcement in polyester-matrix composites. The thermal behavior of these composites was investigated by thermogravimetric analysis (TGA) and derivative thermogravimetry (DTG) as well as dynamic mechanical analysis (DMA) and differential scanning calorimetry (DSC). TGA/DTG results indicated similar limits of thermal stability at about 200°C for the neat polyester and the bagasse fiber composites. The thermal degradation peak at around 370°C was also similar, being attributed mainly to polyester. DSC analysis revealed that bagasse fiber incorporation caused only a minor change in the glass-transition temperature. On the contrary, DMA parameters revealed notable changes attributed to effect of the bagasse fibers on the viscous stiffness and damping capacity of the polyester.

Sugarcane residue management impact soil greenhouse gas

ABSTRACT Mechanized sugarcane harvest is replacing the historic practice of field burning, due to environmental concerns of the particulate and emissions during burning. However, the impact of these practices on soil greenhouse gas (GHG) production potential is not fully known. Thus, the present work quantified the potential production, in 1 g of soil, of greenhouse gases (GHG) in three systems of sugarcane management. The systems were: area with a history of burning sugarcane before harvest (B) and another with two systems of management of “green sugarcane” in two periods of implantation - 5 (G-5) and 10 years (G-10). A laboratory incubation experiment was used to assess the production potentials of carbon dioxide (CO2), nitrous oxide (N2O) and methane (CH4) in 1g of soil samples by the different sugarcane management systems. The results of this study demonstrate that the sugarcane management systems had an impact on the potential production of CO2 in the soil. In addition, when the results of gases were divided from convex and concave areas, differences in CO2 patterns between areas B and G-10 were observed, with greater emission in the G-10 area, probably due the residue on the soil surface.

Anthocyanins characterization and antioxidant activities of sugarcane (Saccharum officinarum L.) rind extracts

Anthocyanins in rind extracts of three sugarcane cultivars, ROC 22, Haitang 22 and Guitang 21, were characterized using ultra performance liquid chromatography (UPLC) combined with electrospray ionization quadrupole-time-of-flight tandem mass spectrometry (ESI-QTOF-MS/MS). A total of thirteen anthocyanins were identified and quantified. Except for cyanidin-3-glucoside, twelve anthocyanins were reported for the first time from sugarcane. The total anthocyanin content (TAC) varied significantly from 10.8 (Haitang 22) to 132.0 μg/g dry rind weight (DW) (ROC 22). Regarding single anthocyanins, ROC 22 contained 79.8 μg/g DW cyanidin-3-glucoside but this anthocyanin was not identified in the other two cultivars. Instead, Guitang 21 contained 94.6 μg/g DW malvidin-3-p-coumaroyl-rhamnoside-5-glucoside. The rinds of red sugarcane cultivars ROC 22 and Guitang 21 had higher total antioxidant activities than green sugarcane Haitang 22, which was attributed to much higher contents of free and total phenolics. This study provides useful information for the production of valuable nutraceuticals from sugarcane.

Optimizing urease inhibitor usage to reduce ammonia emission following urea application over crop residues

Abstract Nitrogen loss as ammonia (NH3) is a major problem when urea is topdressed over crop residues. The treatment of urea with N-(n-butyl) thiophosphoric triamide (NBPT) temporarily inhibits urease activity and reduces NH3 volatilization loss under many agro­ecological conditions. However, the amount of straw on the soil in green sugarcane trash blanketing (GCTB) systems affects the success of NBPT in reducing NH3 loss. We hypothesized that an increase in the NBPT concentration in urea above the current level (530 mg NBPT kg−1 urea) in Brazil is necessary to reduce the NH3 volatilization and to improve the efficiency of urea in GCTB systems. We evaluated the NH3 loss from urea treated with NBPT under field conditions in GCTB systems. Six field trials were conducted across the State of Sao Paulo, the main sugarcane-growing region in Brazil. The treatments were urea, ammonium nitrate, urea treated with NBPT at concentrations of 530, 850, 1500, and 2000 mg kg−1, and a control plot without N fertilizer. The amount of volatized NH3 was assessed through a closed semi-static collector containing two acid-trap foam disks, and analyzed by colorimetry using flow injection analysis. NBPT concentrations above 530 mg kg−1 delayed the time of maximum rate of loss and also reduced cumulative NH3 loss. Ammonia emissions were linearly reduced with increasing NBPT concentrations until 1000 mg kg−1. Any further increase in the NBPT concentration did not result in a substantial reduction of NH3 volatilization. Increasing the NBPT concentration in urea is an effective approach to optimize the adoption of urea-based fertilizers in tropical GCTB systems.

The Effect of Reduction Parameter in Processing Lump Ore with Green Sugarcane Bagasse Reductor in Muffle Furnace

Sugarcane bagasse has demonstrated its ability to act as a reductor in iron-reduction process. As a reductor, bagasse has specialties as double-acting reductor equiped with volatile matter. This is the first study of the use of bagasse as reductor in iron-reduction process. The parameter concluded from this study was used for the second study which report has been submitted for publication. The aim of this study is to discuss the effect of reduction process parameter to the use of bagasse as reductor. This study was divided into 2 step. The first step is determining the optimum reduction process temperature and weight ratio. The reduction temperature varied as 700, 800, 900 and 1000 °C and the weight ratio are 1:2 and 1:4. The process duration is 30 minutes. The second stape is determining the process duration. The process duration will be varied as 30, 45 and 60 minutes. The condition of bagasse is air dried basis. The result shows that the reduction process produced wustite (FeO).

Soil management of sugarcane fields affecting CO2 fluxes

The harvesting system of green sugarcane, characterized by mechanized harvesting and no crop burning, affects soil quality by increasing the remaining straw left on the soil surface after harvesting, thus, contributing to the improvement of physical, chemical, and microbiological soil attributes, influencing CO2 fluxes. This study aimed to evaluate CO2 fluxes and their relation to soil properties in sugarcane crops under different harvesting managements: burned (B), Green harvesting for 5 years (G-5) and Green harvesting for ten years (G-10). For this, a 1 ha sampling grid with 30 points was installed in each area, all located in the Northeast of Sao Paulo State, Brazil. In each point, CO2 fluxes were measured and the soil was sampled to analyze the microbial biomass, physical (soil moisture and temperature, mean weight diameter, bulk density, clay, macroporosity and microporosity) and chemical characterization (pH, organic C, base saturation and P). The CO2 fluxes were divided into four quantitative criteria: high, moderate, low and very low from the Statistical Division (mean, first quartile, median and third quartile) and the other data were classified according this criterion. The Principal Component Analysis (PCA) was used to identify the main soil attributes that influence CO2 fluxes. The results showed that G-10 CO2 fluxes were 28 and 41 % higher than those in the G-5 and B treatments, respectively. The PCA analysis showed that macroporosity was the main soil attribute that influenced the high CO2 fluxes.

Liming in the sugarcane burnt system and the green harvest practice affect soil bacterial community in northeastern São Paulo, Brazil.

Here we show that both liming the burnt sugarcane and the green harvest practice alter bacterial community structure, diversity and composition in sugarcane fields in northeastern São Paulo state, Brazil. Terminal restriction fragment length polymorphism fingerprinting and 16S rRNA gene cloning and sequencing were used to analyze changes in soil bacterial communities. The field experiment consisted of sugarcane-cultivated soils under different regimes: green sugarcane (GS), burnt sugarcane (BS), BS in soil amended with lime applied to increase soil pH (BSL), and native forest (NF) as control soil. The bacterial community structures revealed disparate patterns in sugarcane-cultivated soils and forest soil (R=0.786, P=0.002), and overlapping patterns were shown for the bacterial community structure among the different management regimes applied to sugarcane (R=0.194, P=0.002). The numbers of operational taxonomic units (OTUs) found in the libraries were 117, 185, 173 and 166 for NF, BS, BSL and GS, respectively. Sugarcane-cultivated soils revealed higher bacterial diversity than NF soil, with BS soil accounting for a higher richness of unique OTUs (101 unique OTUs) than NF soil (23 unique OTUs). Cluster analysis based on OTUs revealed similar bacterial communities in NF and GS soils, while the bacterial community from BS soil was most distinct from the others. Acidobacteria and Alphaproteobacteria were the most abundant bacterial phyla across the different soils with Acidobacteria Gp1 accounting for a higher abundance in NF and GS soils than burnt sugarcane-cultivated soils (BS and BSL). In turn, Acidobacteria Gp4 abundance was higher in BS soils than in other soils. These differential responses in soil bacterial community structure, diversity and composition can be associated with the agricultural management, mainly liming practices, and harvest methods in the sugarcane-cultivated soils, and they can be detected shortly after harvest.