Atributos microbiológicos de um latossolo sob cultivo de cana-de-açúcar com e sem queima da palhada

Paredes, Francisco Pereira; Portilho, Irzo Isaac Rosa; Mercante, Fábio Martins

doi:10.5433/1679-0359.2015v36n1p151

Cited by 12 publications

(10 citation statements)

References 9 publications

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“…In agreement with these findings, Paredes Junior et al . () observed similar or higher microbial activity in areas where straw was maintained on the soil. These results indicate that straw mulching creates an improved environment for soil biological communities and serves as food for microbial and soil invertebrate communities.…”

Section: Impacts Of Straw Removal On Soil Biological Attributesmentioning

confidence: 80%

Agronomic and environmental implications of sugarcane straw removal: a major review

et al. 2016

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Large‐scale bioenergy demand has triggered new approaches to straw management in Brazilian sugarcane fields. With the progressive shift from a burned to a nonburned harvest system, most of the straw presently retained on the soil surface has become economically viable feedstock for bioenergy production. The trade‐offs between the need to preserve soil quality and produce more bioenergy have been the subject of intense discussion. This study presents a synthesis of available information on the magnitude of the main impacts of straw removal from sugarcane fields for bioenergy production and therefore represents an easily available resource to guide management decisions on the recommended amount of straw to be maintained on the field to take advantage of the agronomic, environmental, and industrial benefits. Crop residues remaining on sugarcane fields provide numerous ecosystem services including nutrient recycling, soil biodiversity, water storage, carbon accumulation, control of soil erosion, and weed infestation. Furthermore, several studies reported higher sugarcane production under straw retention on the field, while few suggest that straw may jeopardize biomass production in cold regions and under some specific soil conditions. Pest control is among the parameters favored by straw removal, while N2O emissions are increased only if straw is associated with the application of N fertilizer and vinasse. An appropriate recommendation, which is clearly site specific, should be based on a minimum mass of straw on the field to provide those benefits. Overall, this review indicates that most of the agronomic and environmental benefits are achieved when at least 7 Mg ha−1 of dry straw is maintained on the soil surface. However, modeling efforts are of paramount importance to assess the magnitude and rates of straw removal considering the several indicators involved in this complex equation, so that an accurate straw recovery rate could be provided to producers and industry toward greater sustainability.

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Section: Impacts Of Straw Removal On Soil Biological Attributesmentioning

confidence: 80%

Agronomic and environmental implications of sugarcane straw removal: a major review

et al. 2016

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“…The maintenance of soil covered with straw under RT is likely to enhance nutrient and water availability for microbial and plant growth, which led to higher MBC content [47,49]. Some studies reported the increase of MBC as a function of sugarcane straw retention in the field [11,56] and under RT after cover crop [57]. It could be inferred that more labile C fraction derived of longstanding residues was biologically available to microbial respiration, which provided increasing MBC and β-glucosidase activity, thus increasing soil quality under these treatments [15,58].…”

Section: Effects Of Tillage and Straw Removal On Soc Stocksmentioning

confidence: 99%

Can reduced tillage sustain sugarcane yield and soil carbon if straw is removed?

et al. 2019

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Straw removal for bioelectricity, cellulosic ethanol, or other bio-products has become a common practice in Brazilian sugarcane areas, but long-term effects on soil organic carbon (SOC) and yield are unknown. Our objective was to quantify tillage intensity and removal levels on SOC stocks and sugarcane yield on contrasting edaphoclimatic conditions in Brazil. Conventional tillage-CT and reduced tillage-RT coupled with three straw removal levels (none-NR; moderate-MR; total-TR) were combined to create six treatment combinations: CTNR, CTMR, CTTR, RTNR, RTMR, and RTTR, respectively. Sugarcane yield was measured annually and soil samples to a depth of 40 cm were collected and analyzed before and after 5 years of treatments. Neither tillage practices nor straw removal significantly affected sugarcane yield on sandy loam soil, but CTMR, CTTR, and RTTR showed substantial yield reductions on clayey soil. SOC stocks for RTNR increased by as much as 1.64 Mg ha −1 year −1 on clayey soil, while CTMR and CTTR favored depletion of SOC stocks on both soils. Overall, each Mg of straw returned to the soil increased SOC stock by 95 kg ha −1 for clayey soil under both tillage practices and 55 kg ha −1 for sandy loam under the CT system. Furthermore, straw removal decreased microbial biomass C and b-glucosidase activity. These findings suggest that the adoption of RT attenuates the adverse impacts of straw removal on SOC stocks while ensuring sugarcane yields for a more sustainable bioenergy production in Brazil.

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“…In general, both treatments that retained straw (i.e., straw cover, raked) enhanced N and P concentrations in the plant tissue both early and late in the second ratoon. Increased plant nutrient concentrations may reflect the benefits of retaining straw, such as enhanced nutrient cycling (Sousa Jr. et al, 2018) and/or increased C accumulation (Galdos et al, 2017;Cherubin et al, 2018;Sousa Jr. et al, 2018), water storage and infiltration (Valim et al, 2016;Anjos et al, 2017), and biological activity (Paredes Jr. et al, 2015). Healthy soils generally have increased availability of N and P for plant uptake, which subsequently increases plant tissue concentrations of these elements when straw is retained.…”

Section: Second Ratoon Plant Nutrient Statusmentioning

confidence: 99%

Sugarcane Straw Blanket Management Effects on Plant Growth, Development, and Yield in Southeastern Brazil

et al. 2019

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In Brazilian sugarcane (Saccharum spp.) production systems, the practice of moving harvesting residue from row to inter‐row positions (i.e., raking) has increased in response to producer concerns over the potential negative effects of sugarcane straw on crop establishment and stalk yield. Despite increasing adoption among sugarcane farmers, the impacts of straw raking practices on plant growth and yield remain unclear. A 2‐yr experiment that included both dry and wet seasons was conducted at two sites in southeastern Brazil to evaluate straw management strategy effects on plant tillering, phytomass accumulation, plant nutritional status, and stalk yield. The experiments were established at the Bom Retiro mill and the Univalem mill. Experimental treatments included raking straw to inter‐rows (raked), total straw removal (bare soil), and no straw removal (straw cover). Raked and bare soil treatments improved plant tillering but did not influence final plant population. Straw management had a slight effect on phytomass accumulation. Reduction of phytomass yield was observed from the first to the second ratoon during both seasons at both sites. At Bom Retiro, phytomass yield decreased 37% for stands established during the dry season and 19% for stands established during the wet season. At Univalem, phytomass yield decreased 20% for stands established during the dry season and 30% for stands established during the wet season. Retaining straw in the field (regardless of treatment) increased leaf tissue P content but not stalk yield. Raking straw from row to inter‐row positions at these locations in southeastern Brazil had no benefit on sugarcane yield but may result in soil compaction and higher production costs over time.

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Atributos microbiológicos de um latossolo sob cultivo de cana-de-açúcar com e sem queima da palhada

Cited by 12 publications

References 9 publications

Agronomic and environmental implications of sugarcane straw removal: a major review

Agronomic and environmental implications of sugarcane straw removal: a major review

Can reduced tillage sustain sugarcane yield and soil carbon if straw is removed?

Sugarcane Straw Blanket Management Effects on Plant Growth, Development, and Yield in Southeastern Brazil

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