State-space approach for the analysis of soil water content and temperature in a sugarcane crop

Neto, Durval Dourado; Timm, Luís Carlos; Oliveira, J. C. M.; Reichardt, Klaus; Bacchi, Osny Oliveira Santos; Tominaga, Tânia Toyomi; Cássaro, Fábio Augusto Meira

doi:10.1590/s0103-90161999000500025

Cited by 58 publications

(27 citation statements)

References 9 publications

(14 reference statements)

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“…Outros benefícios do sistema de colheita sem queima consistem em: melhoria nos atributos físicos do solo (Dourado-Neto et al, 1999), maior crescimento e ciclagem de raízes (Alvarez et al, 2000), maior infiltração de água no solo (Graham et al, 2002), redução da densidade do solo (Tominaga et al, 2002), menores custos de renovação do canavial, reciclagem e liberação gradual de nutrientes pela decomposição da palha, menores perdas de nutrientes e diminuição da emissão de gases e fuligem (Canellas et al, 2003).…”

Section: Introductionunclassified

Emissões de gases de efeito estufa pela deposição de palha de cana-de-açúcar sobre o solo

2014

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ResumoBiocombustíveis contribuem para reduzir as emissões de gases de efeito estufa (GEE). No Brasil, o principal biocombustível é o etanol de cana-de-açúcar. Além dos colmos, as folhas de cana-de-açúcar também podem ser usadas para produzir etanol. O objetivo deste trabalho foi avaliar as emissões de GEE (CO 2 , CH 4 e N 2 O) induzidas pela presença de palha sobre o solo. Três experimentos foram conduzidos em Latossolos, em Piracicaba: imediatamente após a colheita, aos seis e aos 12 meses após a colheita. Foram avaliados os efeitos de três doses de palha (0%, 50% e 100% da quantidade disponível na superfície) sobre as emissões. Imediatamente após a colheita, as emissões de CO 2 e CH 4 aumentaram com o aumento da quantidade de palha. Aos seis meses após a colheita houve consumo de CH 4 à medida que a quantidade de palha aumentou. Doze meses após a colheita, as emissões dos três gases foram similares, independentemente da quantidade de palha. Remover a palha de cana-de-açúcar não aumenta as emissões de GEE do solo em comparação ao manejo sem retirada da palha da superfície. Contudo, estudos adicionais são necessários para investigar os efeitos sobre a produtividade de cana-de-açúcar, sobre a erosão e sobre outros atributos do solo.Palavras-chave: dióxido de carbono, metano, óxido nitroso, etanol de segunda geração, resíduo vegetal. Greenhouse gases emissions due to sugarcane trash on the soil AbstractBiofuels are important to reduce greenhouse gases (GHGs) emissions to atmosphere. In Brazil, the main biofuel is ethanol from sugarcane. Beyond stalk, sugarcane sheets are also stating to be used to produce second generation ethanol. The objective of this work was evaluate soil GHGs (CO 2 , CH 4 and N 2 O) emissions induced by sugarcane trash on soil surface. Three experiments were done in an Oxisol, in Piracicaba region, taking in account three periods: immediately after sugarcane harvest, six and twelve months after harvest. In each experiment, we evaluated the effects of three sugarcane trash rates (0%, 50% and 100% of the quantity available at soil surface). Immediately after harvest, CO 2 and CH 4 emissions increased linearly with trash rate on soil surface. Six months after harvest there were CH 4 consumption by soil as trash on surface increased. Twelve months after harvest, emissions of the three gases were similar in all trash rates. Removing sugarcane straw from soil surface do not increase soil GHGs emissions as compared to the current management, in which 100% of trash is maintained on the soil surface. However, other studies are needed to investigate its effects under sugarcane yield, soil erosion and under other soil attributes.

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Section: Introductionunclassified

Emissões de gases de efeito estufa pela deposição de palha de cana-de-açúcar sobre o solo

2014

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“…Keeping sugarcane straw on soil surface shows several positive effects to the soil, such as: more nutrient cycling , higher water-holding capacity (Dourado- Neto et al, 1999), higher aggregate stability (Graham et al, 2002), increase of the SOC stocks (Galdos et al, 2009), reduction of the greenhouse gas emissions (Galdos et al, 2010) and increase of sugarcane yield (Gava et al, 2001). However, despite the several benefi ts of maintaining sugarcane residues over the soil, sugarcane producers have considered to partly remove these residues for electricity and second generation ethanol production.…”

Section: Introductionmentioning

confidence: 99%

Input of sugarcane post-harvest residues into the soil

Carvalho

Otto

Franco

et al. 2013

Sci. agric. (Piracicaba, Braz.)

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Sugarcane (Saccharum spp.) crops provide carbon (C) for soil through straw and root system decomposition. Recently, however, sugarcane producers are considering straw to be removed for electricity or second generation ethanol production. To elucidate the role of straw and root system on the carbon supply into the soil, the biomass inputs from sugarcane straw (tops and dry leaves) and from root system (rhizomes and roots) were quantifi ed, and its contribution to provide C to the soil was estimated. Three trials were carried out in the State of Sao Paulo, Brazil, from 2006 to 2009. All sites were cultivated with the variety SP81 3250 under the green sugarcane harvest. Yearly, post-harvest sugarcane residues (tops, dry leaves, roots and rhizomes) were sampled; weighted and dried for the dry mass (DM) production to be estimated. On average, DM root system production was 4.6 Mg ha -1 year -1 (1.5 Mg C ha -1 year -1) and 11.5 Mg ha -1 year -1 (5.1 Mg C ha -1 year -1 ) of straw. In plant cane, 35 % of the total sugarcane DM was allocated into the root system, declining to 20 % in the third ratoon. The estimate of potential allocation of sugarcane residues to soil organic C was 1.1 t ha -1 year -1 ; out of which 33 % was from root system and 67 % from straw. The participation of root system should be higher if soil layer is evaluated, a deeper soil layer, if root exudates are accounted and if the period of higher production of roots is considered.

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“…In contrast, these newly applied methods in the field of soil science take advantage of spatial dependence by making use of the characteristics of each observation location. Statistical tools like autocorrelation function, semivariograms, and state-space, have been used recently to define the structure of spatial distributions of soil properties (Wendroth et al, 1992;Katul et al, 1993;Wendroth et al, 1997;Hui et al, 1998;Dourado-Neto et al, 1999;Timm et al, 2000Timm et al, , 2003a. According to Bresler et al (1981), research during the last two decades has focused the study of soil spatial variability on an improved understanding of processes that influence crop production variability.…”

Section: Introductionmentioning

confidence: 99%

State-space approach to evaluate the relation between soil physical and chemical properties

Timm

Reichardt

Oliveira

et al. 2004

Rev. Bras. Ciênc. Solo

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SUMMARYThe state-space approach is used to evaluate the relation between soil physical and chemical properties in an area cultivated with sugarcane. The experiment was carried out on a Rhodic Kandiudalf in Piracicaba, State of São Paulo, Brazil. Sugarcane was planted on an area of 0.21 ha i.e., in 15 rows 100 m long, spaced 1.4 m. Soil water content, soil organic matter, clay content and aggregate stability were sampled along a transect of 84 points, meter by meter. The state-space approach is used to evaluate how the soil water content is affected by itself and by soil organic matter, clay content, and aggregate stability of neighboring locations, in different combinations, aiming to contribute to a better understanding of the relation among these variables in the soil. Results show that soil water contents were successfully estimated by this approach. Best performances were found when the estimate of soil water content at locations i was related to soil water content, clay content and aggregate stability at locations i-1. Results also indicate that this state-space model using all series describes the soil water content better than any equivalent multiple regression equation.Index terms: spatial variability, sugarcane crop, kalman filter, auto-regressive model. RESUMO: ABORDAGEM DE ESPAÇO DE ESTADOS PARA AVALIAR A RELAÇÃO ENTRE PROPRIEDADES QUÍMICAS E FÍSICAS DO SOLO

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State-space approach for the analysis of soil water content and temperature in a sugarcane crop

Cited by 58 publications

References 9 publications

Emissões de gases de efeito estufa pela deposição de palha de cana-de-açúcar sobre o solo

Emissões de gases de efeito estufa pela deposição de palha de cana-de-açúcar sobre o solo

Input of sugarcane post-harvest residues into the soil

State-space approach to evaluate the relation between soil physical and chemical properties

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