Agregação e carbono orgânico de latossolo em função de cultivares de cana-de-açúcar e irrigação por gotejamento subsuperficial.
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Data
2022-05-23
Autores
Magalhães, Yasmin Reis
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Universidade Estadual Paulista (Unesp)
Resumo
A cultura da cana-de-açúcar apresenta diversos sistemas de produção. Dentro desses
sistemas, fatores como a cultivar utilizada, o tipo de solo, a manutenção da palhada e
a irrigação podem levar a diferenças na estruturação do solo. O objetivo do trabalho
foi avaliar e comparar a agregação do solo e o teor de carbono orgânico em áreas
cultivadas com cultivares de cana-de-açúcar submetidas a irrigação por gotejamento
e não irrigadas. O experimento foi realizado em um Latossolo Vermelho eutroférrico
de textura argilosa (582 g kg-1 de argila na camada 0,0-0,10 m e 591 g kg-1 de argila
na camada 0,10-0,20 m de profundidade). Foram coletadas amostras de solo em 20
pontos em quatro áreas de cana-de-açúcar nas camadas 0,00-0,10 m e 0,10-0,20 m.
As áreas corresponderam ao cultivo irrigado e não irrigado das cultivares CTC 4 e
IACSP93-3046. Nessas amostras foram determinados o índice de estabilidade dos
agregados, diâmetro médio ponderado de agregados, carbono orgânico particulado,
carbono orgânico associado aos minerais, carbono orgânico do solo e foram calcula das as classes de agregados. Foi realizada a estatística descritiva dos atributos do
solo e a análise multivariada de componentes principais e de fatores. Os escores ge rados para cada amostra na análise multivariada de fatores foram submetidos à aná lise de variância e as médias comparadas pelo teste de Tukey. A irrigação subsuper ficial promove maior estabilidade dos agregados do solo em áreas cultivadas com
cana-de-açúcar. Cultivares de cana-de-açúcar proporcionam diferenças na agregação
do solo, sendo que a cultivar responsiva à irrigação (IACSP93-3046) promove maior
agregação do solo do que a cultivar não responsiva (CTC 4).
Sugarcane cultivation has several production systems. Within these systems, factors such as the cultivar used, soil type, straw maintenance and irrigation can lead to dif ferences in soil structure. The objective of this study was to evaluate and compare soil aggregation and organic carbon content in areas cultivated with irrigated and rainfed sugarcane cultivars. The experiment was carried out in an Oxisol (582 g kg-1 clay layer 0.00-0.10 m and 591 g kg-1 clay layer 0.10-0.20 m layer). Samples were collected at 20 points in the four sugarcane areas in the 0.00-0.10 m and 0.10-0.20 m layers. The areas corresponded to irrigated and rainfed cultivation of cultivars CTC 4 and IACSP93-3046. In these samples, aggregate stability index, weighted average aggre gate diameter, particulate organic carbon, mineral-associated organic carbon, soil or ganic carbon was determined, and the aggregate classes were calculated. Descriptive statistics of the soil attributes and multivariate analysis of principal components and factors were performed. The scores generated for each sample in the multivariate fac tor analysis were submitted to variance analysis and the means compared by Tukey test. Subsurface irrigation promotes greater aggregates stability in areas cultivated with sugarcane. Sugarcane cultivars provide differences in soil aggregation, with irri gation-responsive cultivar (IACSP93-3046) promoting higher soil aggregation than non-responsive cultivar (CTC 4).
Sugarcane cultivation has several production systems. Within these systems, factors such as the cultivar used, soil type, straw maintenance and irrigation can lead to dif ferences in soil structure. The objective of this study was to evaluate and compare soil aggregation and organic carbon content in areas cultivated with irrigated and rainfed sugarcane cultivars. The experiment was carried out in an Oxisol (582 g kg-1 clay layer 0.00-0.10 m and 591 g kg-1 clay layer 0.10-0.20 m layer). Samples were collected at 20 points in the four sugarcane areas in the 0.00-0.10 m and 0.10-0.20 m layers. The areas corresponded to irrigated and rainfed cultivation of cultivars CTC 4 and IACSP93-3046. In these samples, aggregate stability index, weighted average aggre gate diameter, particulate organic carbon, mineral-associated organic carbon, soil or ganic carbon was determined, and the aggregate classes were calculated. Descriptive statistics of the soil attributes and multivariate analysis of principal components and factors were performed. The scores generated for each sample in the multivariate fac tor analysis were submitted to variance analysis and the means compared by Tukey test. Subsurface irrigation promotes greater aggregates stability in areas cultivated with sugarcane. Sugarcane cultivars provide differences in soil aggregation, with irri gation-responsive cultivar (IACSP93-3046) promoting higher soil aggregation than non-responsive cultivar (CTC 4).
Descrição
Palavras-chave
Agregação do solo, Irrigação, Cana-de-açúcar