Relações entre assinatura magnética do solo e recomendações de calagem, gessagem e fosfatagem corretiva para cana-de-açúcar
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Data
2019-08-01
Autores
Siansi, Frederico Luiz
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Universidade Estadual Paulista (Unesp)
Resumo
O sucesso da produtividade da cana–de–açúcar requer adequadas recomendações para a correção e adubação do solo. A acidez do solo deixa indisponíveis inúmeros nutrientes essenciais à planta, enquanto a adubação inadequada retarda a longevidade do canavial. Desse modo, objetivou-se, neste estudo, verificar o potencial da suscetibilidade magnética do solo para auxiliar nas recomendações e no mapeamento de áreas específicas de manejo para as aplicações de calagem, gessagem e fosfatagem corretiva do solo. Foram coletadas 89 amostras de solo em uma área de 443 hectares, nas quais foram determinados os atributos químicos, os teores de argila e a suscetibilidade magnética do solo. Foram calculadas as recomendações de calagem, gessagem e fosfatagem para cada amostra. Os dados foram submetidos à análise estatística e aos componentes principais. Foram desenvolvidas, nos pontos estratificados, funções de pedotransferência utilizando modelos de regressão entre a suscetibilidade magnética do solo e os atributos estudados. A modelagem da dependência espacial foi feita com o uso da geoestatística e construídos os mapas de krigagem e variogramas cruzados para observar a correlação espacial entre a suscetibilidade magnética do solo e os atributos estudados. A suscetibilidade magnética do solo acompanhou, em mesmo sentido, o grupo discriminado pela fosfatagem e pela gessagem e apresentou correlação espacial linear negativa com a recomendação de calagem (R= -0,84), e positiva com gessagem (R=0,88) e fosfatagem (R=0,93). Desta forma, a suscetibilidade magnética teve potencial para auxiliar nas recomendações de calagem, gessagem e fosfatagem, bem como na elaboração de mapas de áreas específicas para o manejo destas práticas
The success of sugarcane productivity requires adequate recommendations for soil correction and fertilization. The acidity of the soil leaves many essential plant nutrients unavailable, while undesirable fertilizer doses delays the longevity of the sugarcane field. Thus, the objective of this study was to verify the potential of the magnetic susceptibility of the soil to aid in the recommendations and mapping of specific management areas for liming, gypsum, and corrective soil phosphate applications. Eighty nine soil samples were collected in an area of 443 hectares, on which soil chemical properties, clay content, and magnetic susceptibility of the soil were determined. Recommendations for agricultural liming, gypsum, and corrective soil phosphating were calculated for each sample. Data were subject to descriptive statistical analysis, and main components. Pedotransfer functions were developed at the stratified points using regression models between the magnetic susceptibility of the soil and the attributes studied. The spatial dependence modeling was done with the use of Geostatistics, and the Kriging maps and cross variograms were constructed to observe the spatial correlation between the magnetic susceptibility of the soil and the attributes studied. The magnetic susceptibility of the soil followed in the same direction the group discriminated by the gypsum and corrective soil phosphating and presented negative linear spatial correlation with the liming recommendation (R= -0,84), and positive spatial correlation with the recommendation for agricultural gypsum (R=0,88), and corrective phosphating (R=0,93). Therefore, the magnetic susceptibility of the soil had the potential to help in the recommendations of liming, gypsum, and phosphating, as well as in the elaboration of maps of specific areas for the management of these practices
The success of sugarcane productivity requires adequate recommendations for soil correction and fertilization. The acidity of the soil leaves many essential plant nutrients unavailable, while undesirable fertilizer doses delays the longevity of the sugarcane field. Thus, the objective of this study was to verify the potential of the magnetic susceptibility of the soil to aid in the recommendations and mapping of specific management areas for liming, gypsum, and corrective soil phosphate applications. Eighty nine soil samples were collected in an area of 443 hectares, on which soil chemical properties, clay content, and magnetic susceptibility of the soil were determined. Recommendations for agricultural liming, gypsum, and corrective soil phosphating were calculated for each sample. Data were subject to descriptive statistical analysis, and main components. Pedotransfer functions were developed at the stratified points using regression models between the magnetic susceptibility of the soil and the attributes studied. The spatial dependence modeling was done with the use of Geostatistics, and the Kriging maps and cross variograms were constructed to observe the spatial correlation between the magnetic susceptibility of the soil and the attributes studied. The magnetic susceptibility of the soil followed in the same direction the group discriminated by the gypsum and corrective soil phosphating and presented negative linear spatial correlation with the liming recommendation (R= -0,84), and positive spatial correlation with the recommendation for agricultural gypsum (R=0,88), and corrective phosphating (R=0,93). Therefore, the magnetic susceptibility of the soil had the potential to help in the recommendations of liming, gypsum, and phosphating, as well as in the elaboration of maps of specific areas for the management of these practices
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Palavras-chave
Geoestatística, Zonas de manejo específico, Pedometria, Geostatistics, Specific soil management, Pedometrics