Abstract:RESUMOEstudos sobre a distribuição espacial das plantas daninhas são importantes no contexto agronômico e ambiental. O objetivo deste trabalho foi descrever a distribuição espacial de plantas daninhas em dois sistemas de manejo de solo. O estudo foi realizado em um Latossolo Vermelho distroférrico, em Campo Mourão, PR, utilizado em sistema de plantio direto (PD) e preparo convencional do solo (PC). Estabeleceu-se uma malha referenciada em coordenadas x e y, totalizando 128 pontos amostrais. Avaliou-se a biomas… Show more
“…Schaffrath et al (2007) estudiando la variabilidad espacial de malas hierbas en diferentes sistemas de manejo del suelo encontraron valores de CV entre 86,05% y 168,85% para la siembra directa y entre 74,73% y 81,72% para el cultivo convencional.…”
Section: Resultados Y Discusiónunclassified
“…De acuerdo con Schaffrath et al (2007) el manejo del suelo interfiere sobre la variabilidad espacial de malas hierbas en suelos cultivados con praderas. Mosquera Losada et al (1999) describen que algunas especies de malas hierbas se mantienen inertes en el sistema agrícola hasta que tienen condiciones favorables para su pleno desarrollo.…”
Section: Correlación Espacial Entre Malas Hierbas Enunclassified
-Keywords: geostatistics, soil and biological attributes, spatial variability, soil management, grassland management.
INTRODUCCIÓNEn los países europeos es una práctica habitual el pastoreo en praderas cultivadas, o también, el uso de praderas para la producción de forraje de diferentes tipos. En este sentido, es necesario comprender la dinámica y la ecología de los agrosistemas de producción, para poder determinar cuáles son las mejores alternativas de manejo para el suelo con relación a la existência de malas hierbas.
“…Schaffrath et al (2007) estudiando la variabilidad espacial de malas hierbas en diferentes sistemas de manejo del suelo encontraron valores de CV entre 86,05% y 168,85% para la siembra directa y entre 74,73% y 81,72% para el cultivo convencional.…”
Section: Resultados Y Discusiónunclassified
“…De acuerdo con Schaffrath et al (2007) el manejo del suelo interfiere sobre la variabilidad espacial de malas hierbas en suelos cultivados con praderas. Mosquera Losada et al (1999) describen que algunas especies de malas hierbas se mantienen inertes en el sistema agrícola hasta que tienen condiciones favorables para su pleno desarrollo.…”
Section: Correlación Espacial Entre Malas Hierbas Enunclassified
-Keywords: geostatistics, soil and biological attributes, spatial variability, soil management, grassland management.
INTRODUCCIÓNEn los países europeos es una práctica habitual el pastoreo en praderas cultivadas, o también, el uso de praderas para la producción de forraje de diferentes tipos. En este sentido, es necesario comprender la dinámica y la ecología de los agrosistemas de producción, para poder determinar cuáles son las mejores alternativas de manejo para el suelo con relación a la existência de malas hierbas.
“…Statistical methods such as: semivariogram, kriging has been used to study the spatial variability of soil attributes, taking into account the understanding of the processes of soilorganism interaction (SCHAFFRATH et al, 2007). VIEIRA (2000) has demonstrated that in nearest locations amongst themselves are more similar than those that are further away.…”
“…Regarding weed occurrence, the systems are also influential, mainly in terms of the higher weed density and biomass in conventional tillage. In no-tillage, the influence is verified in the larger diversity of the infesting community, with lower biomass (Schaffrath et al, 2007). Therefore, weeds behave similarly to crop plants, which tend to have a lower yield in more compacted soils (Freddi et al, 2008).…”
The spatial correlation between soil properties and weeds is relevant in agronomic and environmental terms. The analysis of this correlation is crucial for the interpretation of its meaning, for influencing factors such as dispersal mechanisms, seed production and survival, and the range of influence of soil management techniques. This study aimed to evaluate the spatial correlation between the physical properties of soil and weeds in no-tillage (NT) and conventional tillage (CT) systems. The following physical properties of soil and weeds were analyzed: soil bulk density, macroporosity, microporosity, total porosity, aeration capacity of soil matrix, soil water content at field capacity, weed shoot biomass, weed density, Commelina benghalensis density, and Bidens pilosa density. Generally, the ranges of the spatial correlations were higher in NT than in CT. The cross-variograms showed that many variables have a structure of combined spatial variation and can therefore be mapped from one another by co-kriging. This combined variation also allows inferences about the physical and biological meanings of the study variables. Results also showed that soil management systems influence the spatial dependence structure significantly.Keywords: cross-variogram, co-kriging, physical and biological meanings.
RESUMO: CORRELAÇÃO ESPACIAL ENTRE ATRIBUTOS FÍSICOS DE SOLO E DE PLANTAS ESPONTÂNEAS EM DOIS SISTEMAS DE MANEJOA correlação espacial entre atributos de solo e de plantas espontâneas tem importância agronômica e ambiental. O entendimento dessa correlação é fundamental para a interpretação do seu significado,
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