RESUMOObjetivou-se neste trabalho, comparar a resistência à compressão de tijolos de solo-cimento fabricados com o montículo do cupim Cornitermes cumulans (Kollar, 1832), com tijolos que utilizaram como matéria prima um NEOSSOLO QUARTZARÊNICO (EMBRAPA, 1999), ambos submetidos a duas idades de cura (07 ou 28 dias). O experimento foi montado em delineamento inteiramente casualizado, em esquema fatorial 2x2, sendo analisados dois cofatores: a matéria prima base e a idade de cura. Os ensaios físicos e mecânicos obedeceram às prescrições das normas da Associação Brasileira de Normas Técnicas NBR-8492 (ABNT, 1982) e NBR-8491 (ABNT, 1984). Concluiu-se que a resistência à compressão dos tijolos foi maior com o aumento das idades de cura. O tratamento T4 apresentou maior valor de resistência à compressão, não diferindo estatisticamente dos tratamentos T2 e T1. Os tijolos fabricados com o montículo do cupim C. cumulans (Kollar, 1832) apresentaram diminuição da absorção de água com o aumento das idades de cura, o que normalmente corresponde a um maior aumento da resistência à compressão, ao contrário dos que utilizaram o NEOSSOLO QUARTZARÊNICO (EMBRAPA, 1999).Termos para indexação: Idade de cura, ensaios físicos e mecânicos, solo-cimento. ABSTRACTThe aim of this research was to compare the compressive strength of ground-cement bricks manufactured with the wooded hill of termite Cornitermes cumulans (Kollar, 1832), to bricks that they were used as quartzaremico raw material one NEOSSOLO QUARTZARÊNICO (EMBRAPA, 1999), both submitted to two ages of cure (07 or 28 days). The experiment was performed in entirely randomized delineation, in factorial project 2x2, being analyzed two cofactors: the raw material base and age of cure. The physical and mechanical assays obeyed the lapsing of the norm of the Brazilian Association of Technical Rules NBR-8492 (ABNT, 1982) and NBR-8491 (ABNT, 1984). One concluded that the compressive strength of the bricks was bigger with the increase of the ages of cure. The T4 treatment presented bigger value of compressive strength, not differing statistically from the treatments T2 and T1. The bricks manufactured with the wooded hill of termite C. cumulans (Kollar, 1832) presented reduction of water absorption with the increase of the ages of cure, which normally corresponds to a bigger increase of the compressive strength, on the contrary of the ones that used NEOSSOLO QUARTZARÊNICO (EMBRAPA, 1999). (2003), trata-se de um processo físico-químico de estabilização e reorientação das partículas sólidas do solo com a deposição de substâncias cimentantes nos contatos intergranulares, alterando, portanto, a quantidade relativa de cada uma das três fases (sólida, líquida e gasosa) que constituem o solo.
The spatial variability of soil physical attributes is important to indicate management practices that best suit agricultural areas. This study aimed to analyze spatial correlations between soybean grain yield and soil mass-volume relationships, in order to select which attribute is correlated with yield, as well as to evaluate the spatial variability of soil attributes and yield components of this crop, in an Oxisol under no-tillage system. The soil attributes analyzed (0.0-0.10 m and 0.10-0.20 m) were the following ones: soil bulk density (paraffin-coated clod and volumetric ring methods), particle density (volumetric flask and modified volumetric flask methods) and total porosity. The soybean yield components were evaluated as it follows: grain yield, number of pods per plant, number of grains per pod, mass of 100 grains, grain mass per plant, plant population and plant height. The total soil porosity, calculated by the relations between the bulk density (volumetric ring method) and particle density (volumetric flask), in the 0.10-0.20 m layer, was the best indicator of soybean grain yield under no-tillage conditions.
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