科研之友
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摘要
the study of physical, hydric and chemical attributes of a oxisol under the policultivation system in the amazon region were studied. the soil was described morphologicaly and deformed structure samples were collected for physical and chemical characterization. the analyses of hydraulic properties was made from underformed samples collected in each 0.10 m soil layer up to 1.00 m depth with 5 replicates for the determination of hydraulic conductivity of satured soil (ko) by the falling decreasing head permeameter method and determination of the retention curve (fm(q)), using the tensions of 1, 2 and 4 kpa (porous plate funnels) and 10, 30, 50, 100, 500 and 1500 kpa (porous plate pressure cells). other analysis were made up to 1.50 m depth. the ko values in the layers presented great homogeneity between 2.22 and 3.20 cm day-1, related with the soil density variation and porosity.the hydric retention shows that the soil has the capacity to retain a great quantity of water, even when submitted to high potentials, indicating a low availability to the plants. the retention curves did not present a good adjustment by van genuchten equation, suggesting a bimodal porous distribution.
