Resumo O objetivo deste trabalho foi avaliar o efeito de parcelas de erosão com seções transversais da superfície do solo retangular (STR) e triangular (STT) na perda de solo e água e na erodibilidade, em sulcos e entressulcos. O experimento foi conduzido em 1998, em um Argissolo Vermelho-Amarelo distrófico arênico, preparado convencionalmente. As dimensões das parcelas de entressulcos foram de 0,50 m por 0,75 m; nos sulcos com STR, as dimensões foram de 0,20 m por 5,90 m, e nos de STT, de 0,50 m por 5,90 m. Utilizou-se chuva simulada constante de 65 mm h -1 nos entressulcos, durante 90 minutos. Nos sulcos, após pré-umedecimento do solo, foram aplicadas cinco vazões extras crescentes de 0,0002 m 3 s -1 até 0,0010 m 3 s -1 . A desagregação nos entressulcos Di (2,09.10 -4 kg m -2 s -1 nas STR e 3,35.10 -4 kg m -2 s -1 nas STT), a erodibilidade nos entressulcos Ki (1,77.10 6 kg s m -4 nas STR e 2,00.10 6 kg s m -4 nas STT), a erodibilidade em sulcos Kr (0,0110 kg N -1 s -1 nas STR e 0,0074 kg N -1 s -1 na STT) e a tensão crítica de cisalhamento tc (2,61 N m -2 na STR e 2,00 N m -2 na STT) não foram estatisticamente diferentes nos dois formatos de seção transversal, e podem ser determinados usandose qualquer um dos formatos de parcelas em solos de textura superficial arenosa.Termos para indexação: solos arenosos, erosão hídrica, degradação do solo. Interrill and rill erosion as affected by plot configuration on a sandy loam Hapludalf soilAbstract The objective of this study was to compare rill and interrill erodibility and critical shear stress, for two configurations of soil surface: rectangular (RCS) and triangular (TCS) cross-sections. The experiment was done in 1998 on a conventionally tilled Hapludalf with a sandy loam soil surface texture. The interrill plot dimensions were 0.50 by 0.75 m, while for rill, the dimensions were 0.20 by 5.90 m for RCS, and 0.50 by 5.90 m for TCS. Constant simulated rain of 65 mm h -1 was applied on the interrill plots for 90 minutes, whereas for the rills, besides rain to prewet the soil, five extra inflows of 0.0002 m 3 s -1 up to 0.0010 m 3 s -1 were applied. The interrill detachment rate Di (2.09x10 -4 kg m -2 s -1 for RCS and 3.35x10 -4 kg m -2 s -1 for TCS), interrill erodibility Ki (1.77x10 6 kg s m -4 for RCS and 2.00x10 6 kg s m -4 for TCS), rill erodibility Kr (0.0110 kg N -1 s -1 for RCS e 0.0074 kg N -1 s -1 for TCS), and critical shear stress tc (2.61 N m -2 for RCS e 2.00 N m -2 for TCS) were not statistically different for the two cross-sections, and can be determined on any of the plot configuration for sandy loam soils.
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