Several studies have reported a frequent occurrence of platy structures in soils under no tillage (NT), mostly in silty ones. The objective of this study was to evaluate the morphological features and the pore architecture of a soil under NT and their effects on hydro-physical variables. The study was conducted on a Typic Argiudoll in a site located in the Rolling Pampa, NE of the Buenos Aires province, Argentina. The experimental area was a patch 50 m^2, in which rainfall simulation and soil sampling were performed in four sub-plots. Soil structural features were determined by direct visual observation of monoliths and individual aggregates, and by micromorphological and micromorphometric analyses on thin sections. Occurrence of platy structure resulting from cultivation was evident in all sub-plots. A strong vertical anisotropy characterized the topsoil and different morphological types (Platy, Open Platy and Dense) were identified.Rainfall simulations were employed to determine infiltration rate, runoff and sediment yield, which show a high spatial variability. Total porosity, pore size and type and orientation of aggregates and pores appeared to be the main factors explaining the slow infiltration and the great variability of hydrological parameters. The results obtained indicate that a detailed study of structure and porosity of soils cultivated under NT can help to evaluate the effects of this practice on their physical health and behavior.

几项研究报告说，在免耕（NT）的土壤中经常出现板状结构，主要是在粉质土壤中。本研究的目的是评估 NT 下土壤的形态特征和孔隙结构及其对水文物理变量的影响。该研究是在位于阿根廷布宜诺斯艾利斯省内布拉斯加州滚动潘帕的一个地点的典型 Argiudoll 上进行的。试验区为一块 50 m ^{2 的斑块，}其中降雨模拟和土壤采样在四个子地块中进行。土壤结构特征是通过对整体和单个聚集体的直接目视观察，以及对薄片的微观形态学和微观形态学分析来确定的。在所有子地块中都明显出现了由栽培引起的板状结构。强烈的垂直各向异性表征了表土和不同的形态类型（板状、开放板状和致密）。降雨模拟被用来确定入渗率、径流和产沙量，这显示出很高的空间变异性。总孔隙度、孔径以及聚集体和孔隙的类型和方向似乎是解释缓慢下渗和水文参数变化大的主要因素。