Seventy years of different management treatments have produced significant differences in runoff, erosion, and ponded infiltration rate in a winter wheat (Triticum aestivum L.)–summer fallow experiment in OR, USA. We tested the hypothesis that differences in infiltration are due to changes in soil structure related to treatment-induced biological changes. All plots received the same tillage (pl...

A mathematical model has been simulated to describe natural in situ bioremediation of contaminated soil. The model equations consist of a system of three non-linear partial differential equations. Sensitivity analysis conducted by numerically solving them, has demonstrated the effect of initial contaminant concentration on the time and mechanism of remediation. The result of simulation indicate...

Fractal geometry has become a widely accepted descriptive tool for speci"c physical properties of natural soils and fractal scaling has recently been proposed as a model for soil particle size distribution. In this work, the cumulative mass distribution of dry soil aggregates, M(r(R), was estimated and shown to be proportional to R3D, where r is the aggregate size, R is a speci"c measuring scal...

Land use change affects soil aggregate composition and stability, which impacts structure health. To reveal how land impacted aggregates of alpine grassland in a high-altitude watershed, samples from 161 sites including grassland, cropland abandoned were selected to measure analyze the distribution fractions (macro-aggregates, micro-aggregates, silt+clay), stability (mean weight diameter, geome...

1339 Soil Sci. Soc. Am. J. 74:1339–1347 Published online 2 June 2010 doi:10.2136/sssaj2009.0280 Received 29 July 2009. *Corresponding author ([email protected]). © Soil Science Society of America, 5585 Guilford Rd., Madison WI 53711 USA All rights reserved. No part of this periodical may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocop...

Tropical regions have been considered the world's primary agricultural frontier; however, some physico-chemical deficiencies, such as low soil organic matter content, poor soil structure, high erodibility, soil acidity, and aluminum toxicity, have affected their productive capacity. Lime and gypsum are commonly used to improve soil chemical fertility, but no information exists about the long-te...