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This article in SSSAJ

  1. Vol. 54 No. 1, p. 198-204
     
    Received: May 18, 1989
    Published: Jan, 1990


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doi:10.2136/sssaj1990.03615995005400010031x

Dry Aggregate Size Distribution of Sandy Soils as Influenced by Tillage and Precipitation

  1. T. M. Zobeck  and
  2. T. W. Popham
  1. USDA-ARS, Conservation and Production Systems Research Unit, P.O. Box 909, Big Spring, TX 79721-0909
    Biometrician, USDA-ARS, Southern Plains Area, 1301 N. Western St., Stillwater, OK 74075

Abstract

Abstract

Surface soil dry aggregate size distribution (ASD) has a significant effect on the amount and intensity of wind-induced soil erosion. The ASD of cropland varies through time primarily due to the effects of management and climatic factors. A method of predicting ASD is needed to make accurate estimates of wind erosion. The effects of tillage on ASD are described and models proposed to estimate changes in ASD after precipitation has further modified a sandy soil surface. The ASD and bulk density of the near-surface soil were measured on four west Texas sandy soils immediately after tillage and after up to 130 mm subsequent rainfall. Tillage methods included moldboard plow, lister, chisel, and tandem disk. Results indicated that the four tillage methods tested could be separated into two groups to produce reliable estimates of ASD. Moldboard plowing produced significantly larger aggregates than a tillage-tool group comprised of lister, chisel, and tandem disk. The combined effects of tillage and precipitation after tillage produced significant differences (P < 0.002) in ASD for each soil tested. Regression models to estimate ASD using bulk density in the near-surface soil and cumulative precipitation as independent variables accounted for up to 80% of the variation.

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