My Account: Log In | Join | Renew
Search
Author
Title
Vol.
Issue
Year
1st Page

Abstract

 

This article in SSSAJ

  1. Vol. 50 No. 6, p. 1566-1570
     
    Received: Mar 10, 1986
    Published: Nov, 1986


 View
 Download
 Alerts
 Permissions
 Share

doi:10.2136/sssaj1986.03615995005000060036x

Effect of Gypsum and Deep-rooting Perennials on Subsoil Mechanical Impedance1

  1. D. E. Radcliffe,
  2. R. L. Clark and
  3. M. E. Sumner2

Abstract

Abstract

Subsoil root growth in highly weathered southeastern soils is limited because of poor chemical conditions and high soil strength. Surface-applied gypsum can leach into the subsoil and amend the chemical properties of these soils. The objective of this study was to determine if gypsum also had a physical effect. Mechanical impedance was measured using a tractor-mounted penetrometer that gave values of cone index (CI) in gypsum-treated and nontreated plots of several ongoing experiments. Cone index was lower in the gypsum-treated plots where alfalfa (Medicago sativa L.) or peach trees [Prunus persica (L.) Batsch] had grown for several years, but there was no reduction in CI in fallow plots treated with gypsum. Samples from the alfalfa plots treated with gypsum had larger stable soil aggregates than samples taken from nontreated plots. We conclude that gypsum amendment increases subsoil root activity, which in turn reduces subsoil mechanical impedance.

  Please view the pdf by using the Full Text (PDF) link under 'View' to the left.

Copyright © . Soil Science Society of America