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

Abstract

 

This article in SSSAJ

  1. Vol. 61 No. 5, p. 1418-1422
     
    Received: Sept 11, 1995
    Published: Sept, 1997


    * Corresponding author(s): rbowman@lamar.colostate.edu
 View
 Download
 Alerts
 Permissions
 Share

doi:10.2136/sssaj1997.03615995006100050020x

Crop Rotation and Tillage Effects on Phosphorus Distribution in the Central Great Plains

  1. R. A. Bowman  and
  2. A. D. Halvorson
  1. USDA-ARS, P.O. Box 400, 40335 City Road GG, Akron, CO 80720

Abstract

Abstract

The fate and availability of soil P in the central Great Plains may become less predictable with less tillage and more intensive crop rotations that produce more crop residue and litter than conventional-till (CT) wheat (Triticum aestivum L.)-fallow (W-F). We need to evaluate these new systems relative to new P distribution patterns that may be occurring. We determined P changes in a Weld silt loam soil (fine, montmorillonitic, mesic aridic Paleustoll) in predetermined plots from a 5-year rotation-tillage experiment where 45 kg P ha−1 was applied in 1990, and 18 kg P ha−1 was applied to the wheat phase of the rotation thereafter. We determined changes in water-soluble P, resin-extractable P, total organic P, bicarbonate-extractable P, and phosphomonoesterase activity as a function of tillage and cropping intensity in soil from the 0- to 5-cm and 0- to 15-cm depths. Phosphorus concentration in wheat tops at an early stage was also determined to assess soil P availability. Generally, P availability indices increased significantly in the 0- to 5-cm depth with continuous cropping treatments compared with wheat-fallow treatments. The results suggest that under more intensive cropping systems P recycling through residue and litter could be an important mechanism resulting in additional plant-available P.

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

Copyright © . Soil Science Society of America