HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Siddoway, F. H. Search for Related Content PubMed Articles by Siddoway, F. H. Agricola Articles by Siddoway, F. H.

Effects of Cropping and Tillage Methods on Dry Aggregate Soil Structure¹

ABSTRACT

Dry aggregate soil structure and relative structural stability were compared for various crop rotations, straw residue placements, and methods of summer fallow tillage under dryland conditions. The proportion of nonerodible aggregates was greater when a straw residue was returned to the soil than when it was burned or partially removed. The increase in aggregation attributed to the residue was higher when the residue was left on the surface than when it was plowed under. The proportion of aggregates > 0.84 mm. in diameter was higher when fallow was initially tilled with the moldboard plow than when it was tilled with a one-way disk or sweep implement. The inclusion of grasses and legumes in rotation with winter wheat and fallow resulted in a lower proportion of nonerodible aggregates than under the more common wheat-fallow rotation.

¹ Contribution from the Soil and Water Conservation Research Division, ARS, USDA, Idaho Agr. Exp. Sta., Moscow, cooperating. Published with the approval of the Director, Idaho Agr. Exp. Sta. as Research Paper No. 558.

² Soil Scientist, USDA, Manhattan, Kans., formerly Soil Scientists, USDA, St. Anthony, Idaho.

Received for publication September 7, 1962. Accepted for publication November 13, 1962.