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

This Article Abstract Full Text Free Full Text (PDF) Free Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in Web of Science Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Web of Science (2) Citing Articles via Google Scholar Google Scholar Articles by Liebig, M. A. Articles by Varvel, G. E. Search for Related Content PubMed Articles by Liebig, M. A. Articles by Varvel, G. E. Agricola Articles by Liebig, M. A. Articles by Varvel, G. E. Related Collections Ecosystem Management Crop Rotation Systems Maize Agricultural Systems

Effects of Western Corn Belt Cropping Systems on Agroecosystem Functions

^a USDA-ARS, Northern Great Plains Res. Lab., P.O. Box 459, Mandan, ND 58554
^b USDA-ARS, Soil and Water Conserv. Res. Unit, 119 Keim Hall, Dep. of Agron., Univ. of Nebraska, Lincoln, NE 68583-0934

View larger version (20K): [in a new window]   Fig. 1. Performance scores (scaled to 100) from 1983–1990, 1983–1994, and 1983–1998 for four crop sequences organized by N rate. ZERO, LOW, and HIGH N rates represent 0, 90, and 180 kg N ha-1 for corn and grain sorghum and 0, 34, and 68 kg N ha-1 for soybean and oat + clover. CC, continuous corn; C–SB, corn–soybean; C–OCL–SG–SB, corn–oat + clover–sorghum–soybean; C–SB–SG–OCL, corn–soybean–sorghum–oat + clover.