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

This Article 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 ISI Web of Science Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via ISI Web of Science (1) Citing Articles via Google Scholar Google Scholar Articles by Franzen, D. W. Articles by Zollinger, R. K. Search for Related Content PubMed Articles by Franzen, D. W. Articles by Zollinger, R. K. Agricola Articles by Franzen, D. W. Articles by Zollinger, R. K. Related Collections Weed Management Soybean Plant and Soil Interactions Production Agriculture Soil Fertility and Productivity

Production Paper

Influence of Certain Postemergence Broadleaf Herbicides on Soybean Stressed from Iron Deficiency Chlorosis

^a North Dakota State Univ., Dep. of Soil Sci., Box 5758, Fargo, ND 58105-5758
^b Dep. of Soil and Crop Sci., Texas A&M Univ., 2474 TAMU, College Station, TX 77843-2474
^c North Dakota State Univ., Dep. of Plant Sci., 470H Loftsgard Hall, Fargo, ND 58105

^* Corresponding author (dfranzen{at}ndsuext.nodak.edu)

Received for publication August 15, 2003. Postemergence herbicides are widely used in soybean [Glycine max (L.) Merr.]. Although yield is seldom reduced following herbicide applications to soybean under normal growing conditions, little is known regarding their application when the crop is under stress. Iron deficiency chlorosis (IDC) is a common problem in the Red River Valley of North Dakota and Minnesota. Postemergence herbicide applications are usually made early in the season when IDC is most expressed. The objective of this experiment was to compare the effects of selected postemergence soybean herbicides applied to soybean under stress from IDC. Treatments were applied at 12 locations during a 3-yr study. Stunting and necrosis were evaluated at 14 and 28 d after treatment (DAT), and plots were harvested to determine grain yield. There were treatment differences in stunting at 11 locations 14 DAT and at nine locations 28 DAT. Differences in leaf necrosis were found among treatments at 11 locations 14 DAT and at four locations 28 DAT. Lactofen significantly lowered yield at six locations, and imazamox and imazethapyr lowered yield at three locations. These results suggest that herbicides with harsh contact activity (lactofen) and some acetolactate synthase (ALS) inhibitors (e.g., imazamox, thifensulfuron, and imazethapyr) may have potential for greater injury under these soil and environmental conditions. It may be important to consider herbicide injury effects, in addition to weed spectrum, when selecting herbicides for use on IDC-stressed soybean.

Abbreviations: DAT, days after treatment • EC, electrical conductivity • IDC, iron deficiency chlorosis