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

This Article Figures Only 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 (4) Citing Articles via Google Scholar Google Scholar Articles by Jones, B. P. Articles by Anderson-Cook, C. M. Search for Related Content PubMed Articles by Jones, B. P. Articles by Anderson-Cook, C. M. Agricola Articles by Jones, B. P. Articles by Anderson-Cook, C. M. Related Collections Soybean Crop Rotation Systems Production Agriculture

SOYBEAN

Double-Crop Soybean Leaf Area and Yield Responses to Mid-Atlantic Soils and Cropping Systems

^a Dep. of Crop and Soil Sci., The Penn State Univ., Univ. Park, PA 16802
^b Virginia Polytechnic Inst. and State Univ., Tidewater Agric. Res. and Extension Center, 6321 Holland Road, Suffolk, VA 23437
^c Dep. of Crop and Soil Environ. Sci., Virginia Polytechnic Inst. and State Univ., Blacksburg, VA 24061
^d Dep. of Statistics, Virginia Polytechnic Inst. and State Univ., Blacksburg, VA 24061

^* Corresponding author (dholshou{at}vt.edu)

Received for publication May 8, 2002. Double-crop soybean (Glycine max L.) often yields less than full-season soybean, due in part to decreased leaf area development. Information is lacking on the effect of cropping system and plant-available water holding capacity (PAWHC) as affected by soil type on LAI in field-scale environments. The objectives of this research were to (i) determine the effect of three cropping systems and three soil types that vary in PAWHC on double-crop soybean leaf area and yield; and (ii) validate the LAI–yield relationship in a field-scale experiment. Soybean LAI and yield were measured at random geographically located positions during the 1999 to 2001 cropping seasons. During years of early season or little drought stress, LAI and yield were 1.1 to 1.2 units and 480 to 558 kg ha^-1 less on the lowest PAWHC soil compared with the soil with the highest PAWHC. Soybean LAI and yield were reduced 0.4 units and 301 kg ha^-1 when soybean experience early season drought stress and was not rotated. Under conditions of late-season drought stress, LAI and yield of rotated soybean were 1.6 units and 1350 kg ha^-1 less on the lowest PAWHC soil. When soybean was not rotated and under conditions of late-season drought stress, LAI and yield were reduced by 2.9 units and 1770 kg ha^-1 for the soil with the lowest PAWHC, and 1.6 units and 760 kg ha^-1 for the soil with intermediate PAWHC. Soybean LAI was linearly related to yield only on the lowest PAWHC soil where LAI was low.

Abbreviations: DAP, days after planting • GPS, global positioning system • LAI, leaf area index • MG, maturity group • PAWHC, plant available water holding capacity