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 HighWire Citing Articles via ISI Web of Science (22) Citing Articles via Google Scholar Google Scholar Articles by Ball, R. A. Articles by Vories, E. D. Search for Related Content PubMed Articles by Ball, R. A. Articles by Vories, E. D. Agricola Articles by Ball, R. A. Articles by Vories, E. D.

CROP ECOLOGY, PRODUCTION & MANAGEMENT

Short-Season Soybean Yield Compensation in Response to Population and Water Regime

^a Univ. of Saskatchewan, Dep. of Plant Sciences, 51 Campus Drive, Saskatoon, SK S7N 5A8, Canada
^b Univ. of Arkansas, Dep. of Crop, Soil, and Environmental Sciences, 276 Altheimer Drive, Fayetteville, AR 72704 USA
^c Univ. of Arkansas, Dep. of Biological and Agricultural Engineering, Northeast Research and Extension Center, P.O. Box 48, Keiser, AR 72351 USA

lpurcell{at}comp.uark.edu

Short-season soybean [Glycine max (L) Merr.] production systems, such as double cropping and late sowing, require high populations to optimize yield, but effects of high populations on seed number and seed mass are unknown. We evaluated plant population effects on yield compensation, stability of harvest index, assimilate partitioning for seed number, and seed-filling characteristics for 2 yr near Keiser, AR. The study had two cultivars, two levels of irrigation, and three row spacings that each had five levels of population ranging from 6 to 134 plants m^-2. Increasing population reduced yield per plant but increased yield per unit area. Harvest index was relatively constant across populations for a given year and irrigation regime, and yield was closely associated with biomass at maturity. At high populations, plants maintained individual seed mass by reducing the proportion of shell mass per pod. Final individual seed mass, seed growth rate (SGR), and the length of effective filling period did not change with increasing population for irrigated or nonirrigated treatments. Reductions in yield caused by low population density were due to low seed number. Seed number per square meter was directly proportional to the ratio of crop growth rate (CGR) to SGR. For short-season production, high populations ensured early canopy coverage and maximized light interception, CGR, and crop biomass, resulting in increased seed number and yield potential.

Abbreviations: BM, biomass • CGR, crop growth rate • EFP, effective filling period • , partitioning coefficient • HI, harvest index • PGR, plant growth rate • S1, seed Position 1 • S2, seed Position 2 • S3, seed Position 3 • SGR, seed growth rate

This article has been cited by other articles:

				J. V. Wiersma Iron Acquisition of Three Soybean Varieties Grown at Five Seeding Densities and Five Rates of Fe-EDDHA Agron. J., June 5, 2007; 99(4): 1018 - 1028. [Abstract] [Full Text] [PDF]

				P. S. Poag, M. Popp, J. Rupe, B. Dixon, C. Rothrock, and C. Boger Economic Evaluation of Soybean Fungicide Seed Treatments Agron. J., November 17, 2005; 97(6): 1647 - 1657. [Abstract] [Full Text] [PDF]

				J. J. Heitholt, J. B. Farr, and R. Eason Planting Configuration x Cultivar Effects on Soybean Production in Low-Yield Environments Crop Sci., August 1, 2005; 45(5): 1800 - 1808. [Abstract] [Full Text] [PDF]

				J. K. Norsworthy and E. R. Shipe Effect of Row Spacing and Soybean Genotype on Mainstem and Branch Yield Agron. J., May 13, 2005; 97(3): 919 - 923. [Abstract] [Full Text] [PDF]

				B. S. Sharratt and R. W. Gesch Water Use and Root Length Density of Cuphea spp. Influenced by Row Spacing and Sowing Date Agron. J., September 1, 2004; 96(5): 1475 - 1480. [Abstract] [Full Text] [PDF]

				R. J. Kratochvil, J. T. Pearce, and M. R. Harrison Jr. Row-Spacing and Seeding Rate Effects on Glyphosate-Resistant Soybean for Mid-Atlantic Production Systems Agron. J., July 1, 2004; 96(4): 1029 - 1038. [Abstract] [Full Text] [PDF]

				S. V. Angadi, H. W. Cutforth, B. G. McConkey, and Y. Gan Yield Adjustment by Canola Grown at Different Plant Populations under Semiarid Conditions Crop Sci., July 1, 2003; 43(4): 1358 - 1366. [Abstract] [Full Text] [PDF]

				J. E. Board, M. S. Kang, and M. L. Bodrero Yield Components as Indirect Selection Criteria for Late-Planted Soybean Cultivars Agron. J., March 1, 2003; 95(2): 420 - 429. [Abstract] [Full Text] [PDF]

				B. P. Jones, D. L. Holshouser, M. M. Alley, J. K.F. Roygard, and C. M. Anderson-Cook Double-Crop Soybean Leaf Area and Yield Responses to Mid-Atlantic Soils and Cropping Systems Agron. J., March 1, 2003; 95(2): 436 - 445. [Abstract] [Full Text] [PDF]

				D. L. Holshouser and J. P. Whittaker Plant Population and Row-Spacing Effects on Early Soybean Production Systems in the Mid-Atlantic USA Agron. J., May 1, 2002; 94(3): 603 - 611. [Abstract] [Full Text] [PDF]

				L. C. Purcell, R. A. Ball, J. D. Reaper III, and E. D. Vories Radiation Use Efficiency and Biomass Production in Soybean at Different Plant Population Densities Crop Sci., January 1, 2002; 42(1): 172 - 177. [Abstract] [Full Text] [PDF]

				R. A. Ball, R. W. McNew, E. D. Vories, T. C. Keisling, and L. C. Purcell Path Analyses of Population Density Effects on Short-Season Soybean Yield Agron. J., January 1, 2001; 93(1): 187 - 195. [Abstract] [Full Text]