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MODELING

A Regression Model to Predict Soybean Cultivar Yield Performance at Late Planting Dates

Dep. of Agron., Louisiana Agric. Exp. Stn., LSU Agric. Cent., Baton Rouge, LA 70803

* Corresponding author (jboard{at}agctr.lsu.edu)

Received for publication May 31, 2001. Proper cultivar selection increases yield for late-planted soybean [Glycine max (L.) Merr.] in soybean–wheat (Triticum aestivum L.) double-cropping systems in the southeastern USA. In cases where identification of high-yielding cultivars for late planting is not practical by traditional combine-harvest of large plots (e.g., a cultivar trial with many entries or progeny selection from a breeding program), regression models using simple characteristics obtained from small plots are a possible alternative. The objective of this study was to validate two regression models determined from previous research for their accuracy at identifying high-yielding cultivars in independent studies. Field studies were conducted near Baton Rouge, LA (30° N lat.), on a Commerce silt loam (fine-silty, mixed, nonacid, thermic Aeric Fluvaquents) involving a late-planted cultivar study with 46 entries, 1994 to 1996, and a second study, 1995 to 1996, involving 19 cultivars grown under stressed (undrained waterlogged site) and nonstressed conditions (drained site, free of waterlogging). Results indicated that a regression model based on total dry matter at R5, plant height, and length of the seed-filling period (SFP) consistently identified high-yielding cultivars across the two studies (70–100% accuracy) and was also highly correlated with plot yield . The second model, involving only plant height and length of the SFP, was less accurate. In conclusion, regression models using easily obtainable morphological and/or developmental characteristics can be used to identify high-yielding cultivars at late planting dates.

Abbreviations: MG, maturity group • SFP, seed-filling period • TDM(R5), total dry matter at R5

This article has been cited by other articles:

				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]