Response of Soybeans in Maturity Groups V, VI, VII, and VIII to End-trimming
1976
Boerma, H. R. | Marchant, W. H. | Parker, M. B.
Accurate field plot technique is an important factor in soybean [Glycine max (L.) Merr.], cultivar and strain seed yield evaluation. Information on end effects in seed yield trials of soybeans grown in the southern region of the US is not available. The purposes of the present study were to determine the importance of these effects and the measures required to control them. Three soybean cultivars each in maturity groups V, VI, VII, and VIII were end-trimmed by removing 0.46 m from both ends of the harvest rows of plots at the early vegetative, beginning flowering, physiological maturity, and harvest maturity growth stages. Seed yield was determined on consecutive 0.3-m sections from each end of the harvest rows and a 0.6-m section from the middle of each row. The data indicated that removing 0.76 m from the end of plots at physiological maturity or a later stage should eliminate yield inflations. In other tests 5, 4, 7, and 8 cultivars or strains in maturity groups V through VIII, respectively, were planted on 7 May and 20 June and the seed yield determined by both including and excluding the outermost 0.61 m from both ends of the 6.1-m harvest rows. Significant changes in rank and in differences among genotypes were obtained with and without elimination of end effects. These differences existed both among and within maturity groups. Plant height affected yield inflation more than maturity date.
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