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Tramlines, Row Orientation, and Individual Row Effects on Solid-Seeded Soybean Plot Comparisons

Dep. of Agronomy, 1575 Linden Dr.
Univ. of Wisconsin-Madison, Madison, WI 53706

^* Corresponding author.

Evaluations of solid-seeded soybean [Glycine max (L.) Merr.) and other crops in solid-seeded research plots without damage to plants from equipment can be difficult. This study was conducted to determine how individual rows of solid-seeded soybean plots responded to the additional space of tramlines within the border rows, and if the effects varied with row orientation or cultivar. Cultivars Evans, Hodgson 78, and Hardin were planted in the field in seven 0.18 m harvest rows and two 0.28 m border rows as plots in north-south (N-S) and east-west (E-W) orientations near Arlington, WI from 1983 to 1985. The additional space between harvest and border rows served as tramlines through the plots, and imparted 28% more area to each of the two outside harvest rows than each of the other harvest rows. East-west row orientation had a lodging rating 0.4 units (0 to 5 scale) greater than N-S orientation in 1984, but no yield difference. In 1985 N-S orientation outyielded E-W by 410 kg ha^–1. Final plant stands in the rows next to tramlines averaged 10% less than the five center plot rows, but yields averaged 18% greater in compensation for the tramlines. The second rows from tramlines also yielded higher than three center rows, and contributed an additional 7% average yield. Performance estimates using seven rows between the tramlines were no different than those from the center three rows, which were guarded from the tramlines by two rows on each side. Cultivar yields varied, but relative performance was not influenced by tramlines or row orientations. We conclude that tramlines can be used in a plot planting system for accurately testing cultivars or treatments in solidseeded soybean.

Received for publication April 15, 1988.