科研之友
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摘要
Because of increased seed costs for soybean [Glycine max (L.) Merr.], minimizing plant population to a level that still optimizes yield (minimal optimal plant population) has become important. Because little is known about possible genotypic strategies addressing this problem, the objectives of this study were to (i) determine the relative accuracy of three putative selection criteria for genotypic differences in minimal optimal plant population and (ii) use the best criterion to identify cultivar differences within the southern U.S. public cultivar germplasm collection. Two studies to address these objectives were conducted near Baton Rouge, LA (30 degrees N lat). The first study (in 2007 to 2008) involved eight cultivars grown at normal (198,000 plants ha(-1)) and sparse plant populations (10,000 plants ha(-1)). Cultivar potential for a low minimal optimal plant population was assessed by relative yield (%) in sparse vs. normal plant population. Normalized branch dry matter (BDM) per plant (BDM per days to R5) was the most accurate selection criterion for minimal optimal plant population. This criterion was then used in a second study to assess minimal optimal plant population differences among 41 cultivars. Wide differences in normalized BDM per plant occurred, ranging from 0.10 to 1.50 g per plant d(-1). In conclusion, normalized BDM per plant is an accurate and efficient selection measure for minimal optimal plant population.
- 出版日期2013-5
