Agronomy Journal Journal of Natural Resources and Life Sciences Education
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Analysis of Seedbeds and Maturity Groups for Dryland Soybean on Clayey Soil

Michael P. Popp*,a, Terry C. Keislingb, Lawrence R. Oliverc, Carl R. Dillond and Patrick M. Manninga

a Dep. of Agric. Econ. and Agribusiness, 220 Agric. Building, Univ. of Arkansas, Fayetteville, AR 72701
b Dep. of Crop, Soil, and Environ. Sci., Univ. of Arkansas, Northeast Res. and Ext. Cent., P.O. Box 48, Keiser, AR 72351
c Dep. of Crop, Soil, and Environ. Sci., 276 Altheimer Drive, Univ. of Arkansas, Fayetteville, AR 72701
d Dep. of Agric. Econ., 403 Agric. Eng. Building, no. 2, Univ. of Kentucky, Lexington, KY 40546-0276



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  		Fig. 1. Comparison of cumulative probability density functions of no-till and stale seedbed preparation methods using net returns above total specified cost (NRAT) across all maturity groups (MGs) for each planting method at Rohwer, AR, 1992–1994. Cumulative probability density functions were plotted using the fractile method espoused by Schlaifer (1959).

 


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  		Fig. 2. Comparison of cumulative probability density functions of net returns above total specified costs (NRAT) for maturity group (MG) IV, V, and VI for (A) stale and (B) no-till seedbed preparation methods at Keiser, AR, 1990–1997. Cumulative probability density functions were plotted using the fractile method espoused by Schlaifer (1959).

 




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Environmental Quality		 The Plant Genome
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