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Temporal Yield Variability under Conventional and Alternative Management Systems

^a Dep. of Land Resources and Environmental Sciences, Montana State Univ., Bozeman, MT 59717
^b Dep. of Crop and Soil Sciences and W. K. Kellogg Biological Station, Michigan State Univ., Hickory Corners, MI 49060. R.G. Smith, current address: USDA-ARS, Exotic and Invasive Weeds Research Unit, 800 Buchanan St., Albany, CA 94710

View larger version (11K): [in this window] [in a new window]   Fig. 1. Average yields of (A) corn, (B) soybean, and (C) winter wheat at the W.K. Kellogg Biological Station Long Term Ecological Research (KBS LTER) from 1993 to 2004. Values are means ±SE, n = 6; except NT, where n = 5. Treatments sharing the same letter are not significantly different at P < 0.05, Tukey HSD. Management systems are CT, conventional; NT, no-till; LI, low-input; and ORG, organic.

View larger version (11K): [in this window] [in a new window]   Fig. 2. Inter-annual yield variability of (A) corn, (B) soybean, and (C) wheat phases of a 3-yr corn–soybean–wheat rotation at the the W.K. Kellogg Biological Station Long Term Ecological Research (KBS LTER) from 1993 to 2004. Values are means ±SE, n = 6; except NT, where n = 5. Treatments sharing the same letter are not significantly different at P < 0.05, Tukey HSD. Management systems are CT, conventional; NT, no-till; LI, low-input; and ORG, organic.

View larger version (24K): [in this window] [in a new window]   Fig. 3. Total annual precipitation at the the W.K. Kellogg Biological Station Long Term Ecological Research (KBS LTER) site from 1993 to 2004. Crops are c, corn; s, soybean; w, wheat.