| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
a USDA–Natural Resources Conservation Service, 820 Bay Ave., Suite 107, Capitola, CA 95010
b Texas A&M Univ. System, Texas Agric. Exp. Stn., 6500 Amarillo Boulevard West, Amarillo, TX 79106
c USDA-ARS Columbia Plateau Conservation Res. Center, 48037 Tubbs Ranch Rd., Adams, OR 97810
* Corresponding author (Kelli.Camara{at}ca.usda.gov)
Received for publication October 1, 2001. Sustainable cropping systems are essential for agronomic, economic, and environmental reasons. Data from a winter wheat (Triticum aestivum L.)/summer fallow rotation experiment, in eastern Oregon, was used to evaluate long-term effects of tillage, N, soil depth, and precipitation on yield. The soil is a Walla Walla silt loam (coarse-silty, mixed, mesic Typic Haploxeroll). The experiment consisted of three tillage treatments (moldboard plow, offset disk, and subsurface sweep) and six N treatments. Four main time periods (1944–1951, 1952–1961, 1962–1987, 1988–1997), were identified, within which experimental treatments were consistently maintained. Depth to bedrock ranged from 1.2 to 3.0 m. Yield was significantly greater (>300 kg ha-1) for the moldboard plow than for the subsurface sweep in all time periods. Yield was generally greater (>100 kg ha-1) for the moldboard plow than for the offset disk, but only significantly in Time Periods 3 and 4. For Periods 1 and 2, the addition of N fertilizer tended to produce higher yields, regardless of quantity or distribution of rainfall. For Period 3, yield did not increase with the addition of more than 45 kg N ha-1, which we attribute to below-normal precipitation. For Period 4, when precipitation was above average, yield increased with the addition of up to 90 kg N ha-1. Results demonstrated that despite beneficial effects on soil properties, conservation tillage has tended to be less productive for this cropping system than moldboard plowing, probably due to lack of downy brome weed control in the conservation tillage systems.
Abbreviations: N, nitrogen • PNW, Pacific Northwest
This article has been cited by other articles:
|
|
 |
|
  M. Mazzoncini, C. Di Bene, A. Coli, D. Antichi, M. Petri, and E. Bonari Rainfed Wheat and Soybean Productivity in a Long-Term Tillage Experiment in Central Italy Agron. J., September 8, 2008; 100(5): 1418 - 1429. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 F. Zvomuya, H. H. Janzen, F. J. Larney, and B. M. Olson A Long-Term Field Bioassay of Soil Quality Indicators in a Semiarid Environment Soil Sci. Soc. Am. J., May 1, 2008; 72(3): 683 - 692. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
K. Girma, S. L. Holtz, D. B. Arnall, L. M. Fultz, T. L. Hanks, K. D. Lawles, C. J. Mack, K. W. Owen, S. D. Reed, J. Santillano, et al. Weather, Fertilizer, Previous Year Yield, and Fertilizer Levels Affect Ensuing Year Fertilizer Response of Wheat Agron. J., November 6, 2007; 99(6): 1607 - 1614. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 A. S. Lithourgidis, K. V. Dhima, C. A. Damalas, I. B. Vasilakoglou, and I. G. Eleftherohorinos Tillage Effects on Wheat Emergence and Yield at Varying Seeding Rates, and on Labor and Fuel Consumption Crop Sci., March 27, 2006; 46(3): 1187 - 1192. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
R. E. Blackshaw Nitrogen Fertilizer, Manure, and Compost Effects on Weed Growth and Competition with Spring Wheat Agron. J., November 17, 2005; 97(6): 1612 - 1621. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
T. Fan, B. A. Stewart, W. A. Payne, W. Yong, J. Luo, and Y. Gao Long-Term Fertilizer and Water Availability Effects on Cereal Yield and Soil Chemical Properties in Northwest China Soil Sci. Soc. Am. J., May 6, 2005; 69(3): 842 - 855. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
K. W. Kelley and D. W. Sweeney Tillage and Urea Ammonium Nitrate Fertilizer Rate and Placement Affects Winter Wheat following Grain Sorghum and Soybean Agron. J., April 27, 2005; 97(3): 690 - 697. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
P. J. Wiatrak, D. L. Wright, and J. J. Marois Influence of Residual Nitrogen and Tillage on White Lupin Agron. J., November 1, 2004; 96(6): 1765 - 1770. [Abstract] [Full Text] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
| The SCI Journals | Crop Science | Vadose Zone Journal | |||
| Journal of Natural Resources and Life Sciences Education |
Soil Science Society of America Journal | ||||
| Journal of Plant Registrations | Journal of Environmental Quality |
The Plant Genome | |||
