Twelve‐year tillage and crop rotation effects on yields and soil chemical properties in northeast Iowa Karlen, Douglas Karlen, Douglas Berry, Elaine Colvin, Thomas Kanwar, Rameshwar Kanwar, Ramesh
dc.contributor.department Agricultural and Biosystems Engineering 2018-02-14T16:17:55.000 2020-06-29T22:41:03Z 2020-06-29T22:41:03Z 2014-09-21 1991
dc.description.abstract <p>Long‐term tillage and crop management studies may be useful for determining crop production practices that are conducive to securing a sustainable agriculture. Objectives of this field study were to evaluate the combined effects of crop rotation and tillage practices on yield and changes in soil chemical properties after 12 years of research on the Clyde‐Kenyon‐Floyd soil association in northeastern Iowa. Continuous corn <em>(Zea mays</em> L.) and a corn‐soybean [<em>Glycine max</em> L. (Herr.)] rotation were grown using moldboard plowing, chisel plowing, ridge‐tillage, or no‐tillage methods. Tillage and crop rotation effects on soil pH, Bray P1, 1M NH<sub>4</sub>OAc exchangeable K, Ca, and Mg, total C, and total N in the top 200 mm were evaluated. Profile NO<sub>3</sub>‐N concentrations were also measured in spring and autumn of 1988. Crop yields and N use efficiencies were used to assess sustainability. Bray P1 levels increased, but exchangeable K decreased for all cropping and tillage methods. Nutrient stratification was evident for no‐tillage and ridge‐tillage methods, while the moldboard plowing treatment had the most uniform soil test levels within the 200 mm management zone. Chisel plowing incorporated fertilizer to a depth of 100 mm. Soil pH was lower with continuous corn than with crop rotation because of greater and more frequent N applications. Profile NO<sub>3</sub>‐N concentrations were significantly different for sampling depth and among tillage methods in spring 1988. In autumn the concentrations were significantly different for sampling depth and for a rotation by tillage interaction. Estimated N use efficiencies were 40 and 50 kg grain per kg N for continuous corn, and 48 and 69 kg grain per kg N for rotated corn in 1988 and 1989, respectively. The results suggest that P fertilizer rates can be reduced, but K rates should probably be increased to maintain soil‐test levels for this soil association. Crop rotation and reduced tillage methods such as ridge‐tillage or chisel plowing appear to meet the criteria for sustainable agriculture on these soils.</p>
dc.description.comments <p>This article is from <em>Communications in Soil Science and Plant Analysis</em> 22 (1991): 1985–2003, doi:<a href="" target="_blank">10.1080/00103629109368552</a>.</p>
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dc.identifier archive/
dc.identifier.articleid 1853
dc.identifier.contextkey 6143263
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath abe_eng_pubs/584
dc.language.iso en
dc.source.bitstream archive/|||Sat Jan 15 01:02:03 UTC 2022
dc.source.uri 10.1080/00103629109368552
dc.subject.disciplines Agriculture
dc.subject.disciplines Bioresource and Agricultural Engineering
dc.subject.disciplines Soil Science
dc.title Twelve‐year tillage and crop rotation effects on yields and soil chemical properties in northeast Iowa
dc.type article
dc.type.genre article
dspace.entity.type Publication
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