Agronomic comparison of anhydrous ammonia applied with a high speed-low draft opener and conventional knife injection in corn

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Show simple item record Woli, Krishna P. Fernández, Fabián G. Sawyer, John E. Stamper, Joshua D. Mengel, David B. Barker, Daniel W. Hanna, Mark H. 2014-07-02T19:43:00Z 2014-07-02T19:43:00Z 2014-07-02
dc.description.abstract Anhydrous ammonia (AA) is an important N fertilizer in the U.S., and with large farming operations rapid application is needed. This study evaluated the impact of AA application timing and N rates when applied with a high speed low draft (HSLD) or a conventional till knife (CTKI) on corn (Zea Mays L.) production in no-tillage fields. The study was conducted at sites located in Illinois, Iowa, and Kansas from 2007 to 2009. The experimental design was a split-plot factorial arrangement of application method, timing (fall; spring preplant, SP; and sidedress, SD), and five N rates. Fall AA application was least efficient (mean 55 kg N haˉ¹ higher optimum N and 2% lower grain yield, GY), with SP and SD equivalent. The HSLD was comparable to the CTKI with most applications, except when high N rates (180 and 225 kg N haˉ¹) were applied SP. For these treatments AA injury reduced plant population (PP), early season growth, canopy NDVI, and GY. Seedling injury did not occur with any N rate or timing with the CTKI. Shallow AA placement at high speed with the HSLD can provide a viable alternative to traditional deeper knife injection when conditions are suitable for AA application and positioning avoids corn seedling injury. Anhydrous ammonia application with the HSLD, however, should be avoided where high SP AA rates may be placed directly under future corn rows. en_US
dc.language.iso en_US en_US
dc.relation.uri en_US
dc.rights Permission to archive granted by American Society of Agronomy, May 28, 2014. en_US
dc.subject Anhydrous ammonia en_US
dc.subject Fertilizer en_US
dc.subject High speed low draft en_US
dc.subject Conventional till knife en_US
dc.subject Fertilizer application en_US
dc.title Agronomic comparison of anhydrous ammonia applied with a high speed-low draft opener and conventional knife injection in corn en_US
dc.type Article (author version) en_US 2014 en_US
dc.citation.doi doi:10.2134/agronj13.0441 en_US
dc.citation.epage 892 en_US
dc.citation.issue 3 en_US
dc.citation.jtitle Agronomy Journal en_US
dc.citation.spage 881 en_US
dc.citation.volume 106 en_US
dc.contributor.authoreid dmengel en_US

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