by Staff Writers
Madison, WI (SPX) Aug 16, 2011
Recent studies report that corn hybrids released in the late 2000s, especially Bt hybrids, require higher seeding rates than commercial hybrids released in the 1990s to reach maximum yields. Expectedly, corn seeding rates in the USA have increased significantly in the past 10 years. However, limited data is available on silage yield and quality responses of recently released hybrids to seeding rates.
Cornell scientist William Cox investigated the response of eight hybrids (three Bt and a non-Bt hybrid, two brown midrib and two silage specific Bt hybrids) to four seeding rates (25,000, 30,000, 35,000, and 40,000 kernels/acre). The study was conducted in 2008 and 2009 on a silt loam soil in New York.
To determine if different hybrid types require different seeding rates for maximum yield and quality, Cox measured leaf area, biomass accumulation, silage yield and silage quality.
All hybrids responded similarly in growth, yield, and quality to seeding rates. Every hybrid had their highest crop growth rates at the 40,000 kernel/acre seeding rate during vegetative development.
However, from the silking stage in late July to the early September harvest, the hybrids had similar growth rates each of the four seeding rates. This indicates that the seeding rates should not be increased for Bt hybrids or decreased for midrib hybrids.
Cox, who conducted the study, said that "results from this study should be applicable for corn silage production on silt loam soils in most northern regions of the USA.
We did not experience any real drought or heat stress in either year of the study, however, so results should not be extrapolated to droughty soils or regions where temperatures are much higher than those encountered in the this study".
The complete results of the study were published in the July-August 2011 issue of Agronomy Journal, presented extensively to New York dairy producers at winter workshops, and recently shared with Canadian scientists at the 2011 Plant Canada Meetings in Halifax, Nova Scotia.
The full article is available for no charge for 30 days following the date of this summary.
Comment on this article via your Facebook, Yahoo, AOL, Hotmail login.
Urban Impacts on Phosphorus in Streams
Madison, WI (SPX) Aug 16, 2011
Although phosphorus is an essential nutrient for all life forms, essential amounts of the chemical element can cause water quality problems in rivers, lakes, and coastal zones. High concentrations of phosphorus in aquatic ecosystems are often associated with human activities in the surrounding area, such as agriculture and urban development. However, relationships between specific human so ... read more
|The content herein, unless otherwise known to be public domain, are Copyright 1995-2011 - Space Media Network. AFP and UPI Wire Stories are copyright Agence France-Presse and United Press International. ESA Portal Reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement,agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement|