Influence of Nitrogen Application Timing on Low Density Giant Ragweed (Ambrosia Trifida) Interference in Corn

Autor:	William G. Johnson, Kevin D. Gibson, Thomas T. Bauman, E.J. Ott, R. L. Nielsen
Rok vydání:	2007
Předmět:	Ragweed digestive oral and skin physiology food and beverages Sowing Growing season chemistry.chemical_element Plant Science Biology biology.organism_classification Nitrogen Dry weight Ambrosia trifida Agronomy chemistry Low density Nitrogen accumulation Agronomy and Crop Science
Zdroj:	Weed Technology. 21:763-767
ISSN:	1550-2740 0890-037X
Popis:	Field experiments were conducted to evaluate the influence of three nitrogen fertilizer application timings on corn and giant ragweed dry weight, corn and giant ragweed nitrogen accumulation, and corn grain yield. By the V8 growth stage, corn plants in treatments which included nitrogen at planting accumulated up to 27% more dry weight and 26% more leaf area than corn in sidedress-only treatments that had not yet received any fertilizer nitrogen. Nitrogen fertilizer application timing did not influence early-season giant ragweed dry weight, but did influence N accumulation. Giant ragweed at 0.5 plants/m2 accumulated up to 16 kg N/ha in 40-cm-tall plants by the V8 corn growth stage and up to 104 kg N/ha when allowed to remain in corn until the end of the growing season. At this density of giant ragweed, corn yields were not reduced if removed by the V8 corn growth stage. However, season-long interference reduced corn yields by up to 19% regardless of nitrogen application timing. Early-season giant ragweed ...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::87d3e1d62876074642232687fe0e77f2 https://doi.org/10.1614/wt-06-171.1 Zobrazit plný text záznamu