Observations of High Nitrate Concentrations in Forage Bermudagrass during Severe to Exceptional Drought Years  

作　　者：Dennis W. Hancock Uttam K. Saha Jennifer J. Tucker R. Lawton Stewart Jr. Dennis W. Hancock;Uttam K. Saha;Jennifer J. Tucker;R. Lawton Stewart Jr.(Department of Crop and Soil Sciences, University of Georgia, Athens, USA;Feed and Environmental Water Laboratory, University of Georgia, Athens, USA;Department of Animal and Dairy Sciences, University of Georgia, Tifton, USA;Department of Animal and Dairy Sciences, University of Georgia, Athens, USA)

机构地区：[1]Department of Crop and Soil Sciences, University of Georgia, Athens, USA [2]Feed and Environmental Water Laboratory, University of Georgia, Athens, USA [3]Department of Animal and Dairy Sciences, University of Georgia, Tifton, USA [4]Department of Animal and Dairy Sciences, University of Georgia, Athens, USA

出　　处：《American Journal of Plant Sciences》2016年第4期695-701,共7页美国植物学期刊（英文）

摘　　要：With the prediction of climate change-induced increases in drought frequency and severity in the southeastern USA, it is important to better understand the risks that drought may pose to NO₃ accumulation in bermudagrass [Cynodon dactylon (L.) Pers.] forage. This report offers observations of NO₃ concentration in Bermudagrass forage samples submitted to the University of Georgia’s Feed and Environmental Water Lab (FEWL) during the extreme to exceptional drought of 2007, the severe drought of 2008, and the four preceding seasons when drought stress was minimal or absent. The probability (P) of a sample being at high risk for nitrate toxicosis was the greatest for the extreme to exceptional drought of 2007 (P = 0.160), slightly lower in the severe drought year of 2008 (P = 0.105), and the lowest for samples from the 2003-2006 growing seasons (P = 0.082) when drought stress was minimal or absent.With the prediction of climate change-induced increases in drought frequency and severity in the southeastern USA, it is important to better understand the risks that drought may pose to NO₃ accumulation in bermudagrass [Cynodon dactylon (L.) Pers.] forage. This report offers observations of NO₃ concentration in Bermudagrass forage samples submitted to the University of Georgia’s Feed and Environmental Water Lab (FEWL) during the extreme to exceptional drought of 2007, the severe drought of 2008, and the four preceding seasons when drought stress was minimal or absent. The probability (P) of a sample being at high risk for nitrate toxicosis was the greatest for the extreme to exceptional drought of 2007 (P = 0.160), slightly lower in the severe drought year of 2008 (P = 0.105), and the lowest for samples from the 2003-2006 growing seasons (P = 0.082) when drought stress was minimal or absent.

关 键 词：NITRATES DROUGHT BERMUDAGRASS 

分 类 号：S51[农业科学—作物学]