Scientific Research Publishing

Read  full paper  at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=53002#.VK9BrsnQrzE Author(s)    Deborah S. Page-Dumroese 1* , Matt D. Busse 2 , Steven T. Overby 3 , Brian D. Gardner 4 , Joanne M. Tirocke 1   Affiliation(s) 1 USDA Forest Service, Rocky Mountain Research Station, Moscow, USA . 2 USDA Forest Service, Pacific Southwest Research Station, Davis, USA . 3 USDA Forest Service, Rocky Mountain Research Station, Flagstaff, USA . 4 USDA Natural Resource Conservation Service, Moscow, USA . ABSTRACT Soil quality assessments are essential for determining impacts on belowground microbial community structure and function. We evaluated the suitability of active carbon (C), a rapid field test, as an indicator of soil biological quality in five paired forest stands (clear cut harvested 40 years prior and unharvested) growing on volcanic ash-cap soils in northern Idaho. Active C was compared with several traditional measur...

Read  full  paper  at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=52914#.VKyajsnQrzE Author(s) Yasser El-Nahhal * , Mohamed Abadsa , Samir Affifi Affiliation(s) Department of Environment and Earth Sciences, The Islamic University, Palestinian National Authority (PNA), Gaza, Palestine . ABSTRACT This study investigated the leaching potential of diuron and linuron in different soil types in Gaza Strip, Palestine under laboratory and field conditions. Leaching potential was evaluated by tin columns and bioassay technique using Molokhia as test plant. The responses of the test plant were regressed versus concentrations of the herbicide to estimate linear regression equation and the regression coefficient. The obtained results indicate strong positive association between Molokhia and concentrations of diuron or linuron; accordingly it was used in the bioassay and estimation of the concentrations of the tested herbicides in the le...