Search Results - (Author, Cooperation:R. S. Oliveira)

Showing 1 - 2 results of 2, query time: 0.10s Refine Results
  1. 1
    Staff View
    Publication Date:
    2015-11-26
    Publisher:
    Nature Publishing Group (NPG)
    Print ISSN:
    0028-0836
    Electronic ISSN:
    1476-4687
    Topics:
    Biology
    Chemistry and Pharmacology
    Medicine
    Natural Sciences in General
    Physics
    Keywords:
    Biomass ; Body Size ; Brazil ; Carbohydrate Metabolism ; Carbon/*metabolism ; *Droughts ; Plant Leaves/metabolism ; Plant Stems/metabolism ; *Rainforest ; Seasons ; Soil/chemistry ; Trees/growth & development/*metabolism ; *Tropical Climate ; Water/*metabolism ; Xylem/metabolism
    Published by:
    Latest Papers from Table of Contents or Articles in Press
  2. 2
    Oliveira, R S ; Koskinen, W C ; Ferreira, F A

    Oxford UK : Blackwell Science Ltd
    Published 2001
    Staff View
    ISSN:
    1365-3180
    Source:
    Blackwell Publishing Journal Backfiles 1879-2005
    Topics:
    Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes:
    Sorption of the herbicides alachlor, atrazine, dicamba, hexazinone, imazethapyr, metsulfuron-methyl, nicosulfuron, simazine and sulfometuron-methyl was characterized on six Brazilian soils, using the batch equilibration method. In general, weak acid herbicides (dicamba, imazethapyr, metsulfuron-methyl, nicosulfuron and sulfometuron-methyl) were the least sorbed, whereas weak bases such as triazines and nonionic herbicides (alachlor) were the most sorbed. The Kd values found showed a significant correlation with soil organic carbon content (OC) for all herbicides except imazethapyr and nicosulfuron. Koc values showed a smaller variation among soils than Kd. To estimate the leaching potential, Koc and the ground-water ubiquity score (GUS) were used to calculate half-lives (t1/2) that would rank these herbicides as leachers or non-leachers. Comparison of calculated values to published values for t1/2 demonstrated that sulfonylureas and hexazinone are leachers in all soils, alachlor is transitional, and atrazine, simazine and dicamba are leachers or transitional, depending on soil type. Results discussed in this paper provide background to prioritize herbicides or chemical groups that should be evaluated in field conditions with regard to their leaching potential to ground-water in tropical soils.
    Type of Medium:
    Electronic Resource
    URL:
    Articles: DFG German National Licenses