Authors:Laura Ercoli, Alessandro Masoni, Marco Mariotti, and Iduna Arduini
Soil gravel content affects many soil physical properties, i.e. bulk density, porosity, water infiltration and storage, as well as crop yield. Little is known regarding the influence of soil gravel content on grain yield of durum wheat (
Desf.). In this paper the accumulation of dry matter during the vegetative and reproductive periods and the contribution of pre-anthesis assimilates to grain yield have been evaluated in two durum wheat varieties grown on soils with 0, 10, 20, and 30% gravel content. The two varieties showed similar behaviour and more soil gravel decreased plant biomass both at anthesis and at maturity. Soil gravel content greatly reduced grain yield and dry weight of all plant parts both at anthesis and maturity. Post-anthesis dry matter accumulation was 16% lower in plants grown on 30% gravel soil and dry matter remobilization was 53% lower, compared to plants grown in gravel-free soil. The differences in growth rate were attributed to the restriction of the volume of soil available for root growth.
Authors:D. Assinder, J. Hamilton-Taylor, M. Kelly, S. Mudge, and K. Bradshaw
The Esk estuary, U.K. receives inputs of dissolved and particulate plutoniun from discharges of waste into the Irish Sea from the Sellafield nuclear fuel reprocessing plant. Field and laboratory methods have been developed to examine the phenomenon of rapid plutonium remobilization from contaminated Esk sediments during estuarine mixing which was first identified in 1981.Both types of studies have shown comparable, non-conservative behavior for the two oxidation state categories of238Pu and239,240Pu (i.e. Pu (III/IV) and Pu (V/VI)) with enrichment in low salinity waters due to desorption of plutonium from resuspended sediments.
Authors:O. Sedlář, J. Balík, J. Černý, L. Peklová, and K. Kubešová
Bahrani, A., Abad, H.H.S., Aynehband, A. 2011. Nitrogen remobilization in wheat as influenced by nitrogen application and post-anthesis water deficit during grain filling. African J. of Biotechnology 10 :10585
Authors:C. Greis, A. Düker, B. Allard, P. Roos, and E. Holm
Fresh water from Lake Svartsjön, Sweden, was collected and four fractions were prepared: (1) adsorption on DEAE, (2) flocculation
with Ca2+, (3) co-precipitation with Fe hydrous oxide and (4) co-precipitation with Mn hydrous oxide. The plutonium level in the lake
is 65 fg/l (222 μBq/l), measured by ICP-QMS and ICP-SFMS. Pronounced accumulation in fractions (1) (34%) and (2) (66%), combined
with observed levels of organic matter indicate that plutonium is predominantly associated with organic matter. Measurements
of isotopic ratios indicate that 77% of the plutonium originates from weapons testing and the remaining appears to originate
from the Chernobyl accident.
Authors:Norbert Németh, János Földessy, and Judit Turi
Kremikovci and its late diagenetic redeposition may be considered as analogous events to the sedimentary iron accumulation and late diagenetic remobilization of similar age at Rudabánya ( Bodor et al. 2016 ). Kremikovci also has subsequent sulfide