fertilizers usually enhance potassium (k) content and other naturally occurring radioactive materials in agricultural fields that eventually enter the human food chain through plants. in this study, pot-grown rice plants planted in soil that is relatively high in natural radioactive content was used to estimate the individual influence of fertilizer applications on the uptake of 226ra, 232th, a...

Abstract Key message When competing for nitrogen with other tree species, organic N is more important than inorganic most species Competition (N) in the rhizosphere a key process regulating seedling´s chances growth and survival. However, only few studies have investigated this at individual species´ level when using community approach. In study, 15 incubation experiments were conducted to quan...

Trace gas exchange of N2O, NO/NO2 and CH4 between soil and the atmosphere was measured in a typical Mediterranean pine (Pinus pinaster) forest during two intensive field campaigns in spring and autumn 2003. Furthermore, gross and net turnover rates of N mineralization and nitrification as well as soil profiles of N2O and CH4 concentrations were determined. For both seasons a weak but significan...

Languishing for many years in the shadow of plant inorganic nitrogen (N) nutrition research, studies of organic N uptake have attracted increased attention during the last decade. The capacity of plants to acquire organic N, demonstrated in laboratory and field settings, has thereby been well established. Even so, the ecological significance of organic N uptake for plant N nutrition is still a ...

The rate of N uptake of crops is highly variable during crop development and between years and sites. However, under ample soil N availability, crop N accumulation is highly related to crop growth rate and to biomass accumulation. Critical N concentration has been defined as the minimum N concentration which allows maximum growth rate. Critical N concentration declines during crop growth. The r...

Possible applications of thiophenes in radiopharmaceutical chemistry have been explored. Thiophene for benzene ring substitution was applied to the synthesis of thienyl-[18F]GBR 13119, an analog of the potent and selective dopamine uptake inhibitor [18F]GBR 13119. In vivo regional brain distribution in mice shows essentially identical results for the thienyl and phenyl compounds (striatum/cereb...

Nitrogen (N) management is a promising agronomic strategy to minimize cadmium (Cd) contamination in crops. However, it is unclear how N affects Cd uptake by plants. Wild-type and iron uptake-inefficient tomato (Solanum lycopersicum) mutant (T3238fer) plants were grown in pH-buffered hydroponic culture to investigate the direct effect of N-form on Cd uptake. Wild-type plants fed NO₃⁻ accumulated...

Nitrogen (N) uptake by fine roots of trees is important for understanding root physiological function in forest ecosystems. However, direct investigations situ ammonium and nitrate rates are limited. Thus, we aimed to clarify inorganic N among tree species determine the factors controlling through relationships with traits cool temperate coniferous forests. Using a solution depletion method mea...

The aim of the study was to compare sulfate fertilizers and mixtures elemental sulfur (S0) in terms yield nitrogen (N) (S) status perennial ryegrass. Mixtures S0 can reduce consumption alone. plants were grown soil cultures. supplemented with S0, K2SO4, MgSO4, (NH4)SO4 or a mixture these salts So. Two doses applied ryegrass harvested three times. Fresh dry weights each swath, N S content, their...