نتایج جستجو برای: soil nitrate transformation
تعداد نتایج: 428257 فیلتر نتایج به سال:
introduction soil salinity is a major limiting factor in agricultural development within iran. nitrogen is the most important nutrient that its uptake is limited over other elements under saline conditions due to decrease in the permeability of plant roots, soil microbial activity and mineralization of organic compounds and nitrate uptake by high concentrations of chloride anions in the root zo...
Soil bacteria are major players in driving and regulating ecosystem processes. Thus, the identification of factors shaping the diversity and structure of these communities is crucial for understanding bacterial-mediated processes such as nutrient transformation and cycling. As most studies only target the entire soil bacterial community, the response of active community members to environmental...
One of the beneficial roles of riparian buffers is the capacity to attenuate groundwater nitrate before it can discharge to streams. Denitrification is one of the most important processes that permanently removes nitrate from groundwater; it requires anoxic conditions, a carbon source, and a suitable residence time as the reaction is microbially mediated. As denitrification rates are highly dep...
Chlorothalonil is a broad spectrum, non systemic, organochlorine pesticide that was first registered in 1966 for turf grasses, and later for several food crops. Chlorthalonil has both a low Henry's law constant and vapor pressure, and hence, volatilization losses are limited. Although, chlorothalonil's water solubility is low, studies have shown it to be highly toxic to aquatic species. Mammali...
Although nitrogen (N) and phosphorus (P) fertilization are important for maintaining the health productivity of Leymus chinensis steppe, their impact on abundance community structure ammonia-oxidizing bacteria (AOB) archaea (AOA) in this ecosystem is still unclear. We used amoA gene as a molecular marker to monitor changes AOA AOB under low high N P applied resin-core technique measure soil min...
The Root Zone Water Quality Model (RZWQM, V 3.25) was used to simulate the effect of swine manure applications on nitrate-nitrogen (NO3-N) concentrations in subsurface drain water from continuous corn for Iowa soils. Measured values of subsurface drain flow, NO3-N concentrations in drainage water, and residual NO3-N in the soil profile from three chisel plow plots were available for the growing...
In wet soils, low oxygen conditions often develop that favour disease development by many soil-borne plant pathogens. The introduction of a biocontrol agent, to suppress disease development, would require that the agent remains metabolically active under such conditions. Denitrifying bacteria can maintain this metabolic activity by switching to nitrate respiration. In the rhizosphere, plant roo...
Very few principles have been unraveled that explain the relationship between soil properties and soil biota across large spatial scales and different land-use types. Here, we seek these general relationships using data from 52 differently managed grassland and forest soils in three study regions spanning a latitudinal gradient in Germany. We hypothesize that, after extraction of variation that...
Comparative effects of partial root-zone irrigation (PRI) and deficit irrigation (DI) on xylem pH, ABA, and ionic concentrations of tomato (Lycopersicon esculentum L.) plants were investigated in two split-root pot experiments. Results showed that PRI plants had similar or significantly higher xylem pH, which was increased by 0.2 units relative to DI plants. Nitrate and total ionic concentratio...
Fertilised cropland is a potential non-point source of nitrogen contributing to the nutrient enrichment of surface water ecosystems. Nitrogen is present in drainage outflow primarily because of the addition of fertilisers. The purpose of this study is to model the nitrate leaching to surface waters using a quasi twodimensional mechanistic flow model (DRAINMOD) in combination with a GIS. The GIS...
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