Simulation models can be used to predict N dynamics in a soil-water-plant system. The simulation accuracy and performance of three models: LEACHM (Leaching Estimation And CHemistry Model), NCSWAP (Nitrogen and Carbon cycling in Soil, Water And Plant), and SOILN to predict NO3-N leaching were evaluated and compared to field data from a 5-yr experiment conducted on a Hagerstown silt loam (fine, m...

Chemical nitrogen (N) fertilizers are regarded as one of the environmental contaminants in addition to necessity for fossil sources their production. Conversely, it is impossible neglect supply needed essential ingredients plant function. For organic agriculture, crucial use alternative fertilizer management reduce harmful impacts and production costs chemical fertilizers. In a one-year pot exp...

Nitrogen (N) fertilizer management in agricultural field affects soil N budget that can have significant implication greenhouse gas emission and environmental pollution. This study investigates the effects of nitrification inhibitors Dicyandiamide (DCD) 3,4-dimethyl pyrazole phosphate (DMPP) with urea application on microbial community a subtropical pasture field. A experiment consisting four t...

Accurate descriptions of P leaching are important because excess P applied to soils can enter surface water via leaching and subsurface transport, thereby negatively impacting water quality. The objectives of this study were to monitor P leaching in soils with a long-term history of waste application, relate soil solution P concentrations to soil P status, and quantify P leaching losses. Soil s...

Drainage and deforestation turned Southeast (SE) Asian peat soils into a globally important CO2 source, because both processes accelerate peat decomposition. Carbon losses through soil leaching have so far not been quantified and the underlying processes have hardly been studied. In this study, we use results derived from nine expeditions to six Sumatran rivers and a mixing model to determine l...

Leaching of NO3-N from agricultural lands often occurs in well-defined hot spot areas when viewed across geographical regions of hundreds or thousands of km 2 and often appears as areas of high NO3-N concentrations in shallow underlying aquifers. Delineation of high-NO3-N zones can be achieved by combining models such the Nitrate Leaching and Economic Analysis Package (NLEAP) with Geographical ...

Availability and leaching of dissolved inorganic N (DIN = NH4 + NO3) in soil were measured in a periodically flooded forest of the Central Amazon floodplain (v rzea) during one terrestrial phase. Special emphasis was on the effects of a legume and a nonlegume tree species. NH4-N accounted for more than 85% of DIN even at the end of the terrestrial phase although it decreased throughout the expe...

A new empirical nitrogen (N) leaching model was applied at detailed agricultural data at field level, obtained from a questionnaire survey including two small catchments. Getting agricultural data from two public electronic registers concerning the 592 km Mariager Fjord catchment, the leaching results were extrapolated from the two reference catchments to the Mariager Fjord catchment, data grou...

Elevated nitrate concentrations in ground water can be a problem in agricultural areas, especially where soils are sandy. Tillage operations, such as ridge tillage (RT) and no tillage (NT) can reduce runoff and erosion but leaching of soluble nutrients could adversely impact groundwater. In a 2-year study, Br was used to trace the effects of fertilizer placement on solute movement under corn (Z...