Measuring and Modeling Solute Transport through the Root Zone at the Ohio Management Systems Evaluation Areas

2013 ◽  
Author(s):  
Andy Ward ◽  
Steve Workman ◽  
Joan Wu ◽  
Norm Fausey ◽  
Scott Bair ◽  
...  
Keyword(s):  
Solute Transport ◽  
Root Zone ◽  
Management Systems

scholarly journals Nitrate and ammonium in soil solution in tobacco management systems

2010 ◽  
Vol 34 (2) ◽  
pp. 379-388 ◽  
Author(s):  
Douglas Rodrigo Kaiser ◽  
Dalvan José Reinert ◽  
José Miguel Reichert ◽  
Carlos Arnoldo Streck ◽  
André Pellegrini
Keyword(s):  
Soil Solution ◽  
Root Zone ◽  
Porous Ceramic ◽  
Conventional Tillage ◽  
Management Systems ◽  
Ammonium Concentration ◽  
Environmental Attributes ◽  
Nitrate Concentrations ◽  
Crop Cycle ◽  
Npk Fertilizer

Tobacco farmers of southern Brazil use high levels of fertilizers, without considering soil and environmental attributes, posing great risk to water resources degradation. The objective of this study was to monitor nitrate and ammonium concentrations in the soil solution of an Entisol in and below the root zone of tobacco under conventional tillage (CT), minimum tillage (MT) and no-tillage (NT). The study was conducted in the small-watershed Arroio Lino, in Agudo, State of Rio Grande do Sul, Brazil. A base fertilization of 850 kg ha-1 of 10-18-24 and topdressing of 400 kg ha-1 of 14-0-14 NPK fertilizer were applied. The soil solution was sampled during the crop cycle with a tension lysimeter equipped with a porous ceramic cup. Ammonium and nitrate concentrations were analyzed by the distillation and titration method. Nitrate concentrations, ranging from 8 to 226 mg L-1, were highest after initial fertilization and decreased during the crop cycle. The average nitrate (N-NO3-) concentration in the root zone was 75 in NT, 95 in MT, and 49 mg L-1 in CT. Below the root zone, the average nitrate concentration was 58 under NT, 108 under MT and 36 mg L-1 under CT. The nitrate and ammonium concentrations did not differ significantly in the management systems. However, the nitrate concentrations measured represent a contamination risk to groundwater of the watershed. The ammonium concentration (N-NH4+) decreased over time in all management systems, possibly as a result of the nitrification process and root uptake of part of the ammonium by the growing plants.

scholarly journals Estimating soil nutrient index vis-a-vis mango orchard productivity of Lucknow region, Uttar Pradesh, India

2020 ◽  
Vol 7 (3) ◽  
pp. 622-626
Author(s):  
Tarun Adak ◽  
◽  
G. Pandey ◽  
Keyword(s):  
Root Zone ◽  
Uttar Pradesh ◽  
Soil Nutrient ◽  
Management Systems ◽  
Productivity Analysis ◽  
Nutrition Management ◽  
Lower Productivity ◽  
Nutrient Index ◽  
Zone Depth ◽  
Orchard Soils

Soil nutrient index was developed in mango orchard soils for which a sum of 88 soil samples were recently collected from the root zone depth (0–30 cm) of 22 fixed mango orchards of Lucknow region of Uttar Pradesh, India. Analysis of data indicated orchards had wider contents in nutrients in soil and foliar parts. Developed soil nutrient index concluded that mango orchard soils were categorized as low SOC, N and K, whereas P designated in medium rating. In case of available micronutrients, Zn, Fe and Mn falls under medium rating while Cu in low rating. Productivity analysis showed 4.92 to 8.68 t ha-1 with majority of the orchards had production from 6 to ≤8.0 t ha-1. Such lower productivity is linked to low to medium soil nutrients. The study showed for ensuring better productivity, proper nutrition management systems should be adopted by the growers.

Field and numerical study of solute transport under evaporation in a subtropical tidal wetland

2021 ◽  
Author(s):  
Yue Liu ◽  
Chenming Zhang ◽  
Xiaocheng Liu ◽  
Ling Li ◽  
Alexander Scheuermann ◽  
...  
Keyword(s):  
Solute Transport ◽  
Transport Model ◽  
Root Zone ◽  
Numerical Study ◽  
Soil Surface ◽  
Distribution Patterns ◽  
Tidal Wetland ◽  
Wetland Ecology ◽  
Salt Distribution ◽  
The Impact

<p>Tidal wetlands are critical intertidal ecosystem which accommodates a large range of flora and fauna species. The intertidal subsurface environment is subjected to continuous groundwater-seawater mixing which results in dynamic solute transport in the aquifer and to the ocean. Salt distribution and transport play a vital role in the wetland ecology and near-shore biogeochemical activities. While many field and simulation studies have been presented to characterize the salt distribution in the intertidal beach aquifer under the influence of tidal inundation, salt distribution in the tidal wetland subsurface system yet requires more investigation. Moreover, the impact of evaporation on porewater salt distribution could be essential in subtropical areas with numerous coastal wetlands as evaporation extracts porewater from the soil surface and leaves salt in the surface and wetland root zone. However, this parameter was commonly ignored by previous studies.</p><p>In this study, field monitoring was carried out to map the groundwater level and spatial salt distribution in a subtropical wetland located in Southeastern Queensland, Australia. Two dimensional, variable-density, saturated-unsaturated groundwater flow and solute transport model was used to examine the pore water flow and salt distribution patterns in a cross-shore section of the field site under the influences of the spring-neap tide and evaporation. Field and simulation results consistently showed that salinity is greatly impacted by evaporation and showed different distributions from the saline seawater intrusion patterns displayed by most of the former studies. </p>

Ferrihydrite dissolution at the root zone of crops under semi-arid condition controls the plant uptake of uranium and arsenic

2020 ◽  
Author(s):  
Arindam Malakar ◽  
Michael Kaiser ◽  
Daniel D. Snow ◽  
Harkamal Walia ◽  
Chittaranjan Ray
Keyword(s):  
Plant Uptake ◽  
Root Zone ◽  
Arid Condition ◽  
Semi Arid
Sign in / Sign up

Export Citation Format

Share Document