Interpreting Inorganic Nitrogen Soil Tests: Sample Depth, Soil Water, Climate, and Crops

2015 ◽  
pp. 85-98
Author(s):  
C. M. Smith
Keyword(s):  
Soil Water ◽  
Inorganic Nitrogen ◽  
Soil Tests ◽  
Sample Depth

Simulating maize (Zea mays L.) growth and yield, soil nitrogen concentration, and soil water content for a long-term cropping experiment in Ontario, Canada

2014 ◽  
Vol 94 (3) ◽  
pp. 435-452 ◽  
Author(s):  
S. Liu ◽  
J. Y. Yang ◽  
C. F. Drury ◽  
H. L. Liu ◽  
W. D. Reynolds
Keyword(s):  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Inorganic Nitrogen ◽  
Nitrogen Concentration ◽  
Growth And Yield ◽  
Model Data ◽  
Soil Inorganic Nitrogen ◽  
Soil Inorganic

Liu, S., Yang, J. Y., Drury, C. F., Liu, H. L. and Reynolds, W. D. 2014. Simulating maize (Zea mays L.) growth and yield, soil nitrogen concentration, and soil water content for a long-term cropping experiment in Ontario, Canada. Can. J. Soil Sci. 94: 435–452. A performance assessment of the Decision Support Systems for Agrotechnology Transfer (DSSAT) model (v4.5) including the CERES-Maize and CENTURY modules was conducted for continuous maize production under annual synthetic fertilization (CC-F) and no fertilization (CC-NF) using field data from a long-term (53-yr) cropping experiment in Ontario, Canada. The assessment was based on the accuracy with which DSSAT could simulate measured grain yield, above-ground biomass, leaf area index (LAI), soil inorganic nitrogen concentration, and soil water content. Model calibration for maize cultivar was achieved using grain yield measurements from CC-F between 2007 and 2012, and model evaluation was achieved using soil and crop measurements from both CC-F and CC-NF for the same 6-yr period. Good model–data agreement for CC-F grain yields was achieved for calibration (index of agreement, d=0.99), while moderate agreement for CC-NF grain yields was achieved for evaluation (d=0.79). Model–data agreement for above-ground biomass was good (d=0.83–1.00), but the model consistently underestimated for CC-F and overestimated for CC-NF. DSSAT achieved good model–data agreement for LAI in CC-F (d=0.82–0.99), but moderate to poor agreement in CC-NF (d=0.46–0.64). The CENTURY module of DSSAT simulated soil inorganic nitrogen concentrations with moderate to good model–data agreement in CC-F (d=0.74–0.88), but poor agreement in CC-NF (d=0.40–0.50). The model–data agreement for soil water content was moderate in 2007 and 2008 for both treatments (d=0.60–0.76), but poor in 2009 (d=0.46–0.53). It was concluded that the DSSAT cropping system model provided generally good to moderate simulations of continuous maize production (yield, biomass, LAI) for a long-term cropping experiment in Ontario, Canada, but generally moderate to poor simulations of soil inorganic nitrogen concentration and soil water content.

scholarly journals Soil water deficit effects on soil inorganic nitrogen in alternate-furrow flood irrigated Australian cotton production systems

Soil Research ◽  
2021 ◽  
Author(s):  
Ben C. T. Macdonald ◽  
Graeme D. Schwenke ◽  
Annabelle McPherson ◽  
Clarence Mercer ◽  
Jonathan Baird ◽  
...  
Keyword(s):  
Soil Water ◽  
Water Deficit ◽  
Production Systems ◽  
Inorganic Nitrogen ◽  
Soil Water Deficit ◽  
Cotton Production ◽  
Soil Inorganic Nitrogen ◽  
Soil Inorganic

Modelling stream and soil water nitrate dynamics during experimentally increased nitrogen deposition in a coniferous forest catchment at Gårdsjön, Sweden

2009 ◽  
Vol 40 (2-3) ◽  
pp. 187-197
Author(s):  
M. N. Futter ◽  
R. A. Skeffington ◽  
P. G. Whitehead ◽  
F. Moldan
Keyword(s):  
Soil Water ◽  
Stream Water ◽  
Inorganic Nitrogen ◽  
Coniferous Forest ◽  
Water Dynamics ◽  
N Leaching ◽  
N Addition ◽  
Catchment Scale ◽  
Forested Catchments ◽  
N Dynamics

Increased atmospheric deposition of inorganic nitrogen (N) may lead to increased leaching of nitrate (NO3−) to surface waters. The mechanisms responsible for, and controls on, this leaching are matters of debate. An experimental N addition has been conducted at Gårdsjön, Sweden to determine the magnitude and identify the mechanisms of N leaching from forested catchments within the EU funded project NITREX. The ability of INCA-N, a simple process-based model of catchment N dynamics, to simulate catchment-scale inorganic N dynamics in soil and stream water during the course of the experimental addition is evaluated. Simulations were performed for 1990–2002. Experimental N addition began in 1991. INCA-N was able to successfully reproduce stream and soil water dynamics before and during the experiment. While INCA-N did not correctly simulate the lag between the start of N addition and NO3− breakthrough, the model was able to simulate the state change resulting from increased N deposition. Sensitivity analysis showed that model behaviour was controlled primarily by parameters related to hydrology and vegetation dynamics and secondarily by in-soil processes.

scholarly journals Effects of the ridge mulched system on soil water and inorganic nitrogen distribution in the Loess Plateau of China

2018 ◽  
Vol 203 ◽  
pp. 277-288 ◽  
Author(s):  
Rui Jiang ◽  
Xiao Li ◽  
Wei Zhu ◽  
Kun Wang ◽  
Sheng Guo ◽  
...  
Keyword(s):  
Soil Water ◽  
Loess Plateau ◽  
Inorganic Nitrogen ◽  
The Loess Plateau ◽  
Nitrogen Distribution

Uptake regions of inorganic nitrogen in roots of carob seedlings

1995 ◽  
Vol 95 (2) ◽  
pp. 167-175 ◽  
Author(s):  
C. Cruz ◽  
S. H. Lips ◽  
M. A. Martins-Loucao
Keyword(s):  
Inorganic Nitrogen
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