Control of Plant Nitrogen Uptake in Native Ecosystems by Rhizospheric Processes

2008 ◽  
pp. 71-93 ◽  
Author(s):  
Vincent Gutschick ◽  
Hormoz BassiriRad ◽  
Harbans Sehtiya
Keyword(s):  
Nitrogen Uptake ◽  
Plant Nitrogen ◽  
Plant Nitrogen Uptake

A computational history and outlook of nitrogen use efficiency and precipitation-optimal fertilisation timings in agriculture

2021 ◽  
Author(s):  
Daniel McKay Flecher ◽  
Siul Ruiz ◽  
Tiago Dias ◽  
Katherine Williams ◽  
Chiara Petroselli ◽  
...  
Keyword(s):  
Soil Moisture ◽  
Nitrogen Uptake ◽  
Nitrogen Use Efficiency ◽  
Nitrogen Efficiency ◽  
Nitrogen Use ◽  
Plant Nitrogen ◽  
Nitrogen Fertilisation ◽  
Plant Nitrogen Uptake ◽  
Use Efficiency ◽  
Rainfall Patterns

<p>Half of the nitrogen applied to arable-fields is lost through several processes linked to soil moisture. Low soil moisture limits nitrogen mobility reducing nitrogen-uptake while wetter conditions can increase nitrogen leaching. Rainfall ultimately governs soil moisture and the fate of nitrogen in soil. However, the interaction between rainfall and nitrogen use efficiency (NUE) remains poorly understood.</p> <p>We developed a field-scale modelling platform that describes coupled water and nitrogen transport, root growth and uptake, rainfall, the nitrogen-cycle and leaching to assess the NUE of split fertilisations with realistic rainfall patterns. The model was solved for every possible split fertilisation timing in 200+ growing seasons to determine optimal timings. Two previous field trials regarding rainfall and NUE had contrasting results: wetter years have enhanced fertiliser loss and drier years reduced plant nitrogen uptake. By choosing appropriate fertilisation timings in the model we could recreate the two contrasting trends and maintain variability in the data. However, we found by choosing other fertilisation timings we could mitigate the leaching in wetter years. Optimised timings could increase plant nitrogen uptake by up to 35% compared to the mean in dry years. Plant uptake was greatest under drier conditions due to mitigated leaching, but less likely to occur due to low nitrogen mobility. Optimal fertilisation timings varied dramatically depending on the rainfall patterns. Historic and projected rainfall patterns from 1950-2069 were used in the model. We found optimal NUE has a decrease from 2022-2040 due to increased heavy rainfall events and optimal fertilisation timings are later in the season but varied largely on a season-to-season basis.</p> <p>The results are a step towards achieving improved nitrogen efficiency in agriculture by using the ‘at the right time’ agronomic-strategy in the ‘4Rs’ of improved nitrogen fertilisation. Our results can help determine nitrogen fertilisation timings in changing climates.</p>

Current Status and Future Needs in Modeling Plant Nitrogen Uptake: A Preface

2008 ◽  
pp. 1-12
Author(s):  
Liwang Ma ◽  
Lajpat R. Ahuja ◽  
Thomas W. Bruulsema
Keyword(s):  
Nitrogen Uptake ◽  
Current Status ◽  
Plant Nitrogen ◽  
Future Needs ◽  
Plant Nitrogen Uptake

scholarly journals Effects of biochar application on soil nitrogen transformation, microbial functional genes, enzyme activity, and plant nitrogen uptake: a meta‐analysis of field studies

GCB Bioenergy ◽  
2021 ◽  
Author(s):  
Leiyi Zhang ◽  
Yiming Jing ◽  
Chengrong Chen ◽  
Yangzhou Xiang ◽  
Mehran Rezaei Rashti ◽  
...  
Keyword(s):  
Enzyme Activity ◽  
Soil Nitrogen ◽  
Nitrogen Uptake ◽  
Meta Analysis ◽  
Field Studies ◽  
Nitrogen Transformation ◽  
Functional Genes ◽  
Plant Nitrogen ◽  
Plant Nitrogen Uptake

Nitrate Losses From Disturbed Forests: Patterns and Mechanisms

1979 ◽  
Vol 25 (4) ◽  
pp. 605-619 ◽  
Author(s):  
Peter M. Vitousek ◽  
Jerry M. Melillo
Keyword(s):  
Nitrogen Mineralization ◽  
Nitrogen Uptake ◽  
Plant Uptake ◽  
Drainage Water ◽  
Nitrate Transport ◽  
Plant Nitrogen ◽  
Nitrate Losses ◽  
Wide Range ◽  
Plant Nitrogen Uptake ◽  
Disturbed Forest

Abstract Losses of nitrate in drainage water from disturbed forest ecosystems vary over a wide range. High losses of nitrate to streamwater or groundwater have been observed in a few sites, while in others only small increases in losses have occurred. A limited set of mechanisms could be responsible for such differences. Before disturbance, annual nitrogen mineralization and plant nitrogen uptake vary widely among temperate forests, with higher rates observed in deciduous forests. Destructive disturbance increases nitrogen mineralization and (at least briefly) reduces plant uptake. The nitrogen mineralized in excess of plant uptake could be lost to streamwater or groundwater, lost to the atmosphere through ammonia volatilization or denitrification, or retained within the disturbed system through nitrogen immobilization by decomposers, clay fixation of ammonium, lags in nitrification, nitrate reduction to ammonium, nitrate adsorption on soil colloids, a lack of water for nitrate transport, or (once plant regrowth is established) plant nitrogen uptake. Systematic studies of these mechanisms will allow the development of a more thorough understanding of the nitrogen cycle in disturbed ecosystems. Such an understanding should in turn permit the prediction of nitrate losses from distrubed forests. Forest Sci. 25:605-619.

Optimization of Dynamic Plant Nitrogen Uptake, Using Apriori Information of Plant Nitrogen Content

1997 ◽  
Vol 39 (6) ◽  
pp. 707-718 ◽  
Author(s):  
A. Vold ◽  
J. S. Sôreng
Keyword(s):  
Nitrogen Content ◽  
Nitrogen Uptake ◽  
Plant Nitrogen ◽  
Dynamic Plant ◽  
Plant Nitrogen Uptake

Simulated Soil Water Content Effect on Plant Nitrogen Uptake and Export for Watershed Management

2008 ◽  
pp. 277-304
Author(s):  
Gary Shenk ◽  
Ali Sadeghi ◽  
Jeff Arnold ◽  
Lewis Linker ◽  
Ping Wang ◽  
...  
Keyword(s):  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Watershed Management ◽  
Nitrogen Uptake ◽  
Plant Nitrogen ◽  
Plant Nitrogen Uptake
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