scholarly journals Plant Nitrogen Dynamics and Nitrogen-use Strategies under Altered Nitrogen Seasonality and Competition

2007 ◽  
Vol 100 (4) ◽  
pp. 821-830 ◽  
Author(s):  
Z. Yuan ◽  
W. Liu ◽  
S. Niu ◽  
S. Wan
Keyword(s):  
Nitrogen Dynamics ◽  
Nitrogen Use ◽  
Plant Nitrogen

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>

scholarly journals Realistic diversity loss and variation in soil depth independently affect community-level plant nitrogen use

Ecology ◽  
2014 ◽  
Vol 95 (1) ◽  
pp. 88-97 ◽  
Author(s):  
Paul C. Selmants ◽  
Erika S. Zavaleta ◽  
Amelia A. Wolf
Keyword(s):  
Soil Depth ◽  
Community Level ◽  
Nitrogen Use ◽  
Plant Nitrogen ◽  
Diversity Loss

Shift in soil–plant nitrogen dynamics of an alpine–nival ecotone

2007 ◽  
Vol 301 (1-2) ◽  
pp. 65-76 ◽  
Author(s):  
Edith Huber ◽  
Wolfgang Wanek ◽  
Michael Gottfried ◽  
Harald Pauli ◽  
Peter Schweiger ◽  
...  
Keyword(s):  
Nitrogen Dynamics ◽  
Plant Nitrogen

Using soil incubations to interpret and predict soil-plant nitrogen dynamics under real field conditions

2016 ◽  
pp. 97-102
Author(s):  
N. Fiorentino ◽  
M. Fagnano ◽  
V. Ventorino ◽  
O. Pepe ◽  
C. Bertora ◽  
...  
Keyword(s):  
Nitrogen Dynamics ◽  
Field Conditions ◽  
Real Field ◽  
Plant Nitrogen

Soil water status influences plant nitrogen use: a case study

2007 ◽  
Vol 301 (1-2) ◽  
pp. 303-313 ◽  
Author(s):  
Zhi-You Yuan ◽  
Ling-Hao Li
Keyword(s):  
Soil Water ◽  
Water Status ◽  
Nitrogen Use ◽  
Plant Nitrogen ◽  
Soil Water Status

scholarly journals miRNAomic Approach to Plant Nitrogen Starvation

2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Peerzada Yasir Yousuf ◽  
Peerzada Arshid Shabir ◽  
Khalid Rehman Hakeem
Keyword(s):  
Nitrogen Starvation ◽  
Regulation Of Gene Expression ◽  
Regulatory Mechanisms ◽  
Nitrogen Use ◽  
Plant Nitrogen ◽  
Environmental Consequences ◽  
Current Review ◽  
N Utilization ◽  
N Metabolism ◽  
Growth Development

Nitrogen (N) is one of the indispensable nutrients required by plants for their growth, development, and survival. Being a limited nutrient, it is mostly supplied exogenously to the plants, to maintain quality and productivity. The increased use of N fertilizers is associated with high-cost inputs and negative environmental consequences, which necessitates the development of nitrogen-use-efficient plants for sustainable agriculture. Understanding the regulatory mechanisms underlying N metabolism in plants under low N is one of the prerequisites for the development of nitrogen-use-efficient plants. One of the important and recently discovered groups of regulatory molecules acting at the posttranscriptional and translational levels are microRNAs (miRNAs). miRNAs are known to play critical roles in the regulation of gene expression in plants under different stress conditions including N stress. Several classes of miRNAs associated with N metabolism have been identified so far. These nitrogen-responsive miRNAs may provide a platform for a better understanding of the regulation of N metabolism and pave a way for the development of genotypes for better N utilization. The current review presents a brief outline of miRNAs and their regulatory role in N metabolism.

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