EFFECTS OF GRAZING ON MICROBIAL FUNCTIONAL GROUPS INVOLVED IN SOIL N DYNAMICS

2005 ◽  
Vol 75 (1) ◽  
pp. 65-80 ◽  
Author(s):  
A. K. Patra ◽  
L. Abbadie ◽  
A. Clays-Josserand ◽  
V. Degrange ◽  
S. J. Grayston ◽  
...  
Keyword(s):  
Functional Groups ◽  
Soil N ◽  
N Dynamics ◽  
Microbial Functional Groups ◽  
Soil N Dynamics

Soil N dynamics in a natural calcareous grassland under a changing climate

1998 ◽  
Vol 27 (3) ◽  
pp. 267-273 ◽  
Author(s):  
N. Jamieson ◽  
D. Barraclough ◽  
M. Unkovich ◽  
R. Monaghan
Keyword(s):  
Calcareous Grassland ◽  
Soil N ◽  
N Dynamics ◽  
Changing Climate ◽  
Soil N Dynamics

Effects of transition season management on soil N dynamics and system N balances in rice–wheat rotations of Nepal

2007 ◽  
Vol 103 (2) ◽  
pp. 98-108 ◽  
Author(s):  
M. Becker ◽  
F. Asch ◽  
S.L. Maskey ◽  
K.R. Pande ◽  
S.C. Shah ◽  
...  
Keyword(s):  
Soil N ◽  
N Dynamics ◽  
Transition Season ◽  
Soil N Dynamics

Relationships between soil nitrogen dynamics and natural 15N abundance in plant foliage from Great Smoky Mountains National Park

1994 ◽  
Vol 24 (8) ◽  
pp. 1636-1645 ◽  
Author(s):  
Charles T. Garten Jr. ◽  
Helga Van Miegroet
Keyword(s):  
N Mineralization ◽  
Enrichment Factors ◽  
High Elevation ◽  
N Availability ◽  
Net N Mineralization ◽  
Soil N ◽  
N Dynamics ◽  
Great Smoky Mountains ◽  
Soil N Dynamics ◽  
Mineral Soils

We tested the hypothesis that naturally occurring nitrogen (N) isotope ratios in foliage (from plants that do not symbiotically fix atmospheric N2) are an indicator of soil N dynamics in forests. Replicate plots were established at eight locations ranging in elevation from 615 to 1670 m in Great Smoky Mountains National Park in eastern Tennessee, U.S.A. The locations selected ranged from N-poor (low-elevation) to N-rich (high-elevation) forest stands. Soils were sampled in June 1992; plants, forest floors, and upper mineral soils were sampled in August 1992. Net N mineralization and net nitrification potentials for surface mineral soils and organic matter layers at each site were determined by aerobic laboratory incubations. Soils and organic layers from high-elevation sites had greater net N mineralization and nitrification potentials than soils from low-elevation sites. There were significant (P ≤ 0.05) differences between study sites in soil 15N abundance. Therefore, we examined correlations between measures of soil N availability and both mean foliar δ15N values and mean enrichment factors (εp−s = δ15Nleaf − δ15Nsoil). In evergreens, maples, and ferns, mean foliar δ15N values and mean enrichment factors were positively correlated with net N mineralization and net nitrification potentials in soil. The observed relationships between natural 15N abundance in plant leaves and soil N availability were explained by a simple model of soil N dynamics. The model predicts how the isotopic composition of plant N is affected by the following factors: (i) varying uptake of soil NH4-N and NO3-N, (ii) the isotopic composition of different soil N pools, and (iii) relative rates of soil N transformations.

Mechanisms of soil N dynamics following long-term application of organic fertilizers to subtropical rain-fed purple soil in China

2015 ◽  
Vol 91 ◽  
pp. 222-231 ◽  
Author(s):  
Jing Wang ◽  
Bo Zhu ◽  
Jinbo Zhang ◽  
Christoph Müller ◽  
Zucong Cai
Keyword(s):  
Organic Fertilizers ◽  
Purple Soil ◽  
Soil N ◽  
N Dynamics ◽  
Soil N Dynamics

Soil N dynamics associated with deforestation, biomass burning, and pasture conversion in a Mexican tropical dry forest

2000 ◽  
Vol 137 (1-3) ◽  
pp. 41-51 ◽  
Author(s):  
L.J. Ellingson ◽  
J.B. Kauffman ◽  
D.L. Cummings ◽  
R.L. Sanford ◽  
V.J. Jaramillo
Keyword(s):  
Biomass Burning ◽  
Tropical Dry Forest ◽  
Dry Forest ◽  
Soil N ◽  
N Dynamics ◽  
Soil N Dynamics ◽  
Pasture Conversion

scholarly journals Nitrogen Availability in Pecan Orchard Soil: Implications for Pecan Fertilizer Management

HortScience ◽  
2011 ◽  
Vol 46 (9) ◽  
pp. 1294-1297 ◽  
Author(s):  
M. Lenny Wells
Keyword(s):  
Nitrogen Availability ◽  
Poultry Litter ◽  
Growing Season ◽  
N Fertilizer ◽  
N Availability ◽  
Soil N ◽  
N Dynamics ◽  
Available N ◽  
Crimson Clover ◽  
Soil N Dynamics

Nitrogen (N) fertilizer application to plants at rates not adjusted for the N contribution from soil N availability may result in overapplication of fertilizer. Further understanding of proper timing of N applications based on soil N dynamics and plant demand can be valuable information for the efficient use of fertilizer N. The present study measures soil N dynamics in a pecan orchard under various N fertilizer regimes on a southeastern U.S. Coastal Plain soil. The following treatments were evaluated: 1) crimson clover (Trifolium incarnatum L.); 2) poultry litter; 3) crimson clover + poultry litter; 4) ammonium nitrate (NH4NO3); and 5) untreated control. Crimson clover provided from 20 to 75 kg·ha−1 N over the course of the two growing seasons; however, most of the available N from crimson clover became available late in the growing season. As a result, supplemental N may be required in spring where crimson clover is used as an orchard cover crop. Poultry litter, with and without clover, provided available N consistently throughout the growing season with more N becoming available later in the season than earlier. This suggests that poultry litter applications for pecan should be timed before budbreak. Under optimum environmental conditions, N from NH4NO3 is most available within the first 30 days of application. Thus, it appears that synthetic fertilizer applications using NH4NO3 as the N source should be targeted at or 2 to 3 weeks after pecan budbreak.

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