Long-term dynamics of mycorrhizal root tips in a loblolly pine forest grown with free-air CO2enrichment and soil N fertilization for 6 years

2014 ◽  
Vol 20 (4) ◽  
pp. 1313-1326 ◽  
Author(s):  
Seth G. Pritchard ◽  
Benton N. Taylor ◽  
Emily R. Cooper ◽  
Katilyn V. Beidler ◽  
Allan E. Strand ◽  
...  
Keyword(s):  
Loblolly Pine ◽  
N Fertilization ◽  
Pine Forest ◽  
Soil N ◽  
Root Tips ◽  
Mycorrhizal Root ◽  
Free Air

scholarly journals Acclimation of leaf hydraulic conductance and stomatal conductance ofPinus taeda(loblolly pine) to long-term growth in elevated CO2(free-air CO2enrichment) and N-fertilization

2009 ◽  
Vol 32 (11) ◽  
pp. 1500-1512 ◽  
Author(s):  
JEAN-CHRISTOPHE DOMEC ◽  
SARI PALMROTH ◽  
ERIC WARD ◽  
CHRIS A. MAIER ◽  
M. THÉRÉZIEN ◽  
...  
Keyword(s):  
Stomatal Conductance ◽  
Elevated Co2 ◽  
Loblolly Pine ◽  
Hydraulic Conductance ◽  
N Fertilization ◽  
Leaf Hydraulic Conductance ◽  
Free Air

Mycorrhizal and rhizomorph dynamics in a loblolly pine forest during 5 years of free-air-CO2 -enrichment

2008 ◽  
Vol 14 (6) ◽  
pp. 1252-1264 ◽  
Author(s):  
S. G. PRITCHARD ◽  
A. E. STRAND ◽  
M. L. McCORMACK ◽  
M. A. DAVIS ◽  
R. OREN
Keyword(s):  
Loblolly Pine ◽  
Co2 Enrichment ◽  
Pine Forest ◽  
Free Air Co2 Enrichment ◽  
Free Air

Predicting soil nitrogen availability to grain corn in Ontario, Canada

2021 ◽  
Author(s):  
Jessica L. Stoeckli ◽  
Mehdi Sharifi ◽  
David C. Hooker ◽  
Ben W. Thomas ◽  
Froogh Khaefi ◽  
...  
Keyword(s):  
Nitrogen Availability ◽  
Relative Yield ◽  
N Fertilization ◽  
Soil Test ◽  
N Availability ◽  
Soil N ◽  
Fertilizer N ◽  
Soil Nitrogen Availability ◽  
History Of

Predicting the soil available nitrogen (N) to grain corn over a growing season in humid temperate regions is the key for improving fertilizer N recommendations. The objective of this study was to evaluate a suite of soil-N tests to predict soil N availability to grain corn over two growing seasons at 13 individual sites with long-term history of synthetic N fertilization in Ontario, Canada (13 site-years). At each site, fertilizer N was applied at various rates (0-224 kg N ha-1) to determine the crop response to N fertilizer, relative yield (RY) and the most economic rate of N (MERN). Across the entire dataset, water-extractable mineral N (WEMN) was the only soil test that strongly correlated to both RY (r = 0.74**) and MERN (r = -0.56*) indicating that in grain corn fields with long-term history of N fertilization, mineral forms of N in soil solution can be used for fertilizer N recommendations in southern and eastern Ontario. We also provide evidence that grouping soils based on clay content could further refine fertilizer-N recommendations for grain corn in Ontario. A multi-year validation of the WEMN test with more field sites and development of a fertilizer recommendation table for this soil test are recommended.

scholarly journals Long-term N fertilization reduces uptake of N from fertilizer and increases the uptake of N from soil

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Helio Antonio Wood Joris ◽  
André Cesar Vitti ◽  
Risely Ferraz-Almeida ◽  
Rafael Otto ◽  
Heitor Cantarella
Keyword(s):  
N Uptake ◽  
N Fertilization ◽  
N Recovery ◽  
Soil N ◽  
Response Curves ◽  
Current Season ◽  
N Removal ◽  
Sugarcane Yield ◽  
N Management

Abstract Long-term supply of synthetic nitrogen (N) has the potential to affect the soil N processes. This study aimed to (i) establish N response curves to find the best balance between inputs and outputs of N over four ratoons; (ii) use 15N-labeled fertilizer to estimate the N recovery efficiency of fertilizer applied in the current season as affected by the N management in the previous three years. Nitrogen rates (control, 60, 120, and 180 kg ha−1 N) were applied annually in the same plots after the 1st, 2nd, 3rd, and 4th sugarcane cycles. Sugarcane yield, N uptake, and N balance were evaluated. In the final season, 100 kg ha−1 of 15N was also applied in the microplots to evaluate the effect of previous N fertilization on N derived from fertilizer (NDF) and N derived from soil (NDS). Sugarcane yields increased linearly with the N rates over the four sugarcane-cycles. The best balance between the input of N through fertilizer and N removal by stalks was 90 kg ha−1 N in both the 1st and 2nd ratoons, and 71 kg ha−1 N in both the 3rd and 4th ratoons. Long-term application of N reduced NDF from 41 to 30 kg ha−1 and increased NDS from 160 to 180 kg ha−1 N. A key finding is that long-term N fertilization has the potential to affect soil N processes by increasing the contribution of soil N and reducing the contribution of N from fertilizer.

scholarly journals Bermudagrass Management in the Southern Piedmont U.S. IV. Soil Surface Nitrogen Pools

2001 ◽  
Vol 1 ◽  
pp. 673-681 ◽  
Author(s):  
Alan J. Franzluebbers ◽  
John A. Stuedemann
Keyword(s):  
Cynodon Dactylon ◽  
Soil Surface ◽  
N Fertilization ◽  
Organic N ◽  
Soil N ◽  
Crimson Clover ◽  
Total Soil ◽  
Soil N Pools ◽  
Total Soil N

The fate of nitrogen (N) applied in forage-based agricultural systems is important for understanding the long-term production and environmental impacts of a particular management strategy. We evaluated the factorial combination of three types of N fertilization (inorganic, crimson clover [Trifolium incarnatum L.] cover crop plus inorganic, and chicken [Gallus gallus] broiler litter pressure and four types of harvest strategy (unharvested forage, low and high cattle [Bos Taurus] grazing pressure, and monthly haying in summer) on surface residue and soil N pools during the first 5 years of ̒Coastal̓ bermudagrass (Cynodon dactylon [L.] Pers.) management. The type of N fertilization used resulted in small changes in soil N pools, except at a depth of 0 to 2 cm, where total soil N was sequestered at a rate 0.2 g ‧ kg–1‧ year–11 greater with inorganic fertilization than with other fertilization strategies. We could account for more of the applied N under grazed systems (76–82%) than under ungrazed systems (35–71%). As a percentage of applied N, 32 and 48% were sequestered as total soil N at a depth of 0 to 6 cm when averaged across fertilization strategies under low and high grazing pressures, respectively, which was equivalent to 6.8 and 10.3 g ‧ m–2‧ year–1. Sequestration rates of total soil N under the unharvested-forage and haying strategies were negligible. Most of the increase in total soil N was at a depth of 0 to 2 cm and was due to changes in the particulate organic N (PON) pool. The greater cycling of applied N into the soil organic N pool with grazed compared with ungrazed systems suggests an increase in the long-term fertility of soil.

Effects of plant diversity, N fertilization, and elevated carbon dioxide on grassland soil N cycling in a long-term experiment

2013 ◽  
Vol 19 (4) ◽  
pp. 1249-1261 ◽  
Author(s):  
Kevin E. Mueller ◽  
Sarah E. Hobbie ◽  
David Tilman ◽  
Peter B. Reich
Keyword(s):  
Carbon Dioxide ◽  
Plant Diversity ◽  
Elevated Carbon Dioxide ◽  
N Fertilization ◽  
N Cycling ◽  
Soil N ◽  
Grassland Soil ◽  
Term Experiment ◽  
Long Term Experiment

Fine root dynamics in a loblolly pine forest are influenced by free-air-CO2 -enrichment: a six-year-minirhizotron study

2007 ◽  
Vol 14 (3) ◽  
pp. 588-602 ◽  
Author(s):  
SETH G. PRITCHARD ◽  
ALLAN E. STRAND ◽  
M. LUKE McCORMACK ◽  
MICHEAL A. DAVIS ◽  
ADRIEN C. FINZI ◽  
...  
Keyword(s):  
Loblolly Pine ◽  
Fine Root ◽  
Co2 Enrichment ◽  
Pine Forest ◽  
Root Dynamics ◽  
Fine Root Dynamics ◽  
Free Air Co2 Enrichment ◽  
Free Air

Long-term effects of stand density management and genotype on wood properties of loblolly pine (Pinus taeda L.) in the mid-South USA

2021 ◽  
Vol 491 ◽  
pp. 119176
Author(s):  
Michael A. Blazier ◽  
Thomas Hennessey ◽  
Laurence Schimleck ◽  
Scott Abbey ◽  
Ryan Holbrook ◽  
...  
Keyword(s):  
Pinus Taeda ◽  
Loblolly Pine ◽  
Stand Density ◽  
Wood Properties ◽  
Long Term Effects ◽  
Stand Density Management ◽  
Pinus Taeda L

Long-term responses of ecosystem components to stand thinning in young lodgepole pine forest

2006 ◽  
Vol 228 (1-3) ◽  
pp. 69-81 ◽  
Author(s):  
Thomas P. Sullivan ◽  
Druscilla S. Sullivan ◽  
Pontus M.F. Lindgren ◽  
Douglas B. Ransome
Keyword(s):  
Lodgepole Pine ◽  
Pine Forest ◽  
Stand Thinning
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