Improved modelling of soil nitrogen losses

2015 ◽  
Vol 5 (8) ◽  
pp. 705-706 ◽  
Author(s):  
Qing Zhu ◽  
William J. Riley
Keyword(s):  
Soil Nitrogen ◽  
Nitrogen Losses

Review: Reducing residual soil nitrogen losses from agroecosystems for surface water protection in Quebec and Ontario, Canada: Best management practices, policies and perspectives

2014 ◽  
Vol 94 (2) ◽  
pp. 109-127 ◽  
Author(s):  
Sogol Rasouli ◽  
Joann K. Whalen ◽  
Chandra A. Madramootoo
Keyword(s):  
Surface Water ◽  
Soil Nitrogen ◽  
Best Management Practices ◽  
Management Practices ◽  
Nitrogen Losses ◽  
Agricultural Fields ◽  
Residual Soil ◽  
Water Protection ◽  
N Losses ◽  
Best Management

Rasouli, S., Whalen, J. K. and Madramootoo, C. A. 2014. Review: Reducing residual soil nitrogen losses from agroecosystems for surface water protection in Quebec and Ontario, Canada: Best management practices, policies and perspectives. Can. J. Soil Sci. 94: 109–127. Eutrophication and cyanobacteria blooms, a growing problem in many of Quebec and Ontario's lakes and rivers, are largely attributed to the phosphorus (P) and nitrogen (N) emanating from intensively cropped agricultural fields. In fact, 49% of N loading in surface waters comes from runoff and leaching from fertilized soils and livestock operations. The residual soil nitrogen (RSN), which remains in soil at the end of the growing season, contains soluble and particulate forms of N that are prone to being transported from agricultural fields to waterways. Policies and best management practices (BMPs) to regulate manure storage and restrict fertilizer and manure spreading can help in reducing N losses from agroecosystems. However, reduction of RSN also requires an understanding of the complex interactions between climate, soil type, topography, hydrology and cropping systems. Reducing N losses from agroecosystems can be achieved through careful accounting for all N inputs (e.g., N credits for legumes and manure inputs) in nutrient management plans, including those applied in previous years, as well as the strategic implementation of multiple BMPs and calibrated soil N testing for crops with high N requirements. We conclude that increasing farmer awareness and motivation to implement BMPs will be important in reducing RSN. Programs to promote communication between farmers and researchers, crop advisors and provincial ministries of agriculture and the environment are recommended.

Biogeochemical Models Relating Soil Nitrogen Losses to Plant-Available N

2001 ◽  
Vol 18 (2) ◽  
pp. 81-89 ◽  
Author(s):  
Ross M. Tabachow ◽  
J. Jeffrey Peirce ◽  
Daniel D. Richter
Keyword(s):  
Soil Nitrogen ◽  
Nitrogen Losses ◽  
Available N ◽  
Biogeochemical Models

scholarly journals Root zone soil nitrogen management to maintain high tomato yields and minimum nitrogen losses to the environment

2010 ◽  
Vol 125 (1) ◽  
pp. 25-33 ◽  
Author(s):  
Tao Ren ◽  
Peter Christie ◽  
Jingguo Wang ◽  
Qing Chen ◽  
Fusuo Zhang
Keyword(s):  
Soil Nitrogen ◽  
Root Zone ◽  
Nitrogen Management ◽  
Nitrogen Losses

Soil nitrogen status 8 years after whole-tree clear-cutting

1995 ◽  
Vol 25 (8) ◽  
pp. 1346-1355 ◽  
Author(s):  
Chris E. Johnson
Keyword(s):  
Organic Matter ◽  
Soil Nitrogen ◽  
Forest Floor ◽  
Large Fraction ◽  
Nitrogen Losses ◽  
Hubbard Brook Experimental Forest ◽  
Forest Clearing ◽  
Clear Cutting ◽  
Nitrogen Concentrations ◽  
Whole Tree

Previous research on chronosequences of even-aged northern hardwood stands has suggested that forest clearing is accompanied by large losses of nitrogen from the forest floor. The timing of the losses and the fate of a large fraction of the lost nitrogen are unclear. The purpose of this investigation was to study these questions through direct measurement of soil nitrogen concentrations and pools through time on an experimental catchment cleared in a whole-tree harvest in 1983–1984. Nitrogen losses from the forest floor at the site, the Hubbard Brook Experimental Forest, New Hampshire, were lower than predictions based on previous research. The mean forest floor nitrogen pool was 17% lower 8 years after clear-cutting of the site (P = 0.18). Predictions based on chronosequence studies suggest that 25–40% of the forest floor nitrogen would be lost after 8 years. Mechanical disturbance during logging may play a role in limiting short-term nitrogen losses. The steep midsection of the catchment experienced the greatest losses of nitrogen and carbon, while pools in the relatively flat spruce-fir zone at the upper elevations were unchanged. Carbon was preferentially lost from soil organic matter, relative to nitrogen, resulting in significant decreases in the C/N and C/organic matter ratios in the soil. The N/organic matter ratio was generally unchanged. Nitrogen losses can be limited after clear-cutting by minimizing organic matter losses and promoting rapid regrowth.

Predicting Nitrogen Losses in Potato Crop with Soil Nitrogen and Plant Tests

2019 ◽  
Vol 111 (5) ◽  
pp. 2493-2503
Author(s):  
Claudia Marcela Giletto ◽  
Nahuel Reussi Calvo ◽  
Hernán Echeverría
Keyword(s):  
Soil Nitrogen ◽  
Potato Crop ◽  
Nitrogen Losses

scholarly journals Relationship of in‐season soil nitrogen concentration with corn yield and potential nitrogen losses

2020 ◽  
Vol 84 (4) ◽  
pp. 1296-1306
Author(s):  
Giovani Preza‐Fontes ◽  
Emerson D. Nafziger ◽  
Laura E. Christianson ◽  
Cameron M. Pittelkow
Keyword(s):  
Soil Nitrogen ◽  
Nitrogen Concentration ◽  
Nitrogen Losses ◽  
Corn Yield ◽  
Relationship Of
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