Process rates of nitrogen cycle in uppermost topsoil after harvesting in no-tilled and ploughed agricultural clay soil

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http://hdl.handle.net/10138/309858

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Laine , M P P , Rütting , T , Alakukku , L E , Palojärvi , A & Strömmer , R H 2018 , ' Process rates of nitrogen cycle in uppermost topsoil after harvesting in no-tilled and ploughed agricultural clay soil ' , Nutrient Cycling in Agroecosystems , vol. 110 , no. 1 , pp. 39-49 . https://doi.org/10.1007/s10705-017-9825-2

Title: Process rates of nitrogen cycle in uppermost topsoil after harvesting in no-tilled and ploughed agricultural clay soil
Author: Laine, Merjo Piia Päivikki; Rütting, Tobias; Alakukku, Laura Elina; Palojärvi, Ansa; Strömmer, Rauni Hannele
Other contributor: University of Helsinki, Environmental Sciences
University of Helsinki, Department of Agricultural Sciences
University of Helsinki, Environmental Sciences



Date: 2018-01-20
Language: eng
Number of pages: 11
Belongs to series: Nutrient Cycling in Agroecosystems
ISSN: 1385-1314
DOI: https://doi.org/10.1007/s10705-017-9825-2
URI: http://hdl.handle.net/10138/309858
Abstract: No-till is considered an agricultural practice beneficial for the environment as soil erosion is decreased compared to ploughed soils. For on overall evaluation of the benefits and disadvantages of this crop production method, understanding the soil nutrient cycle is also of importance. The study was designed to obtain information about gross soil nitrogen (N) process rates in boreal no-tilled and mouldboard ploughed spring barley (Hordeum vulgare L.) fields after autumn harvesting. In situ soil gross N transformation process rates were quantified for the 5 cm topsoil in 9 days' incubation experiment using N-15 pool dilution and tracing techniques and a numerical N-15 tracing model. Gross N mineralization into ammonium (NH4+) and NH4+ immobilization were the most important N transformation processes in the soils. The gross mineralization rate was 14% and NH4+ immobilization rate 64% higher in no-till than in ploughing. Regardless of the faster mineralization, the gross rate of NH4+ oxidation into nitrate (NO3-) in no-till was one order of magnitude lower compared the ploughing. The results indicate that the no-tilled soils have the potential to decrease the risk for NO3- leaching due to slower NH4+ oxidation.
Subject: 1172 Environmental sciences
4111 Agronomy
Soil management
Zero tillage
Conventional tillage
Nitrate
Gross rate
Stable isotope
Agriculture
GREENHOUSE-GAS FLUXES
LONG-TERM
TILLAGE SYSTEMS
FIELD EXPERIMENT
DETERMINING N-15
ARABLE SOILS
CROP
CARBON
N2O
TRANSFORMATIONS
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