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Report2021

Effects of crop residue vertical distribution, temperature, moisture and freeze-thaw on N2O/CO2 emissions

Ernfors, Maria; Petersen, S.O.; Taghizadeh-Toosi, Arezoo; Chandra, V.; Massad, R.S.; Laville, P.; Jensen, Erik Steen; Lashermes, G.; Janz, B.; Butterbach-Bahl, K.; Loubet, B.; Olesen, Jørgen E.

Abstract

Three main incubation studies were conducted to identify how management, residue properties and soil properties, alone or in interaction, affect N2O emissions. The aim was to contribute to improving both inventories and mitigation strategies. Treatments used in various combinations were: residue type, vertical residue distribution, fertilization, soil moisture, soil type and freezing/thawing. The results showed clearly that several factors interact to determine the magnitude of N2O emissions after addition of residues to soil. We conclude that inventories should ideally integrate other factors than the total amount of N added with the residues and also take into account the effects of combinations of factors. Although the mechanisms behind N2O emissions are complex, the results pointed to combinations of residue type, management, soil type and season that create particularly high risks of N2O emissions, and field situations representing such combinations could be targeted for mitigation.

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Publisher: ResidueGas