Data of slurry quality, soil chemistry and crop yield and composition from a field experiment established 2011 comparing digested and undigested slurry.

The article presents relevant data from a long-term field experiment in Norway, comparing anaerobically digested and undigested slurry from organically managed dairy cows since 2011. Both the undigested and digested slurry originated from the same herd of cows and heifers. The dataset includes chemical analyses of slurry, soil characteristics at plot level of pH, extractable nutrients, and loss on ignition; crop yields, botanical composition (some years), and plant mineral composition (some years).

Data of biomass and N in grass and clover roots, stubbles, and herbage and associated NO and CO emissions, inclusive soil air composition, following autumn ploughing - A field study.

This article presents the detailed data of the soil characteristics, field management, amount and N content of below- (roots +crown) and aboveground (stubble and herbage) grass mixture, red clover and red clover grass swards at the end of the 3rd production year, together with fluxes of greenhouse gas emissions (NO, CO, CH) and soil air composition (CO, NO, CH, N and O) of a field experiment in Norway. These data supplement the findings presented in the research article " Roots and other residues from ley with or without red clover: quality and effects on NO Emission Factor in a partly frozen soil following autumn ploughing"(Bleken et al. 2022).

Roots and other residues from leys with or without red clover: Quality and effects on NO emission factors in a partly frozen soil following autumn ploughing.

Revised IPCC guidelines assume that a constant share of N in decomposing crop residues is directly emitted as NO (emission factor: EF), and calculate the amount of nitrogen (N) in non-removable residues of temporary grasslands proportionally to the average annual herbage yield. However, EF depends on the intrinsic quality of the residues and their interactions with environmental conditions. Only a few field studies on NO emissions from grassland renewal are available, and none have simultaneously quantified the N amount and quality of non-removable residues (roots and stubble).

Soil pH-increase strongly mitigated NO emissions following ploughing of grass and clover swards in autumn: A winter field study.

Emissions from crop residues contribute largely to the total estimated NO emissions from agriculture. Since low soil pH increases NO production by impairing the last denitrification step, liming has been suggested as a mitigation strategy; however, it may also increase NO emissions by enhancing mineralization and nitrification. To gain field-based empirical knowledge, we measured NO fluxes with an autonomous field-flux robot in limed and control plots before and after autumn ploughing of 3-year-old grass, clover grass or red clover swards under different N fertilization regimes.

Predicting field NO emissions from crop residues based on their biochemical composition: A meta-analytical approach.

Crop residue incorporation is a common practice to increase or restore organic matter stocks in agricultural soils. However, this practice often increases emissions of the powerful greenhouse gas nitrous oxide (NO). Previous meta-analyses have linked various biochemical properties of crop residues to NO emissions, but the relationships between these properties have been overlooked, hampering our ability to predict NO emissions from specific residues.