J2JXRZCZ

2785

15 janvier 2021 10:06

15 janvier 2021 10:06

Incorporating alternative forage species into grazing systems is a potential approach to mitigate N2O emissions, but empirical data to support this is limited. At the organic research farm Lindhof in Northern Germany, we investigated the response of grassland leys containing two to eight species in 2018, and from an irrigated binary mixture in 2019, on N2O emissions from cow excreta patches. N2O emissions were measured using the static chamber method starting immediately after excreta application in spring, summer and autumn and continued for 100 days. The cumulative N2O-N emissions ranged from 0-0.08, 0.04-1.83, 0.23-2.49 kg ha‑1 for the untreated, dung-treated and urine-treated grassland, respectively. The effect of grassland type on N2O emission was only evident in dung-treated patches in spring. This remained true even after irrigating the plots to increase soil moisture to optimal conditions for N2O emission. Despite increments in dung and urine N2O-N emission factor (EF) by 19 and 55%, respectively, this was not significant. The study suggests that other confounding factors might have controlled N2O emissions. The N2O emission factors (EF) were generally much lower than the 2% currently utilised by the IPCC.

None

• AB - Modalité bio
• FREDO adaptation aux changements globaux
• FREDO environnement
• FREDO fourrage et prairie
• GEO Allemagne
• greenhouse gas
• emission
• grassland
• mixture
• perrenial ryegrass

807

10/2020

1 octobre 2020