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Nitrous oxide emissions from dairy farm effluent applied to a New Zealand pasture soil
Author(s) -
Li J.,
Luo J.,
Shi Y.,
Lindsey S.,
Houlbrooke D.,
Ledgard S.
Publication year - 2015
Publication title -
soil use and management
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.709
H-Index - 81
eISSN - 1475-2743
pISSN - 0266-0032
DOI - 10.1111/sum.12187
Subject(s) - effluent , pasture , nitrous oxide , manure , environmental science , agronomy , nitrification , zoology , manure management , growing season , nitrogen , chemistry , biology , environmental engineering , ecology , organic chemistry
A field experiment on permanent ryegrass–white clover pasture at AgResearch's Ruakura dairy farm near Hamilton, New Zealand quantified nitrous oxide (N 2 O) emissions from different types of dairy effluent applied to soil at three seasons and evaluated the potential of dicyandiamide ( DCD ) (a nitrification inhibitor) to decrease gaseous N 2 O emissions. Fresh or stored manure and farm dairy effluent ( FDE ; from dairy shed washings), with or without DCD (10 kg/ha), were applied at approximately 100 kg N/ha to plots on a well‐drained soil on volcanic parent material. A field chamber technique was used to measure N 2 O emissions. Application of manure or FDE , both in fresh and stored forms, to pasture generally increased N 2 O emissions. Overall N 2 O emission factors ( EF ) varied between 0.01% and 1.87%, depending on application season and effluent type. EF s in spring and autumn were greater than those in summer ( P < 0.05). Among the effluents, N 2 O EF s were largest from fresh FDE (1.65%) during the spring measurement period, stored manure (1.87%) during the autumn and stored FDE (0.25%) during the summer. DCD was effective in decreasing N 2 O EF s from fresh FDE , fresh manure, stored FDE and stored manure by 40–80%, 69–76%, 24–84% and 60–70%, respectively. DCD reduced N 2 O emissions during the spring and autumn seasons more effectively than in the summer season.