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NANORP West: WA trials highlight nitrogen flipside

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National Agricultural Nitrous Oxide Research Program (NANORP) research in WA was all about seeing if increasing SOC created an N 2 O problem... For WA grower Stuart McAlpine, the findings of NANORP trials looking at tilled sandy soils on his 5000ha property at Buntine showed yields were unaffected by nitrogen fertiliser applications, leading him to explore the potential for increased soil organic carbon to reduce applied nitrogen costs without resulting in yield penalties... NANORP research has found that sandy soils emit N 2 O in fallow periods, and Joe says this knowledge supports their on-farm practice of planting opportunity summer-grazing crops such as millet, sorghum and perennial ryegrass to improve SOC and provide feed for sheep...