Production, profit and nitrogen flows in irrigated dairy systems representing different industry development pathways: the Pastoral 21 experience in Canterbury

Future development pathways for irrigated dairy farms in Canterbury operating under stricter nitrogen (N) loss limits were compared in two farmlets over four years. One represented the traditional pathway of intensification via higher inputs of N fertiliser and supplementary feed ('higher input...

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Bibliographic Details
Published in:New Zealand journal of agricultural research 2021-01, Vol.64 (1), p.3-35
Main Authors: Chapman, David F., Dalley, Dawn E., Edwards, Grant R., Cameron, Keith C., Malcolm, Brendon J., Clement, Anna, Romera, Alvaro J., Pinxterhuis, Ina B., Beukes, Pierre C., Di, Hong J., Bryant, Racheal H., Curtis, Jeff
Format: Article
Language:English
Subjects:
Animal fat
Dairy farming
Dairy farms
Dairy systems
environment
Farms
Fertilizers
Industrial development
Irrigation systems
Leaching
Milk
Milk production
nitrate leaching
Nitrogen
nitrogen surplus
Pasture
Proteins
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Summary:Future development pathways for irrigated dairy farms in Canterbury operating under stricter nitrogen (N) loss limits were compared in two farmlets over four years. One represented the traditional pathway of intensification via higher inputs of N fertiliser and supplementary feed ('higher input-high efficiency', HI-HE), while the other represented a lower input pathway using half the amount of N fertiliser and one quarter the amount of supplementary feed ('lower input-high efficiency', LI-HE). The stocking rate of both systems was matched to feed supply to achieve high utilisation (∼90%) of the pasture grown. Mean total annual N surplus and estimated nitrate-N leaching were lower in LI-HE than HI-HE, by 46% and 25% respectively. Milk production was lower for LI-HE (1,700 kg versus 2,240 kg milk fat + protein per ha/year). Estimated profit was the same for both systems at a milk price of $6.46/kg fat + protein, below which LI-HE was more profitable than HI-HE and vice-versa. Compared with the benchmark high-performing Lincoln University Demonstration Dairy Farm (LUDF) through the same period, LI-HE was 2% less profitable, but estimated N leaching was ∼30% lower. Subsequent adoption of the LI-HE system by LUDF demonstrated that the system is scalable, and profitable.
ISSN:0028-8233
1175-8775
DOI:10.1080/00288233.2020.1807367