Long-term Central Waikato summer-autumn rainfall and pasture growth trends. Are conditions for pasture growth changing over time?

نویسندگان

چکیده

Farmers in the upper North Island are concerned about poor productivity of their perennial ryegrass pastures beyond 3 years and suggest this is linked to a trend towards drier conditions for pasture growth during summer autumn. To explore how survival have changed, trends rainfall (measured interpolated; c. 1954 2020), frequency soil moisture deficit stress on (1972-2020), rates (simulated 1977-2020, measured 1979-2020) were compiled summer-autumn months (November April) two Waikato locations: DairyNZ Ruakura/Scott Farm near Hamilton; commercial farm at Paratu Road between Morrinsville Matamata. Significant negative linear observed interpolated (Paratu only), total days (both sites) simulated sites). No significant was either site, suggesting adaptive management has cushioned physical effects harsher climatic conditions. The suite practices adopted described. Analysis decadal patterns indicated greater variability decade 2011-2020 (coefficient variation ranging from 32% 36% depending site data source, versus ~ 22% earlier decades) significantly higher number compared with 1970s 1980s Road. Further adaptation strategies will be needed mitigate these most-recent trends, should they continue as predicted by climate change forecasts.

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ژورنال

عنوان ژورنال: Grassland research and practice series,

سال: 2021

ISSN: ['2463-4751', '0110-8581']

DOI: https://doi.org/10.33584/rps.17.2021.3456