Sustainability of beef production from brigalow lands after cultivation and mining. 1. Sown pasture growth and carrying capacity
نویسندگان
چکیده
Context New Acland coal mine in south-eastern Queensland is seeking to rehabilitate mined land pastures that are safe, stable and sustainable for beef production. Little known of the productivity sustainability grazing previously Darling Downs study region. Additionally, information required specify management guidelines regional types retired from cultivation. Aims Identify pasture growth characteristics, rainfall use efficiencies long-term carrying capacities subtropical sown established on lands rehabilitated after open-cut mining comparison un-mined but cultivated lands. Methods Pasture quality (% nitrogen) were observed using Swiftsynd methodology ungrazed exclosures with three sites Grazing Trial over a 5-year period (2014–2018), 13 unmined periods 2–5 years providing data modelling growth. Key results Peak yield (TSDM autumn harvests) averaged 2017 2018 was greater (P < 0.1) than Poplar Box type (5957 2233 kg/ha respectively) similar Brigalow Uplands Mountain Coolibah (3946 3413 respectively). rundown evident, N uptake decreasing 5 at some sites. Soil mineral supply (potentially mineralisable N) spring useful indicator following growing season. Simulations GRASP model trial predicted 12.0, 7.0, 9.1 4.8 kg/ha.mm Uplands, respectively. Long-term based estimates median 30% utilisation 4.39, 3.58 5.92 ha/adult equivalent respectively types, 2.45 Conclusions Rehabilitated can be as productive land. Implications plans developed present study. The will assist transition commercial agriculture.
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ژورنال
عنوان ژورنال: Animal Production Science
سال: 2021
ISSN: ['1836-5787', '1836-0939']
DOI: https://doi.org/10.1071/an20135