Farm scale assessment of the impacts of biodiversity enhancement on the financial and environmental performance of mixed livestock farms in New Zealand

2021 ◽  
Vol 187 ◽  
pp. 103007
Author(s):  
Estelle J. Dominati ◽  
Alec D. Mackay ◽  
John M. Rendel ◽  
Andrew Wall ◽  
David A. Norton ◽  
...  
Keyword(s):  
New Zealand ◽  
Environmental Performance ◽  
Scale Assessment ◽  
Farm Scale ◽  
Livestock Farms

Farm-scale assessment of movement patterns and colonization dynamics of the grain aphid in arable crops and hedgerows

2007 ◽  
Vol 9 (4) ◽  
pp. 337-346 ◽  
Author(s):  
Aude Vialatte ◽  
Manuel Plantegenest ◽  
Jean-Christophe Simon ◽  
Charles-Antoine Dedryver
Keyword(s):  
Movement Patterns ◽  
Arable Crops ◽  
Grain Aphid ◽  
Scale Assessment ◽  
Farm Scale ◽  
Colonization Dynamics

scholarly journals SUBDIVISION: BENEFITS AND COSTS

1986 ◽  
pp. 71-75
Author(s):  
J.D. Squire
Keyword(s):  
New Zealand ◽  
Development Stages ◽  
Livestock Farms ◽  
Benefits And Costs

Subdivision is one of the widest used and least researched inputs on livestock farms in New Zealand. Benefits accruing from subdivision in the pasture development stages can be high, however once pastures are developed gams from additional levels may be small. Costs of subdivision have been calculated and are influenced by the size of the property, the number of paddocks and the type of fencing chosen. Keywords: subdivision, pasture development, fencing costs

Estimating nitrous oxide emissions from a dairy farm using a mechanistic, whole farm model and segregated emission factors for New Zealand

Soil Research ◽  
2012 ◽  
Vol 50 (3) ◽  
pp. 188 ◽  
Author(s):  
Iris Vogeler ◽  
Pierre Beukes ◽  
Alvaro Romera ◽  
Rogerio Cichota
Keyword(s):  
Nitrous Oxide ◽  
New Zealand ◽  
Dairy Farm ◽  
Emission Factors ◽  
Nitrous Oxide Emissions ◽  
N2o Emissions ◽  
Nitrification Inhibitors ◽  
Cart Analysis ◽  
Farm Model ◽  
Farm Scale

Nitrous oxide (N2O) emissions from agriculture are generally estimated using default IPCC emission factors (EFs) despite the large variation in measured EFs. We used a classification and regression tree (CART) analysis to segregate measured EFs from direct emissions from urine patches and fertiliser and effluent applications, based on temporal and site-specific factors. These segregated EFs were linked to simulations from the DairyNZ Whole Farm Model to obtain N2O emissions for a typical pasture-based dairy farm in New Zealand. The N2O emissions from urine patches, dung pads, and fertiliser and effluent application, as well as from indirect sources, were aggregated to obtain total N2O emissions for the farm-scale. The results, based on segregated EFs, were compared with those obtained using New Zealand-specific EFs. On-farm N2O emissions based on these segregated EFs were 5% lower than those based on New Zealand-specific EFs. Improved farm management by avoiding grazing, effluent, and N fertiliser application during periods of high risk for N2O emissions, or by the use of mitigation technologies such as nitrification inhibitors, could reduce annual farm scale N2O emissions.

scholarly journals Modelling the farm scale impacts of clover root weevil herbivory

2006 ◽  
Vol 59 ◽  
pp. 312-316 ◽  
Author(s):  
T.A. White ◽  
P.J. Gerard
Keyword(s):  
Computer Simulation ◽  
New Zealand ◽  
N Fixation ◽  
Gross Margin ◽  
Pasture Production ◽  
Pasture Quality ◽  
Sitona Lepidus ◽  
Clover Root ◽  
Farm Scale ◽  
Additional Nitrogen

Clover root weevil (Sitona lepidus CRW) is a major New Zealand pasture pest This study used computer simulation and decision support modelling to simulate CRW herbivory estimate the longterm consequences on clover abundance pasture production and quality and financial implications to a typical sheep and beef farmer Three farm scenarios were explored the absence of CRW and the presence of CRW with and without additional nitrogen (N) For a hypothetical 325 ha Waikato sheep and beef farm CRW decreased mean clover abundance from 21 to 13 pasture production from 9200 to 7900 kg DM/ha/year pasture quality from 105 to 102 MJME/kg DM and N fixation from 60 to 42 kg N/ha/year This resulted in a 16 reduction in the annual gross margin However assuming current prices and costs and that an N response could be consistently achieved urea could be used to replace the reduction in N fixation without affecting profits

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