Climate change affect on agriculture in NZ

Climate change affect on agriculture in NZ

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  • Hey dad, do you think Pastoralism will be affected by climate change?
  • Well, it's going to be affecting different areas in different ways. For example, where we are, the cooler, wetter part of the south island; we will benefit from it in some ways.
  • The higher concentration of CO2 in the atmosphere means that there will be an increase in photosynthesis, which allows more sufficient use of available water and improved pasture growth rates
  • Southern South Island
  • Will there be an effect on our crops?
  • So i guess climate change is a good thing then!
  • Well, the higher temperatures will allow earlier sowing of crops and our crops will reach maturity faster (Arable cropping)
  • Pastoralism
  • Well no, other regions around the country will experience droughts meaning they will have a reduced yield in Crops, Pastures etc. 
  • There is also a risk for warmer wetter areas to have increased diseases and problems that favour humid conditions.
  • Particularly in temperate pastures, there is an expected growth of up to 10-20% increase in annual pasture yields, the highest increases are expected in cooler, wetter areas such as the southern south island.
  • We've never had a summer this dry! We have a lower amount of pasture this year
  • Although higher temperatures, depending on snowing time, could lead to a decreased yield, there will be a yield increase in temperate crops like wheat and barley due to the fertilizing effect on higher levels of CO2
  • We've barely had any rain this year. It's probably due to climate change and the increased evaporation that lead to the reduction of rainfall.
  • With the crops that we do have, I've noticed that there is a reduced incidence of diseases that are in favour of humid conditions. 
  • Reduction in productivity could occur in places at risk of droughts, these are mainly Hawke's Bay, Wairarapa, the eastern South Island and Central Otago. Droughts will mean that there will be less rain. The expected increased presence of subtropical grasses would be detrimental in the north.
  • Hawke's Bay
  • Disease problems with maize, such as leaf blights, could be more prevalent in Waikato, where conditions are likely to be warmer and more humid.
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