Year 7-10 Agriculture

Salinity

Salinity is the saltiness, or dissolved salt content, of water or soil and is a general term used to describe the presence of elevated levels of salts. These salts include:

  • Chloride
  • Sodium
  • Magnesium
  • Calcium sulphates and bicarbonates

There are three main types of salinity. These are:

  • Irrigation Salinity– This occurs when water is overused for irrigation causing rising water tables.
  • Dryland Salinity– This occurs when salt water seeps scald the surface of land that is not irrigated, which then affects plant growth and severely degrades the soil structure.
  • Saltwater Intrusion – This occurs in coastal aquifer systems when sea water replaces groundwater that has been overused and depleted.

Where and how salinity occurs depends on several factors. The main factors which are the most important to remember are:

  • The climate of the area
  • How humans have affected the area (clearing, housing etc…)
  • The characteristics of the landscape (bush type and density, river systems etc…)

Outcomes

Year 9

ACHGK063  The challenges to food production, including land and water degradation, shortage of fresh water, competing land uses, and climate change, for Australia and other areas of the world

ACHGK064  The capacity of the world’s environments to sustainably feed the projected future population to achieve food security for Australia and the world

ACHGS071  Reflect on and evaluate the findings of the inquiry to propose individual and collective action in response to a contemporary geographical challenge, taking account of environmental, economic and social considerations; and explain the predicted outcomes and consequences of their proposal

Year 10

ACHGK070  The human-induced environmental changes that challenge sustainability

ACHGS080  Reflect on and evaluate the findings of the inquiry to propose individual and collective action in response to a contemporary geographical challenge, taking account of environmental, economic and social considerations; and explain the predicted outcomes and consequences of their proposal

ACDSEH125   The intensification of environmental effects in the twentieth century as a result of population increase, urbanisation, increasing industrial production and trade