There are 10 major or macro nutrients required by plants. Figure
1 contains details of these including their source. In production
soils in South Australia nitrogen, phosphorus and sulphur are often
deficient and need to be manipulated to improve soil productivity.
There are 7 micro nutrients or trace elements that plants
require for growth . These are only required in small amounts but a
deficiency of any trace element in the soil can limit plant growth even
when all other essential elements are present in adequate amounts. In
South Australian soil zinc, manganese and copper are often deficient or
insufficiently available. In acid soils molybdenum availability is reduced
often resulting in crop deficiency.
Total soil content does not necessarily indicate the level
of nutrient available for plant growth.
nutrients, range of soil contents and optimum pH range for availability
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Bureau of South Australia Incorporated, or any of
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